Hi, I just bought 4 of IOPi plus board to control 4 x 32 = 128 GPIO ports for a single Raspberry Pi 3 (model B) board.
I see a simple Python example controlling a single LED here :
But what I need is Node.js Library and sample apps controlling at least either 2 chips on the same board or 2 IOPi boards (may be one LED on each board). I believe you can have total 8 IC chip address (0x20 ... 0x27) with 4 boards.
In other words, I'm looking for Node.js libarary + sample which is equivalent of the same from the above link.
bus = IOPi(0x21)
Any Node.js library developed for this IOPi board? If not, what Node.js I2C library is recommended for this MCP23017 multiplexer based I2C control? (either read or write).