our order for mcp23017’s is not due for a bit, but we’re not twiddling our thumbs…while we wait we’re making a possible alternative to our popular breakout with the SX1503 which has some availability. this chip is also an i2c-to-16-gpio expander, but doesn’t have any address select pins (boo!) but it does have two bank vccio pins so you can use it for level shifting (yay!) we might also take a look at the sx1509 which is a bit more expensive and requires 3.3V power/logic, but does has PWM and keypad scanning support
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