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ESP32/ESP8266 Relay Module Web Server using Arduino IDE | Random Nerd

5V Single-Channel Relay Module - Pin Diagram, Specifications

5V Dual Channel Relay Module Pinout, Working, Interfacing with Arduino

Arduino lesson – 2-Channel Relay Module – kookye.com

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5V Dual-Channel Relay Module - Pinout, Specification, Application

4 Channel 5V Relay Module - Wiki