20-Channel Relay Module Designed by Mohammad Mahadi Khaligh This is a 20-channel relay module that uses an analog signal as a detector for PLCs or a simple burglar alarm.

Hardware Modification: You will need to modify your relay module to control the relay via GPIO3 instead of the default GPIO0. This usually involves rerouting the control signal trace on the relay PCB ...

The signal-acquisition-control-modules of existing well-logging tools have poor universality, low integration and poor stability. A general-purpose signal-acquisition-control module for versatile well ...