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WIRELESS HEADPHONES
I ~ Summary of the Invention
8 . .
The device on which the experimentation vis-a-vis invention has been carried out is a Headphone -
Bluetoothlwireless audio electronic device. This device was wrought to further higher level of
advancements that to make it more automated that requires less or no human interaction other than just
putting it on the head to listen music. An electronic circuit consisting of LDR, microcontroller ICY and
other electronic components were annexed as per the necessity to fabricate the system that detects
presence of light and works out the function of playing and stopping the audio accordingly; of the device.
When the light falls on the Light Detecting Resistor its resistance falls that allow the current from the
leading source flow through the invented circuit that is attached with original chip of the device, to the
microcontroller IC which generates an impulse voltage that is fed to the playlpause button of the device,
resultingin pausing and vice-versa. An n-p-n transistor is employed to the output of ICwhose function is
to impart the governing voltage to play and stop the function of device.
For the best of operation, a variable resistance has been attached to the controller so that sensitivity of
loop circuit can be controlled.
Background of the Invention
Prior-AI.t-and-D~awbacks:-The-headphones-that-are-manufacturedbydifferentcompaniesarethough - - - - -
automated to distinct plane like wireless headphones with BluetoothTMm odule or headphones with jack
that playlpause music automatically when inserted or removed from the source device. Non-of the distinct
company inventions have features (with an automatic headphones) that play and pause the device
functions as when wear around the head or alighted from the ears, respectively.
No publications have been made in the same respective till now.
Solution: The motive of this invention here is the application of basic electrical components so that to
form a circuit that can generate specific pulse voltage that can start audio and stop it when the headphones $
are worn around the head or alighted from the ears of listener respectively, while sensing presence of light -
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source which is the working principle of the device, solving the problem of manual playlpause of audio or
video in the source device. I
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Brief Description of the Drawing -
- -- .= FIG.-1 is- the-complete circuitry-of-the-invention;-the-LDR~re~i~tor~~LED-and-n-p-n-tran~i~t~r-~ -a l-l --a-r e--
connected to the micro-controller IC. The light is detected by LDR and the generated voltage is fed to ICY
which in turn invoke an impulsive voltage that alters the play/pause state of device.
Detailed Description
Referring to FIG.1, the voltage supply, VC,(+3.6V), from the source device, is fed to LDR 7 which
remains inactive until light falls upon it so that to decrease in the resistance of it permit the flow of
current. At junction 8athe voltage is divided and resistor 1 (1000 kQ) withdraws voltage of 1.8 V and rest
is, to the micro-controller 5 (see appendixl) input pin. The output pin is connected to the resistor 3 (10
kQ), the voltage is divided at junction 9 and a voltage V,= +1.8v is supplied to the n-p-n transistor 6,
which is then can be connected to the play and pause button of any audio device. A variable resistance 10,
V.R., has been employed here to vary or for minor adjustment in the circuit sensitivity i.e. threshold
value. The LED 8, is a red LED that glows when the headphones are paused and turns off when the
device is playing music and is placed around the ear. The resistance 4 is to show the internal resistance of
the LED, which has insignificant value of resistance in comparison with the rest of the resistors used in
the circuit.The resistor 2 (10kQ) is connected to withdraw a voltage value so that pulse voltageVt(+1.8V),
that is required to play/pause the audio, can be fed to transistor 6.
The micro-controller IC5,which is used here in the circuit to helm the play/pause the audio, to which it is
annexed, is programmed, to trigger an impulse voltage, at a delay of 1.5 seconds i.e. when the sensor
senses that the device is not in use, not on the ear, it waits for 1.5 seconds prior to pause audio of device
or vice-versa (see program code).
The LDR 7 used in this invention, has a resistance variation of 1kQ to lOkn and has a sensitivity of
3msec. In the absence of light it has zero or very low conductivity and the device keeps playing the audio,
but as soon as the light falls upon it, the resistance decreases abruptly and it allows the current to flow to
the micro-controller and that in turn, since programmed for a delay of 1.5 seconds, pause the audio after
1.5 seconds.The transistor 6, whose terminals are joined or can be soldered to the play/pause button of the
headphone, charges the impulse voltage to play and pause the audio of the headphones that in turn, to the
respective source device.
The Microcontroller IC program:
intsensorvalue = 0;
int threshold = 5 12;
charprevious-state = '0'; // 't' = threshold was greater than sensorvalue previously; Is' = sensorvalue was
greater; '0' = initial state
void setup()
{
pinMode(P1-0, OUTPUT); //RED LED for PAUSE
pinMode(P1-1, OUTPUT); //GREEN LED for PLAY
pinMode(P1-5, OUTPUT); //Trigger/ Vout/ Output signal = + pulse
digitalWrite(P1-5, LOW); Ninitial value set to 0
//initialize
digitalWrite(P1-0, HIGH);
IP'Q DEkHI 19-87 -2Q116 15 -08
digitalWrite(P1-1, HIGH);
delay(1500);
digital Write(P1-0, LOW);
digitalWrite(P1-1, LOW);
1
void loop()
{
threshold = analogRead(A4); //A2 for threshold
sensorvalue = analogRead(A2); //A3 for LDR
if((sensorValue> threshold) && (previous-state!='sl)) { //means it is not on ears.OR detecting light
pause();
previous-state='sl;
delay(1000);
I
if((sensorValue< threshold) && (previous-state!='tl)) { Nmeans it is on ears
play();
previous-state='tl;
delay(1000);
1
void play() {
digitalWrite(P 1-0, LOW);
//digitalWrite(P 1-1, HIGH);
trigger();
- -
I
- aloid-pause()-(- - . -
digitalWrite(P 1-0, HIGH);
//digitalWrite(Pl-1, LOW);
trigger();
1
void trigger() (
digitalWrite(P 1-5, HIGH);
deIay(800);
digitalWrite(P1-5, LOW);
//delay(500);
1
Description of Program
The controller IC5 is connected to the source, by the LDR 7 and by the variable resistance 10. The LDR
connection is sensor value and the variable resistor is the threshold value. Initially the sensor value is kept
lower than the threshold value. When light falls on LDR, its,resistance decreases due to which sensor
value increases. Conditions:
1. When headphones are not on ears i.e.if ((sensor value > threshold)&&(previous state!= 's'))
pause(); i.e. pause () sub-program is called, in which P1-0 is high and PI-1 is low then trigger()
sub-program is called, which sets the P1-5 high and after a delay of 0.800 seconds, sets P1-5
. low, causing an impulse to flow through the transistor, short-circuiting the switch; pauses the
audio. This causes the previous state ='sY. The program will again go into the same loop and
checks both conditions. Since second condition is not met, therefore the program will come out of
that loop and go forward until there is no change in the sensor value. -
2. When headphones are on ears i.e. if ((sensor value < threshold) && (previous state! = 't')) play(),
i.e. play () sub-program is called, in which P1-0 is low and P1-1 is high then trigger () suhprogram
is called, which sets the P1-5 high and after a delay of 0.800 seconds, sets P1-5 low,
that creates an impulse to flow through the transistor, short circuiting the switch and playing the
audio. This causes the previous state ='tY. The program will go again into the same loop to check
both the conditions. Since the first condition is not met, therefore program will come out of that
loop and go forward until there is no change in the sensor value.
Weclaim:
1. A circuit comprising a light detector element, a variable resistance, a micro-controller IC, a LED
bulb, resistors and a n-p-n transistor, in which a light sensing element and a variable.resistance is
used as input signal to the micro-controller IC to give an impulse signal in the form of voltage via
a resistor to an n-p-n transistor.
2. The circuit of claim 1 in which the light detector element is a photo-resistor.
3. The circuit of claim 1 in which the control of functions i.e. the input parameters are manipulated
to give a control output in the form of an impulse voltage; is a programmed micro-controller IC.

We claim:
1. A circuit comprising a light detertor element, a variable resistance, a micro-controller ICY a LED
bulb, resistors and a n-p-n transistor, in which a light sensing element and a variable resistance is
used as input signal to the micro-controller IC to give an impulse signal in the form of voltage via
a resistor to an n-p-n transistor; actionable in the wireless headphones.
2. The circuit of claim 1 in which the light detector element is a photo-resistor.
3. The circuit of claim 1 in which the control of functions i.e. the input parameters are manipulated
to give a control output in the form of an impulse voltage; is a programmed micro-controller IC.