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

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

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74hc595 circuit diagram - Wiring Diagram and Schematics
74hc595 circuit diagram - Wiring Diagram and Schematics

Schematic circuit of the relay board.

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Relay Circuit and Breakout Board - Hardware Breakout
Relay Circuit and Breakout Board - Hardware Breakout

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5 Pin Relay Wiring Diagram - Use Of Relay
5 Pin Relay Wiring Diagram - Use Of Relay

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4 Channel Relay Module Schematic
4 Channel Relay Module 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

Schematic circuit of the relay board. | Download Scientific Diagram
Schematic circuit of the relay board. | Download Scientific Diagram

12V 1/2/4/8 Channel Relay Board Module for Arduino Raspberry Pi ARM AVR
12V 1/2/4/8 Channel Relay Board Module for Arduino Raspberry Pi ARM AVR

Esp01 Relay Schematic
Esp01 Relay Schematic

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

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

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