Electromechanical Timer Replacement - 320Volt

Electromechanical Timer ReplacementTHE SOFTWAREThe software consists of a timer that will count seconds,minutes, hours and days up to fifteen days. After that itwill start the first day again and so on. It then checks theactivation/deactivation table and will turn on the relay,through GP5 output, for the amount of time programmedfor each sprinkler circuit. The switching of thesprinkler system happens outside in the sprinkler gearusing the water flow.The pushbuttons are read by the software and will displaythe corresponding message depending on whichbutton was pressed.This is a low cost sprinkler system, it consists of the followingcomponents:1. PIC12C5082. 3 Push buttons3. 6 Pull-up resistors (10 kOhms)4. Serial LCD Display (2 Rows x 16 Columns)5. NPN Transistor6. Relay7. 5 Volt Regulator8. Wall Transformer (Input 110 VAC, output9 VDC).9. Diode10. Bypass Switch.FIGURE 2:SCHEMATIC+5VPull-upPull-up5 VDCRegulatorPIC12C508GP0GP1ClockDataLCD Display2x16+5VGP2Pull-up Pull-up Pull-upGP3DayHourGP4GP5Minutes+5VN.C.To ElectricValveN.O.C.DS40160A/1_004-page 2© 1997 Microchip Technology Inc.