It has a 1×3 (2.54mm pitch) pin header for connecting power (5v and 0v), and for controlling the relay.
45+ 1 Channel 5V Relay Module Schematic Pics. That's where the relay module comes in. Low level trigger expansion board, which.
1 Channel 5V 10A Relay Module For Arduino PIC AVR DSP ARM ... from aws.robu.in
4 channel 5v optical isolated relay module. Here we'd like to share how we use the esp8266 wifi 5v 1 channel relay delay module to control our home appliances. Do not touch any wires that are connected to mains voltage.
Once is the trigger voltage, this is the voltage required to turn on the relay that is to change the contact from.
A relay is an electrically operated device. Above is an indicative circuit of one channel of 8 channel relay module (this circuit from sainsmart). This relay module has two channels (those blue cubes). The one you use will depend on whether you want the 5v signal to turn the switch on or turn the switch off.
