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I am looking very hard but can't figure out which one of the 16 additional I/O pins can do PWM output, anyone?
The additional 16 digital I/O lines are implemented with the MCP23017 (http://www.microchip.com/wwwproducts/en/MCP23017).
It provides 16-bit, general purpose parallel I/O expansion for the I2C bus. There is no PWM.
Thank you, rpidmx512