Agricultural Irrigation Controller This Invention relates the improvement in efficiency of water, fertilizer and electricity use for Agricultural Irrigation at low cost using microcontroller based controller (embedded system). Today is the era of water scarcity hence there is need to use water effectively. Micro Irrigation is it solution which involves the pumping of Irrigation water either from surface water, rain water stored in the tanks or ground water. Electricity is required to operate pump, perhaps its timing is not fixed in most of the villages in India. In conventional micro Irrigation system water is applied at regular interval irrespective of actual water requirement. Timing of Fertilizer application is another problem in micro Irrigation. Known Irrigation controllers are microprocessor/ computer based hence they are very expensive and out of reach to common farmers. Still the capacity of these irrigation controllers is not enough to met their requirement which results the use of higher size solenoid valves. It again involves high cost. Hence there is need of such a controller that can handle large numbers of valves i.e., high capacity, can consider the actual moisture contain of soil for Irrigation, can handle the supply of fertilizer application and can handle irregular electricity. The present invention overcomes the above drawbacks and provides a controller having very high capacity (no. of valves), that can facilitates fertilizer application and monitors soil moisture content at low cost (using compatible sensor). This controller can also be operated in time based mode. In this mode there is facility of correction of seasonal changes in operation time. The following specification particularly describes the invention and the manner in which it is to be performed. 1. Maximum number of Valves is 128 (one hundred and twenty eight). Perhaps number of valves operating at a time i.e., in one section depends upon transformer capacity and power requirement of Solenoids. 2. This controller can operate 24 V AC solenoid valves. 3. Maximum number of possible Section is 70. 4. One Doasing pump can be used with this controller for Fertilizer application using electromagnetic switch of 24 V. 5. One Irrigation Pump can be operated using this controller using electromagnetic switch of 24 V. 6. There is provision to operate the controller in two modes i.e., Time Based and Sensor Based. Hence in case of non availability of soil moisture sensor Time based mode can be used. 7. Irrigation Time for One Section can be up to 240 (Two Hundred and Forty) minutes. 8. Irrigation Interval can be from 1 day to 7 days in case of time based mode. Complete Description The heart of this controller is 8 bit microcontroller, Real time clock (RTC), Erasable Programmable Read Only Memory (EPROM), 4x4 matrix keypad, 2x16 LCD screen and Relay. A program (written in 'Embedded C language and compiled using evaluation version of Keil C compiler) is prepared for this microcontroller and is embedded it inside the microcontroller using Flash magic software which is available for non production use. One RTC, DS1307 is used for seasonal correction in Irrigation Operation Time in case of both Sensor/ Time based mode and Startup of Irrigation in case of Time based mode. One EPROM is used to store the information provided by the user while programming the controller at user end, these information are used by controller in normal operation. One 2x16 LCD Screen is used to display the information and one 4x4 Keypad is used for programming of controller at user end. Two Relay is used along with darlingtone pair of transistor is used to operate irrigation and fertigation Pump. One transistor is provided to provide zero logic to microcontroller when a positive voltage is applied to base of transistor (when soil moisture sensor sends signal) then the controller starts Irrigation. Since this controller is made up of 8 bit microcontroller hence 8 bit Serial-ln-Parallel-Out (SIPO) shift register is used to manage the deficiency of required channels (pins). Power Supply: 12-0-12 V transformer is used for power supply and is used as 0-12-24 V transformer. Half wave rectification is used at both 12 V and 24 V level. Regulated 5 V for digital system is produced using 5 V linear regulator IC. 24 V unregulated DC is supplied to Electromagnetic switch of motor of Irrigation and fertigation Pump via Relay which is controlled by microcontroller. The neutral is same for 5V DC, 12 V DC, 24 V DC and 24 V AC supply. Memory organization of EPROM: 4kb EPROM is considered for this controller. The size of one data word is 8 bit hence there are 512 word in the EPROM. These words is divided in two blocks of 2S6 words namely block '0/ for first 256 word and block '1' for second 256 word. The schematic diagram of controller and decoder is presented in fig. 1 and fig. 2 respectively and its operation can be described as follows: a. This controller is based on 8 bit microcontroller NXP P89VS1R02 having four ports PO, PI, P2 and P3each having 8 pins open for input/output. b. All pins of port PI is used as data pins of 2x16 Liquid Crystal Display