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Relay Module

This dual-channel relay module is engineered to safely and reliably interface with microcontrollers that manage higher-voltage or higher-current loads. It provides a dedicated 5 V supply for powering the relay coils while the logic supply is aligned with the microcontroller’s I/O voltage (3.3 V or 5 V). The module accepts digital control signals to toggle the relays, and the relay contacts are designed with both normally-open (NO) and normally-closed (NC) configurations, offering versatile switching options.

Features

  • 2 × 5 V relays with Normally Open (NO) and Normally Closed (NC) contacts
  • Optical isolation between control (logic) and power (coil) sides
  • LED indicators: one for power and one per channel
  • Compatible with 3.3 V or 5 V logic
  • Screw terminals for secure connection of power loads

Description

SignalDescription
JDVCC+5V for relay coils; isolated from MCU logic, enabling 3.3V systems.
VCCPowers input drivers; must match MCU voltage (3.3V or 5V).
INMCU signal; high (~VCC) activates the optocoupler and relay.
NO1 / NO2Normally open contacts; close only when the relay is energized.
COM1 / COM2Common terminal toggling between NC and NO.
NC1 / NC2Normally closed contacts; open when the relay is active.
LED_PWRLED showing JDVCC (5V) presence.
LED_INLED indicating control signal activity from IN.

Common Applications

  • Home Automation
  • Industrial Automation
  • IoT Projects
  • Automated Irrigation
  • HVAC Control
  • Renewable Energy
  • Testing & Laboratory
  • Robotics & Mechatronics
  • Smart Agriculture
  • Vehicle Power Management
  • Audio & Signaling
  • Security & Alarm Systems
  • Education & Demos