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ESP32 opto-isolated relay board not working - PC817 opto-isolator
![2 Channel relay board - OSHWLab](https://i2.wp.com/image.easyeda.com/histories/a1b49e351a334b7b88381b3507aac4e0.png)
2 Channel relay board - OSHWLab
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Relay Tutorial for Arduino, ESP8266 and ESP32
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WiFi + Bluetooth + Manual Switch control 8 relays with ESP32 - Hackster.io
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Arduino Relay Wiring
![ESP32 Relay Module - Control AC Appliances (Web Server) | Random Nerd](https://i2.wp.com/randomnerdtutorials.com/wp-content/uploads/2019/12/Relay-2-ch-channel-module-with-optocoupler-top-view.jpg?resize=750%2C422&quality=100&strip=all&ssl=1)
ESP32 Relay Module - Control AC Appliances (Web Server) | Random Nerd
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ESP32 Relay Module - Control AC Appliances (Web Server) | Random Nerd