The MCP23017, a 16-bit I2C GPIO expander, has always been a tasty chip ... This applies to the I2C version specifically — the SPI counterpart, MCP23S17, stays unaffected. Perhaps, using a ...
Despite all this, [rampadc] managed to create a breakout board with a decade counter and an SPI GPIO expander. The board [rampadc] made features one of the proprietary connectors, a few chips ...
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