Making a Genesis controller to arcade game PCB #Gaming
Evan Allen was looking to build a robust circuit board to connect Sega Genesis controllers to arcade game PCBs.
The board is based on the ATmega328, common in older Arduino boards. It uses an MCP23018 as an open drain I/O expander to simulate mechanical buttons on those lines connecting to ground.
You can read the details in the blog post and see the code on GitHub.
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