In conclusion, the Modbus 2-channel 5V relay module is a very useful device for making something Modbus compatible. I found the module relatively straightforward to use, and it seems to do a good job ...

Even the tiny Omron G5V-1 SPDT relay shown in the examples below has a coil current of 30mA at 5V. There have been plenty of circuits ... If available, using two outputs to control one relay may be ...

The plan was to use the always-on 5V standby rail to drive a pair of relays. One relay senses the computer’s on/off switch and triggers the ATX power supply to turn on. The problem is the ...