Engineering ProjectsMechanical Projects

Coin-Operated Soft Drink Vending Machine


Soft drink vending machines have become ubiquitous in malls, theaters, and various other public places. These electronic vending machines offer convenient, quick, and automatic operation, making them immensely popular. This article dives deep into the mechanism of a coin-operated cola and soda vending machine, explaining its electronic circuitry, coin authentication, and various components.

The Framework

  • Dimensions: Typically, these machines measure 20 x 30 x 40 centimeters, although coke vending machine dimensions can vary.
  • Outer Frame: Made from durable material, the outer frame houses all the internal mechanisms.
  • Supporting Frame, Mounts & Joints: These offer added stability and are designed to hold various parts in place.

Core Components and Mechanism

  • Microcontroller: This serves as the brain of the machine, controlling all actions based on inputs received.
  • Coin Module: A specialized sensor-based circuitry that detects and verifies the inserted coins.
  • Servo Motors: These motors, operated by the microcontroller, release the soft drink once the coin is verified.
  • Shaft and Hinges: Essential mechanical parts that help in the smooth dispensing of the product.

How it Works

  • Coin Insertion: The user inserts a coin into the coin module.
  • Coin Authentication: The module uses sensor-based technology to verify the coin’s authenticity.
  • Microcontroller Action: If the coin is valid, the microcontroller activates the servo motors.
  • Product Dispensing: The motors turn the outlet shaft, releasing a can of soda or cola into the retrieval area.


  • Easy To Use: Its intuitive interface ensures a user-friendly experience.
  • Automatic Operation: The machine’s electronic automation allows for a seamless transaction, adding to its popularity.


Whether you’re interested in small vending machines or are curious about the typical coke vending machine dimensions, understanding the internal workings of these coin-operated marvels adds a new level of appreciation. With advances in technology, these machines continue to offer a convenient and automated way to quench your thirst on the go.

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