Four Relays four HV Inputs 8-Layer Stackable HAT for Raspberry Pi

Rich set of features for a very reasonable price

Using the card on the RS485 port, no Raspberry Pi. MODBUS commands from a standard PLC, read inputs and set relays as expected. Great HAT

Good combination of inputs and outputs

The card works as expected. We plan to use the inputs to read the relay outputs, as a super-redundant system to make sure the relay contacts are working.

Works right away...

Documentation was good. Testing with the comnands did it so well, that I decided to develop my solution with popen()... In no time, my solution had 4 working relays and 4 wirking inputs...