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:
