ESP32 opto-isolated relay board not working - PC817 opto-isolator

Relay Board Schematic

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4 Channel Relay Board - Electronics-Lab.com

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4-channel-large-current-relay-board-schematic - Electronics-Lab.com
4-channel-large-current-relay-board-schematic - Electronics-Lab.com

Esp8266-01 two relays

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8 Opto-isolated Relay board - Electronics-Lab.com
8 Opto-isolated Relay board - Electronics-Lab.com

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ESP32 opto-isolated relay board not working - PC817 opto-isolator
ESP32 opto-isolated relay board not working - PC817 opto-isolator

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14+ Arduino Relay Board Schematic | Robhosking Diagram
14+ Arduino Relay Board Schematic | Robhosking Diagram

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ESP8266-01 two relays - EasyEDA open source hardware lab
ESP8266-01 two relays - EasyEDA open source hardware lab

Arduino & Relay Wiring Diagram
Arduino & Relay Wiring Diagram

8 relay module schematic - Wiring Diagram and Schematics
8 relay module schematic - Wiring Diagram and Schematics

4 Channel Relay Board - Electronics-Lab.com
4 Channel Relay Board - Electronics-Lab.com

[DIAGRAM] Megasquirt Relay Board Diagram - MYDIAGRAM.ONLINE
[DIAGRAM] Megasquirt Relay Board Diagram - MYDIAGRAM.ONLINE

Relay - General Electronics - Arduino Forum
Relay - General Electronics - Arduino Forum

Esp8266 Relay Board Schematic
Esp8266 Relay Board Schematic

Is my 12V relay module schematics correct? Need expert help : r/arduino
Is my 12V relay module schematics correct? Need expert help : r/arduino