The module adopts the HIC communication optocoupler isolation scheme to drive relays, which has stable performance and is very suitable for use in situations where a large number of relays need to be driven with fewer IO ports. The relay can load MAX current of 10A (resistive load) and has three address control bits A2, A1, and A0. It can expand 8 groups of IIC addresses for multiple groups. When you use a 4-channel 1IC relay module, 8 groups of modules can be connected to the MOST on two buses, and only two 10 analog IIC communications are needed to control up to 4x8=32 relays. If you choose a 16 channel IIC relay module, your MOST can simulate IIC control up to 128 relays through two IO ports, which greatly saves your IO in situations where multiple relays are used.

Parameter Introduction
Module type: 4 channal relay control
Input voltage: DC-5V (the signal terminal can be driven by 3.3V and powered separately by an external 5V to the relay)
Control voltage: 0-220V
Working current: 100ma/piece
Load current: 10A (resistive load)/7A (inductive load)
Module interface: KF301-5.08 (Relay)
PH2.0-4P (signal), equipped with a PH2.0-4P to DuPont wire

VIN: Positive pole of signal power supply, 3.3-5V
5V: Relay power supply positive pole, 5V
GND: Input/output negative pole, shared
SCL: IIC clock line, high level consistent with VIN voltage
SDA: IIC data line, high level consistent with VIN voltage
NC: Relay normally closed end
COM: Relay common terminal
NO: Relay often starts
J1 jumper:
Jumper cap plug Short circuit between the signal power supply and the relay power supply
The jumper cap disconnects the signal power supply and the relay power supply