1 Channel 5V Relay Module Optocoupler Isolation for Arduino ESP32

1 Channel 5V Relay Module – Optocoupler Isolation for Arduino & ESP32

The 1 Channel 5V Relay Module allows microcontrollers to switch high-voltage AC or DC loads using a low-current GPIO signal. The onboard optocoupler isolation protects your microcontroller from voltage spikes and electrical noise generated by inductive loads, making it a safe and reliable choice for home automation and IoT control circuits.

Key Specifications

• Channels: 1
• Control Voltage: 5V DC (TTL compatible)
• Relay Rating: 10A @ 250V AC / 10A @ 30V DC
• Trigger: Active LOW (default) — LOW signal activates relay
• Isolation: Optocoupler (PC817 or equivalent)
• Indicator LED: Onboard status LED
• Connector: 3-pin (VCC, GND, IN) + screw terminals (NO, COM, NC)

Compatibility & Use Cases

This relay module is directly compatible with Arduino, ESP32, NodeMCU, and Raspberry Pi GPIO pins. Common applications include:

• Home automation — controlling lights, fans, and appliances
• IoT-connected smart switch and remote control systems
• Motor and pump ON/OFF control circuits
• Automated irrigation and greenhouse control
• Industrial equipment switching and safety interlocks

Use the NO (Normally Open) terminal for loads that should be OFF by default, and NC (Normally Closed) for fail-safe circuits that must stay ON unless triggered.

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