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Articles | Forum | Remote | Downloads | Buy License

Common Coinslot/Multi-coin Acceptor Problems and Solutions

by Adones Pitogo

Problem #1: Coin not detected

Solutions:

  • 1. Check for looses wirings

While building your machine, some wirings may come loose due to constant work. Review your wirings to see if there are loose connections.

  • 2. Make sure your power source is 12v DC

The coinslot will only work with 12V DC power source. Make sure the power source is 12V DC.

  • 3. Check common ground

Make sure ground wire from the coinslot power source is connected to the ground pin (pin #9 or any ground pin) of the raspberry pi.

  • 4. Change GPIO pin number

The default RPI GPIO pin (pin #3) set to detect the coins may not be working. We'll try to use a diferrent GPIO pin in detecting the coins. To do this, login to machine's web admin interface and go to Timer Settings.
Under Use GPIO # dropdown, select the GPIO number you want to use. This is the pin where you connect the coin (white) wire from the coinslot.

  • 5. Restart coinslot

Try to unplug/replug the coinslot from power source.

  • 6. Try diferrent coinslot

The coinslot may be broken and needs replacement.

Problem #2: Coins are rejected

Solutions:

  • 1. Recalibrate the coinslot

Sometimes, the coinslot was calibrated poorly that's why it can't recognize the coins. To fix this, follow these videos on Youtube on how to recalibrate the multi-coin acceptor.

  • 2. Measure your power source is 12v DC

The coinslot will only work with 12V DC power source. Make sure the power source is 12V DC.

  • 3. Remove dust with blower

Dusts can also be the cause why the sensor is not working correctly. Blow the dusts off the internal of the coinslot.

  • 4. Try diferrent coinslot

The coinslot may be broken and needs replacement.

RPI GPIO pin numbering reference:

Alt Text


Updated Diagram - with coinslot disabler using SET pin

Using Coinslot's SET pin(TOP only) to enable/disable accepting coins

Setting Up Serial Coinslot Sensor using Arduino

Using Arduino as coin acceptor sensor

by Adones Pitogo