A 5V Four-Channel Relay Module packs four independently controlled electromagnetic relays onto a single printed circuit board (PCB). This space-saving board allows low-power microcontrollers (like Arduino, NodeMCU, or Raspberry Pi) to switch up to four separate high-voltage AC or DC appliances simultaneously. It is the absolute standard choice across India for baseline smart-home automation dashboards (controlling a light, a fan, an AC, and a television independently) and multi-actuator robotics projects.
✨ Key Features
- Quad Optocoupler Galvanic Isolation: Features four onboard PC817 optocoupler chips that physically separate the digital control signals from the heavy high-voltage lines using light, protecting your microcontroller from inductive spikes.
- Detachable Power Isolation Jumper: Outfitted with a standard JD-VCC / VCC jumper cap that allows you to feed an external 5V power supply strictly to drive the heavy magnetic coils, isolating electrical noise completely from the microcontroller logic.
- Low-Level Signal Triggering: Configured to trigger on a Low Logic Signal (0V) by default, meaning pulling the signal input pins to Ground closes the relay contacts and completes the circuit.
- Visual Diagnostics Layout: Equipped with five surface-mount LEDs; one to confirm steady Power input (Red) and four independent channel tracking LEDs (IN1 to IN4) to visually show which specific relay is active.
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