1-Channel Relay Module 5V/12V/24V — Optocoupler Isolation, High/Low Trigger, Arduino

1-Channel Relay Module — 5V/12V/24V, Optocoupler Isolation, High/Low Trigger

This single-channel relay module with SMD optocoupler isolation allows an Arduino, ESP32, or Raspberry Pi to switch AC and DC loads up to 250V/10A using a low-voltage digital signal. The optocoupler provides electrical isolation between the control circuit and the high-voltage load circuit, protecting the microcontroller from voltage spikes and noise. Supports both high-level and low-level trigger for compatibility with any MCU output.

Electrical Specifications

• Coil Voltage: 5V / 12V / 24V (select version)
• Maximum AC Load: 250V / 10A
• Maximum DC Load: 30V / 10A
• Trigger: High level or low level (selectable)
• Isolation: SMD optocoupler — electrical isolation between control and load
• Contacts: SPDT — NO (Normally Open) and NC (Normally Closed)
• LED Indicator: Status LED for relay state

High vs Low Level Trigger

• High level trigger: Relay activates when control pin goes HIGH (3.3V or 5V) — default for most Arduino projects
• Low level trigger: Relay activates when control pin goes LOW (GND) — for active-LOW MCU outputs

Wiring

• VCC: 5V (or 12V/24V depending on version)
• GND: Ground
• IN: Control signal from Arduino digital output pin
• COM: Common terminal of relay
• NO: Normally Open — connects to COM when relay is activated
• NC: Normally Closed — connects to COM when relay is NOT activated

Typical Applications

• Smart home light switching (AC 220V)
• Arduino-controlled appliance switching
• Pump and solenoid valve control
• Temperature-controlled heating/cooling switching
• IoT home automation with ESP32/ESP8266

Single-channel, optocoupler-isolated relay module — safe and reliable AC/DC load switching for Arduino, ESP32, and Raspberry Pi projects.

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