1 Way Relay Module High Level Trigger

1 Channel Relay Module for D1 Mini is a compact relay expansion board designed to be used with the D1 Mini ESP8266 development board. It allows control of high-voltage AC or DC loads such as lights, fans, or motors directly from your D1 Mini. This module is plug-and-play with matching headers and requires no additional wiring for communication.

Key Features:

• Single Relay Channel: Controls one AC or DC device up to 10A.
• Designed for D1 Mini: Compatible footprint with direct stacking onto the D1 Mini board.
• Opto-Isolated Input: Offers isolation between microcontroller and relay driver for protection.
• Status LED: Indicator shows the ON/OFF state of the relay.
• Compact Size: Ideal for space-constrained IoT applications and embedded automation.

Technical Specifications:

• Relay Type: SPDT (Single Pole Double Throw)
• Control Signal: Active LOW
• Operating Voltage: 5V (powered via D1 Mini)
• Max Switching Current: 10A at 250VAC or 30VDC
• Trigger Pin: D1 pin by default (can be rewired)
• Isolation: Optocoupler-based input isolation

Mechanical Specifications:

• Board Size: Approx. 25mm × 28mm
• Pin Type: Female header for stacking
• Mounting: Stackable via D1 Mini interface
• Relay Color: Typically blue with transparent cover

Mounting Options:

• Stack Mount: Directly stack onto D1 Mini board via female headers.
• Stand-alone Use: Can also be used via jumper wires with any 5V logic board.

Schematic Diagram, Connection, Wiring and Pinout:

• Relay Terminals: COM (Common), NO (Normally Open), NC (Normally Closed)
• MCU Connection: Default trigger pin connected to D1 (GPIO5)
• Power Supply: 5V and GND provided by D1 Mini header

Datasheet and Documentation:

• Download 1 Channel Relay Module Datasheet (PDF)

Applications:

• Home Automation: Remotely control lights, fans, and other appliances via Wi-Fi.
• Smart Switch: Build IoT switches using ESP8266 with relay output.
• Security Systems: Activate alarms or lock systems remotely.
• Industrial Monitoring: Switch relays based on sensors or time-based triggers.
• Remote Relay Control: Use MQTT, HTTP, or Blynk to trigger relay over network.

Equivalent Models:

• 5V Relay Module: General-purpose module with similar ratings for Arduino or ESP8266
• Songle SRD-05VDC-SL-C: Common relay used in these modules
• 1-Channel Relay Shield: Similar module for NodeMCU and other ESP boards

Package Includes:

• 1 x 1 Channel Relay Module for D1 Mini