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The machine itself was very primitive compared to the vending machines of the twenty-first century. It included a coin slot, a shelf for the product to be distributed to the consumer, and two levers that when pushed down, activated the system inside. Inside there was a channel for the pieces of gum to fall. Select the longest key from your keyring and insert it gently into the slot. The aim is to press your coin to one of the sides of the chute and coerce it slowly out of the hole. Failing that, get some super glue and a long, thin piece of paper. Dab some glue on the end of the paper and slowly push it into the slot, followed by your key.

Vending machines are automated retailing machines that dispensed items after a credit is inserted into the machine. It became popular because it sells items without human intervention until the supply lasts. The earliest vending made by a Greek mathematician and engineer was a water-dispensing machine. The design is a vending machine that uses an Arduino UNO microcontroller board, DC motor, coin acceptor modules, IR sensors and a spring mechanism to create a mini vending machine.

The circuit is an Arduino UNO based vending machine. It uses a coin acceptor module to accept coin payments. The module is capable of recognizing 4 types of different coins from 15mm to 29mm in diameter. Each of the coins is assigned with a different number of pulses: 1 pulse, 2 pulses, 3 pulses, and 4 pulses. The coins must be configured first before the module can accept it. The acceptor module looks for the diameter, thickness, dropping speed and more to determine if a coin is valid. The coin pin of the module is connected to the Arduino digital I/O pin. Once a valid coin is detected, the LCD will display the amount of credit. If the amount of credit is enough for an item, then the LED will light up the item for that amount to indicate the button now functions. The LCD used is a 20 characters and 4 lines LED monitor. It uses a I2C connections to interface with the Arduino UNO. A library is needed to be downloaded and installed for the Arduino-IIC-LCD GY-LCD-V in order to be interface with the Arduino UNO. Pressing a button will give a signal from the Arduino UNO to the relay to operate the motor. The motor will continue to operate pushing the item using the spiral mechanism until it falls. An IR sensor is placed below the spiral mechanism to detect the item falling, the IR sensor will give the signal to the arduino UNO to stop the operation of the motor if the item falls. The circuit is powered by a 5V DC supply and the motor is supplied by a 6V DC supply.

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Vending Machine Coin Mechanism Repair

The design can be easily created by hobbies of the Arduino platforms. The vending machine can store snacks, drinks and other items than can be easily be vend using coins. The circuit is design with only for 3 items but can be modify to have more items available provided that it is still viable for the Arduino UNO. Vending machine has brought convenience in our lives; it became widely available in markets, schools, airports, bus station, and other places.