SlotMachien is dead. Long live SlotMachIIn!
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README.md
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api_description.txt
circuit-20181127-1212.circuitjs.txt
circuit-20181202-1729.circuitjs.txt
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README.md

SlotMachIIn

IMPORTANT

Make sure to connect the ground of the Arduino with the ground of the Raspberry Pi!

Files

Arduino : file that runs on the Arduino. PI : files that run on the Raspberry PI.

What pins are used?

On the Raspberry Pi:

PIN 27 looks like PIN 21 but it is actually Raspberry Pi 1 Rev 2 (2011.12)
To get the Arduino's status for: open -> PIN 27 close -> PIN 22

To send commands to the arduino: open -> PIN 23 close -> PIN 24

On the Arduino:

This is the schematic, enjoy! Alt Schematic

How does it work?

No idea, but it does