What is this?
Widely used for DSP(digital signal processing), MCU(Microcontroller Unit) control, programmable logic controller, smart home control etc.
Is there any advantages of the product?
Photo coupler isolation strong driving ability, stable performance; It can be connected directly through the terminal block, which is convenient for connection; Fixing screw hole position for easy installation
How to use it?
Module interface:
1. VCC: connected to the positive pole of 5V power supply
2. GND: connected to negative pole of 5V power supply
3. In1-In4: signal trigger terminal, active at low level
Relay output terminal:
1. NO1--NO4: normally open interface of relay, the relay is suspended before closing, and is short circuited with COM after closing
2. COM1--COM4: common interface of relay
3. NC1--NC4: normally closed interface of relay. The relay is short circuited with COM before closing and suspended after closing
What should I notice?
Please pay attention to selecting the appropriate relay module, especially the voltage and current
WARNING: 