(or 16 will do for a proto)
What is the best BOARD that will make it easy to switch 32 (or 16) relays (via the common Opto-isolate interface).
So... basically digital output 0 - 3 or 0 - 5 volts. Source or sink. But a SMALL form factor and hopefully just one board to interface with Feather Huzzah or PyCom board.
So some I2C or SPI based GPIO device is fine.
Please advise.