coin based water dispenser system with diagram
#1

Circuit diagram or layout for coin based water dispenser.
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#2

Coin Based Water filler/ dispenser System project is developed for the users to use paid mineral water dispenser system.

It consists of a Coin box, coin sensor, water sensor, Microcontroller unit, Mineral water tank, pump motor etc.

The user can use Mineral water by inserting coins in the coin box. A coin sensor is connected in the coin box. According to the coin dropped in the coin box, the sensor sends signal to the microcontroller unit. The microcontroller analyses the number of coins dropped in the box and accordingly it operates the pump motor.

The pump motor delivers the mineral water from the tank according to the validity of the coin. If the water in the water tank reaches minimum level, the microcontroller operates a buzzer. Thus the tank can be filled immediately.

The Microcontroller programs are written in assembly language. The microcontroller used is ATMEGA 328.

This will be very useful in industries, houses, institutions etc

WORKING
Our system works on the principle of coin detection. When we insert the coin in the slot, it will detect by the sensor we used. Here we used IR based optocoupler for the coin sensor.

With an opto-coupler, the only contact between the input and output is a beam light. When coin is passed through the slot Infrared light beam is interrupted, pulses are generated at the output of coupler . It will passes output signal to the microcontroller and according to the output signal microcontroller start for working.

First it will check interrupt, if there are interrupt on signal it means coin is inserted. Microcontroller display ” put glass “message on lcd. Then it will switched on water pump. And water will fall in glass. Time is set for water pump. When set time is over pump is switched off automatically. After that it will display “thanks” message on lcd. Then counter will increment for another coin. When counter is overflow it will show coin box is full, reset counter.
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