available and operated on only one coin but our aim is to design water vending machine which is operated on different coins. In India Fig 6: circuit diagram. B). Coin Operated Water Dispensing System as the name indicates it is based on COIN operation. Press the power button to activate the power supply as shown in. of the coin by the sensors the known quantity of water will be dispense Coin Operated Water Dispensing System B. Block diagram of micro controller. Here we have been presenting a system that is called a coin based water dispenser system. So many systems are available in market like this but that systems coin operated water dispenser diagram so much costly as well as not so much reliable and efficient. When water pump will fill up the glass then IR sensor gives the logic signal to microcontroller then microcontroller will turn off the water pump. By using system, any company can reduce the coin operated water dispenser diagram power and save the money. This system has designed with the help of coin sensor, water pump, IR sensor, LCD display, single phase step down ac transformer, bridge rectifier, voltage regulator and microcontroller PIC18F belongs to 8 bit pic family. So, no need of any extra power supply or adapter to power on this system.