4 channel relay module (12V)

overview:

• 4-channel relay module for Arduino
• Status LEDs for relay status
• Operating voltage 12V

• The module complies with international safety standards. The control area and the load area have an isolation groove.
• Double-sided FR-4 PCB design, high-end chip production process.
• The relay can directly control a variety of devices and loads.
• There are four normally open contacts and four normally closed contacts.
• Module size: 72 x 41 x 18.5 mm.
• Net weight: 56 g

Module interface:

• VCC: Positive power supply (through the relay voltage)
• GND: Connect the negative power supply
• IN1: 1 relay module signal trigger side
• IN2: 2-way relay module signal trigger side
• IN3: 3-way relay module signal trigger side
• IN4: 4-way relay module signal trigger side

Trigger requirements:
If the signal is connected to another module, it must be earthed between the two modules (negative power supply). If you share the power supply, you can connect a single signal line.

Meaning of HIGH and LOW:
High-level trigger means that there is a positive voltage between the signal trigger side (IN) and the negative supply. The power supply is normally connected to the trigger side of the trigger. When the trigger side voltage or the trigger reaches the trigger voltage, the relay pulls.
Low level trigger means that the voltage between the signal trigger terminal and the negative power terminal is 0 V or the voltage of the trigger terminal is lower than the voltage of the positive power supply. When the voltage is low enough to trigger, the relay is energized, the negative terminal of the power supply is connected to the trigger side of the trigger and the relay is energized.