Esp8266 Relay Board Schematic
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Relay Tutorial for Arduino, ESP8266 and ESP32

ESP8266 Relay Board - EasyEDA

esp8266_relay_board_sch – Martin's corner on the web

Nodemcu-esp8266 Wifi controlled motor, solenoid, valve, switch, relay etc

ESP8266 Relay Board with ESP-01S Serial WIFI Wireless Transceiver

transistors - ESP8266 not working to drive relay - Electrical

ESP8266-12F Relay Board - A2D Electronics

ESP8266 Home Automation Google assistant 4 Relay With Power Supply