FIELD OF THE INVENTION

The present disclosure, in general, relates to the Internet of Things (IoT) based automation and more particularly, to a device and a method for converting a conventional induction motor ceiling fan to an Intelligent ceiling fan.

BACKGROUND OF THE INVENTION

Conventional induction motor or Brushless DC (BLDC) motor based ceiling fans are controlled by wall mounted switch or wall mounted fan regulator where a user has to provide input repeatedly without considering the environmental conditions, causing inconvenience to the user. Most of the existing prior art, tried to solve the aforementioned problem by developing an inbuilt electronic control unit based ceiling fan to be controlled wirelessly through mobile applications or remote control kit. As the electronic control module forms an integral part, the user has to replace the existing conventional ceiling fans completely to experience the facilities offered by these automatic ceiling fans. These prior art focussed on the development of BLDC motor based ceiling fan. However, the biggest market is for induction motor ceiling fan for which there is no any automatic controls available.
[003] In the present scenario, aging populations and increasing energy costs are driving the development of IoT enabled automation and smart appliances with inbuilt control circuitry. However, the user has to bear the replacement cost for the new appliances based on IoT. Also, the recycling of such traditional devices has to be taken into consideration. In addition to that, the IoT based appliances having inbuilt hardware specifically designed for smart control do not have backward compatibility, thereby limiting the flexibility in the operation of the corresponding appliances when out of order or in fault conditions.
[004] Therefore, there is a need to develop a device which can be installed on the induction motor based ceiling fan to convert it into a smart IoT ceiling fan without replacing the conventional fans completely and regulate as per user’s requirement flexibly.
OBJECT OF THE INVENTION
[005] It is therefore an object of the present invention, to solve the aforementioned and other drawbacks existing in the conventional ceiling fans.
[006] Another primary object of the present invention is to convert any conventional induction motor ceiling fan to IoT based intelligent ceiling fan.
[007] Yet another objective of the present invention is to install the retrofit device in top canopy of the ceiling fan.
[008] Yet another object of the present invention is to connect the existing induction motor ceiling fan with retrofit device by on four numbers of wires out of which two wires are provided to receive input from power supply and the remaining two wires to provide output to the motor.
[009] Yet another object of the present invention is to control the ceiling fan by mobile application which can be downloaded from the internet and remote control.
[0010] Still another object of the present invention is to control the ceiling fan by temperature and humidity sensor which are incorporated in retrofit device.
[0011] Yet another object of the present invention is to regulate the speed of the ceiling fan on the basis of indoor environmental conditions such as room temperature and humidity.
[0012] Yet another object of the present invention is to regulate the ceiling fan through voice controlled devices like Alexa or Google Home or Siri.
[0013] Yet another object of the present invention is for grouping of the ceiling fans to enable simultaneous control of multiple ceiling fans in one command.
[0014] Yet another object of the present invention is to allow multiple users to control a ceiling Fan via mobile based applications wirelessly.
[0015] Yet another objective of the present invention is to control the ceiling fan through mobile based applications either on station mode or on cloud mode.
[0016] Yet another objective of the present invention is to develop a unique smart heat index algorithm to regulate the speed of the ceiling fan on basis of temperature & humidity.
[0017] Further object of the present invention is to display room temperature and humidity in mobile application and on the bottom side of the ceiling fan.
SUMMARY OF THE INVENTION
[0018] One or more drawbacks of conventional ceiling fans, and additional advantages are provided through a retrofit device which converts the conventional ceiling fan into IoT based smart ceiling fans and a method of its fitment as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be a part of the claimed disclosure.
[0019] The present invention relates to an IoT based retrofit device to convert any induction motor ceiling fan to intelligent fan which can be controlled through mobile application, voice controlled devices, remote control etc. The retrofit device can directly be installed on the top of canopy of the ceiling fan with two input wires from power supply and two output wires to the fan. The converted intelligent ceiling fan can be operated in station mode as well as in cloud mode. The device is also having the temperature and humidity sensor to sense the environmental conditions of room. The device is programmed with unique heat index algorithm through which the device is enabled to regulate the speed of the ceiling fan on the basis of room environment for user comfort. Plurality of devices can be controlled simultaneously by single mobile application as well as multiple users can control single unit.
[0020] The retrofit device to convert a ceiling fan into internet of things (IoT) based ceiling fan comprises of a sensor module accommodating a sensor PCB to sense various parameters of the surrounding, wherein the sensor PCB also has an infrared sensor to receive input from the remote controller to control the fan speed, a main module, which is electrically connected to the sensor module, accommodating a main controller PCB to regulate the speed of the ceiling fan. The main controller PCB further comprises of a communication module to send and receive inputs from wireless device, a microcontroller which communicates with the communication module to send and receive the commands and then process the information and regulate the output from the retrofit device to the ceiling fan.
[0021] In an aspect, the sensor PCB further comprises a temperature and a humidity sensor.
[0022] In an aspect, the main module further comprises a power input to receive electrical power from an electrical power source.
[0023] In an aspect, the communication module supports Bluetooth, ZigBee, Wi-Fi or other wireless communication standard or customized communication protocols.
[0024] In an aspect, the speed of the ceiling fan is regulated through voice controlled systems like Alexa, Google Home or Siri.
[0025] In an aspect, the memory of the microcontroller contains information related to ambient speed of the fan on any given temperature and humidity.
[0026] In an aspect, the microcontroller regulates the output to the ceiling fan via a fan driver circuit embedded in the main controller PCB.
[0027] In an aspect, the fan driver circuit comprises power modules to control the fan speed.
[0028] In an aspect, the power modules include triac or relay or MOSFET or IGBT or IPMs.
[0029] In an aspect, the device regulates the output to the ceiling fan using IR remote or IoT or Bluetooth.
[0030] In an aspect, multiple users can control the ceiling fan wirelessly.
[0031] In an aspect, an LED is electrically coupled with the main controller PCB.
[0032] In an aspect, the correlated color temperature (CCT) of the LED is controller in multiple steps.
[0033] In an aspect, the main controller PCB has a timer to regulate the output to the ceiling fan.
[0034] In an aspect, the device further comprises a display PCB to display the status of the modes along with fan speed, temperature and humidity.
[0035] In an aspect, the main module of the device is placed inside the canopy of the ceiling fan and the sensor module is placed outside the canopy of the ceiling fan.
[0036] The present invention further relates to a method of the working of the retrofit device according to the present invention. The method comprises of the steps of providing electrical input to main module and sensor module using power input from a power source, receiving digital inputs at main controller PCB from sensor module or communication module processing the received digital inputs by main controller PCB, and regulating the output of the ceiling fan through a fan driver circuit.
[0037] In an aspect, the digital input received on the main controller PCB is through IR sensor or Bluetooth or ZigBee or Wi-Fi or other wireless communication standard or customized communication protocols.
[0038] In an aspect, the digital input is user mode or auto sensing mode.
[0039] In an aspect, in auto sensing mode the main controller PCB receive temperature and humidity as inputs, from temperature and humidity sensors respectively of sensor module, and accordingly regulate the output to the ceiling fan.
[0040] In an aspect, the microcontroller, in the main controller PCB, correlates the received temperature and humidity inputs with the information stored in the memory of the microcontroller regarding ambient speed of the fan on any given temperature and humidity and regulate the output to the ceiling fan.
[0041] In order to further understand the characteristics and technical contents of the present invention, a description relating thereto has been made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0042] Further objects and advantages of this invention will be more apparent from the description when read in conjunction with accompanying drawings of exemplary embodiments of invention and wherein:
[0043] Fig. 1 illustrates an IoT Retro fit device which can be directly installed to the ceiling fan canopy in accordance with an embodiment of the invention.
[0044] Fig. 2 illustrates a Sensor PCB in accordance with an embodiment of the invention.
[0045] Fig. 3 illustrates a Main controller PCB with some components in accordance with an embodiment of the invention.
[0046] Fig. 4 illustrates a IoT retrofit kit with fan to assemble in accordance with an embodiment of the invention.
[0047] Fig. 5 illustrates a complete fan assembly with IoT Retrofit Kit device in accordance with an embodiment of the invention.
[0048] Fig. 6 illustrates a complete fan assembly with IoT retrofit kit and wiring to be done with switch in accordance with an embodiment of the invention.
[0049] Fig. 7a, 7b and 7c illustrates a lay-out of mobile application to elaborate the features of the fan in accordance with an embodiment of the invention.
[0050] Fig. 8a illustrates a flow diagram indicating the smart heat index algorithm and auto sensing mode algorithm for regulation of ceiling fan based on temperature and humidity of the indoor environment in accordance with an embodiment of the invention.
[0051] Fig. 8b illustrates a flow diagram indicating the auto sensing mode algorithm for regulation of ceiling fan based on the calculated smart heat index in accordance with an embodiment of the invention.
[0052] Fig. 9 illustrates block diagram of a method for working of retrofit device according to one of the embodiment of present subject matter.
DETAILED DESCRIPTION OF THE INVENTION
[0053] The present invention discloses an IoT based ceiling fan, and in particular conversion of conventional induction motor ceiling fan which is controlled by manual switch and speed regulator mounted on switch board to the Intelligent ceiling fan which can be controlled by remote control, mobile application, room temperature, room humidity, voice controlled devices as alexa / google home etc. by just installing an additional device in top canopy of the ceiling fan with easy wiring connection.
[0054] Figure 1 illustrates an IoT Retro fit device 100 which can be directly installed to the ceiling fan canopy in accordance with an embodiment of the invention. The IoT retrofit device 100 primarily comprises a sensor module 101 and a main module 102. The main module 102 has a power input 103 to receive electrical power from an electrical power source. The sensor module 101 accommodates a sensor PCB and the main module 102 accommodates a main controller PCB. The main module 102 is electrically connected to the sensor module 101. The sensor module 101, with the help of sensor PCB, senses various parameters of the surrounding and the main module 102, with the help of main controller PCB, regulates the speed of the ceiling fan, based on the sensed parameters, by regulating the power to the ceiling fan.
[0055] Referring to Figure 2 illustrating the sensor PCB 200 in accordance with an embodiment of the invention. The sensor module 101 accommodates a sensor PCB 200 to sense various parameters of surrounding including but not limited to temperature and humidity. To sense the temperature and humidity of the room in which ceiling fan is stationed, a temperature and humidity sensor 201 is provided in the sensor PCB 200. The sensed value of temperature and humidity is afterwards communicated to the main module 102 based on which the main module 102 regulates the speed of the ceiling fan. In addition to the temperature and humidity sensor 201, an infrared sensor (IR sensor) 202 is also provided to receive input from the remote controller to control the speed of the ceiling fan. The input received by the infrared sensor (IR sensor) 202 is electrically communicated to the main module to accordingly regulate the speed of the ceiling fan.
[0056] Referring to Figure 3 illustrating the main controller PCB 300 with components in accordance with an embodiment of the invention. The main module 102 accommodates the main controller PCB 300. The primary function of the main module 102 is to regulate speed of the ceiling fan. The main controller PCB 300 comprises a communication module 301 and a microcontroller in communication with the communication module 301. The communication module 301 is configured to send and receive inputs to and from the wireless device. The communication module 301 is connected to the sensor module 101 and the parameters sensed by the sensor module 101 is communicated to the wireless devices through this communication module 301. Further, the communication module 301 is configured to directly receive the inputs from the wireless device and accordingly regulate the speed of the ceiling fan via microcontroller which is electrically connected to the communication modules 301.
[0057] The microcontroller regulates the speed of the fan in accordance with the mode selected by the user through wireless device or remote control. There are primarily two modes namely auto sensing mode and user mode. In user mode, the user can regulate the speed of the ceiling fan via a remote control or a user friendly app on the phone. The infrared sensor 202 in the sensing module 101 receive the signals from the remote control as input and process those inputs to the microcontroller to accordingly regulate the speed of the ceiling fan. Further, the communication module 301 in the main module 102 receive the signals wirelessly from wireless device as input, such as mobile phone, PDA, laptop, PC or the likes, and process those inputs to the microcontroller to accordingly regulate the speed of the ceiling fan. Furthermore, the user can select auto sensing mode via remote control or wireless device, wherein the microcontroller regulates the speed of the ceiling fan based on the inputs provided by the sensing module 101. Memory of the microcontroller contains information related to ambient speed of the ceiling fan on any given temperature and humidity. The microcontroller correlates the received temperature and humidity as inputs with the information stored in the memory of the microcontroller regarding ambient speed of the fan on any given temperature and humidity and accordingly regulate the output to the ceiling fan.
[0058] The communication module 301 in the main module supports Bluetooth, ZigBee, Wi-Fi or other wireless communication standard or customized communication protocols. It facilitates regulation of speed of the ceiling fan through voice controlled system like Alexa, Google Home or Siri.
[0059] The microcontroller regulates the output to the ceiling fan via a fan driver circuit embedded in the main controller PCB 300. The fan driver comprises power modules to control the output to the ceiling fan and regulate the speed of the fan accordingly. The power modules includes triac or relay or MOSFET or IGBT or IPMs.
[0060] A timer is embedded in the main controller PCB 300 to regulate the output to the ceiling fan. The timer stops the output to the ceiling fan after a predetermined time selected by the user through wireless device or remote controller.
[0061] In another embodiment, an LED is electrically coupled with the main controller PCB to enhance the aesthetics of the fan. The LED provided are in three colours- Warm light (Temp – 2500K-3000K), neutral light (Temp – 4500-5000K), Cool Light (6000-6500K)
[0062] In an embodiment, the retrofit device 100 is provided with a display PCB to display the status of the modes along with fan speed, temperature and humidity.
[0063] Referring to Figure 4 illustrating the retrofit device 100 with fan to assemble in accordance with an embodiment of the invention and Figure 5 illustrating complete fan assembly with Retrofit device 100 in accordance with an embodiment of the invention. The main module 102 of the retrofit device 100 is secured on the down rod 401 of the ceiling fan, one end of which is attached to the ceiling and other end suspended freely. The sensor module 101 of the retrofit device 100 is secured on the ceiling slightly away from the fan in order to expose the infrared sensor 202 to facilitate regulation of speed of the ceiling fan through remote control. The size of the main module 102 of the retrofit device 100 is such that it can be accommodated inside the canopy 402 provided around the down rod.
[0064] Referring to Figure 6, illustrating complete fan assembly with IoT retrofit device 100 and wiring to be done with switch in accordance with an embodiment of the invention. The power supply to the fan is connected through the retrofit device 100 which regulate the output to the ceiling fan according to the user inputs.
[0065] Figure 7a, 7b and 7c illustrates a lay-out of mobile application to elaborate the features of the fan in accordance with an embodiment of the invention. It is just an indicative diagram of mobile application to control the IoT retrofit device 100 ceiling fan. There are five speed stetting, different mode setting, light options and temperature and humidity display available in the mobile application.
[0066] Figure 8a illustrates auto sensing mode algorithm, to calculate Heat Index, for regulation of ceiling fan based on temperature and humidity of the indoor environment in accordance with an embodiment of the invention. When user choose the ceiling fan to be operated on auto sensing mode/ smart mode, the sensor module 101 activates and measure temperature and humidity of the surrounding. The measure value is then sent to the microcontroller where the received value of temperature is converted into Fahrenheit. The microcontroller then used this converted value of temperature and determined value of humidity to calculate the heat index as per the expression:

[0067] After the determination of Heat Index from above expression, primarily two conditions appear.
[0068] Condition 1: If the calculated Heat Index is smaller than or equal to 80o F, then the heat index is calculated back in oC. This calculated Heat Index is then fed to microcontroller for regulation of speed of the fan.
[0069] Condition 2: If the calculated Heat Index is greater than 80o F, then the heat index, to be fed to the microcontroller, is determined as per the expression:

[0070] Condition I: If the related humidity is smaller than 13% and Temperature is between 80o F to 112o F, then low humidity adjustments are made to the Heat Index calculated from expression 2. The low humidity adjustments are done as per the expression 3 given below:

[0071] The heat index calculated after low humidity adjustment is then converted in degree Celsius and fed to microcontroller as input for regulation of speed of the fan.
[0072] Condition II: If the related humidity is greater than 85% and temperature is between 80o F and 87o F, then high humidity adjustments are made to the Heat Index calculated from expression 2. The high humidity adjustments are done as per the expression 4 given below:

[0073] The heat index calculated after high humidity adjustment is then converted in degree Celsius and fed to the microcontroller as input for regulation of speed of the fan.
[0074] Condition III: apart from any of the condition disclosed above, if any other condition arrives, the heat index calculated from expression 2 is converted to degree Celsius and fed to microcontroller as input for regulation of speed of the fan.

[0075] Referring to Figure 8b illustrating a flow diagram indicating the auto sensing mode algorithm for regulation of ceiling fan based on the calculated smart heat index in accordance with an embodiment of the invention. The microcontroller then regulate the output to the ceiling fan which subsequently regulate the speed of the ceiling fan as per the smart heat index.
Case I
When value of calculated smart heat index is smaller than 20o C, the microcontroller regulates the speed of the fan to a fixed low speed S1.
Case II
When value of calculated smart heat index is greater than 20oC but smaller than or equal to 24o C, the microcontroller regulates the speed of the fan to a fixed speed S2, which is greater than S1.
Case III
When value of calculated smart heat index is greater than 24oC but smaller than or equal to 28o C, the microcontroller regulates the speed of the fan to a fixed speed S3, which is greater than S2.
Case IV
When value of calculated smart heat index is greater than 28oC but smaller than or equal to 32o C, the microcontroller regulates the speed of the fan to a fixed speed S4, which is greater than S3.
Case V
When value of calculated smart heat index is greater than 32oC, the microcontroller regulates the speed of the fan to a fixed speed S5, which is greater than S4.
[0076] Referring to Figure 9 illustrating block diagram of a method for working of retrofit device 100 according to one of the embodiment of present subject matter. At step 901, the electrical input is provided to the main module 102 and sensor module 101. The retrofit device 100 regulate this electrical input as per user choice and provide output to the ceiling fan.
[0077] At step 902, the main controller PCB 300 receives inputs from the sensing module 101 or communication module 301. The main controller PCB 300 receives inputs from the sensing module 101 when controlling input from the user to the retrofit device 100 is provided through a remote control or auto sensing mode of the retrofit device is chosen by the user. The main controller PCB 300 receives inputs from the communication module 301 when controlling input from the user to the retrofit device 100 is provided by any wireless device and/or user mode is chosen by the user.
[0078] At step 903, the received inputs are processed by the microcontroller to regulate the output to the ceiling fan to control the speed of the ceiling fan. The inputs received on the main controller PCB 300 is through IR sensor or Bluetooth or ZigBee or Wi-Fi or other wireless communication standard or customized communication protocols. The microcontroller, in the main controller PCB 300, correlates the received temperature and humidity inputs with the information stored in the memory of the microcontroller regarding ambient speed of the fan on any given temperature and humidity and regulate the output to the ceiling fan. In auto sensing mode, the microcontroller regulate the speed of the ceiling fan according to the auto sensing mode algorithms as referred in Figures 8a and 8b.
[0079] The present retrofit device 100 convert any ordinary ceiling fan into IoT based smart ceiling fan which can be controlled using Remote controller, IoT or Bluetooth. Further, through present retrofit device 100 a group of ceiling fan can be controller simultaneously with one command. Furthermore, multiple users can control a single ceiling fan through wireless device.
[0080] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
[0081] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.

WE CLAIM:

1. A retrofit device (100) to convert a ceiling fan into internet of things (IoT) based ceiling fan, the retrofit device (100) comprises:
a sensor module (101) accommodating a sensor PCB (200) to sense various parameters of the surrounding, wherein the sensor PCB (200) also has an infrared sensor (202) to receive input from the remote controller to control the fan speed;
a main module (102), electrically connected to the sensor module (101), accommodating a main controller PCB (300) to regulate the speed of the ceiling fan, the main controller PCB (300) comprises of:
a communication module 301 to send and receive inputs from wireless device;
a microcontroller communicating with communication module 301 to send and receive the commands and then process the information and regulate the output from the retrofit device (100) to the ceiling fan.
2. The device (100) as claimed in claim 1, wherein sensor PCB (200) further comprises a temperature and humidity sensor (201).
3. The device (100) as claimed in claim 1, wherein the main module (101) further comprises a power input to receive electrical power from an electrical power source.
4. The device (100) as claimed in claim 1 to 3, wherein the communication module 301 supports Bluetooth, ZigBee, Wi-Fi or other wireless communication standard or customized communication protocols.
5. The device (100) as claimed in claim 4, wherein the speed of the ceiling fan is regulated through voice controlled systems like Alexa, Google Home or Siri.
6. The device (100) as claimed in claim 1, wherein memory of the microcontroller contains information related to ambient speed of the fan on any given temperature and humidity.
7. The device (100) as claimed in claim 1 to 5, wherein the microcontroller regulates the output to the ceiling fan via a fan driver circuit embedded in the main controller PCB (300).
8. The device (100) as claimed in claim 7, wherein the fan driver circuit comprises power modules to control the fan speed.
9. The device (100) as claimed in claim 7, wherein the power modules include triac or relay or MOSFET or IGBT or IPMs.
10. The device (100) as claimed in claim 1, wherein the device (100) regulates the output to the ceiling fan using IR remote or IoT or Bluetooth.
11. The device (100) as claimed in claims 1-10, wherein multiple users can control the ceiling fan wirelessly.
12. The device (100) as claimed in claims 1-11, wherein an LED is electrically coupled with the main controller PCB (300).
13. The device (100) as claimed in claim 12, wherein the correlated color temperature (CCT) of the LED is controller in multiple steps.
14. The device (100) as claimed in claims 1-13, wherein the main controller PCB (300) has a timer to regulate the output to the ceiling fan.s
15. The device (100) as claimed in claim 1, wherein the device (100) further comprises a display PCB to display the status of the modes along with fan speed, temperature and humidity.
16. The device (100) as claimed in claim 1, wherein the main module (102) of the device (100) is placed inside the canopy (402) of the ceiling fan and the sensor module is placed outside the canopy (402) of the ceiling fan.
17. A method (900) for working of the retrofit device (100), the method (900) comprises:
Providing (901) electrical input to main module (102) and sensor module (101) using power input from a power source;
Receiving (902) digital inputs at main controller PCB (300) from sensor module (101) or communication module (301);
Processing (903) the received digital inputs by microcontroller, and regulating the output of the ceiling fan through a fan driver circuit.
18. The method (900) as claimed in claim 17, wherein the digital input received on the main controller PCB (300) is through IR sensor or Bluetooth or ZigBee or Wi-Fi or other wireless communication standard or customized communication protocols.
19. The method (900) as claimed in claim 17, wherein the digital input is auto sensing mode or user mode.
20. The method (900) as claimed in claim 17, wherein in smart mode the main controller PCB (300) receive temperature and humidity as inputs, from temperature and humidity sensors (201) respectively of sensor module, and accordingly regulate the output to the ceiling fan.
21. The method (900) as claimed in claim 20, wherein the microcontroller, in the main controller PCB (300), correlates the received temperature and humidity inputs with the information stored in the memory of the microcontroller regarding ambient speed of the fan on any given temperature and humidity and regulate the output to the ceiling fan.