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

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Under & Over Voltage Relay Connection with Contactor Power and Control
Under & Over Voltage Relay Connection with Contactor Power and Control

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Smart Simple Relay Wiring Diagram 3 Phase Motor Winding
Smart Simple Relay Wiring Diagram 3 Phase Motor Winding

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5 Pin 12 Volt Relay Wiring / 5 Relay With Socket Wire Harness Spdt 12
5 Pin 12 Volt Relay Wiring / 5 Relay With Socket Wire Harness Spdt 12
How a Relay Module Works and Interfacing a Single Channel Relay Module
How a Relay Module Works and Interfacing a Single Channel Relay Module
Relay Wiring Diagram and Function Explained - ETechnoG
Relay Wiring Diagram and Function Explained - ETechnoG
How Does A 5 Pin Relay Work
How Does A 5 Pin Relay Work
How to Wire 11-PIN Relay for Interlocking & Holding Circuit?
How to Wire 11-PIN Relay for Interlocking & Holding Circuit?
Interface 1-Channel Relay with Arduino - ElectroVigyan
Interface 1-Channel Relay with Arduino - ElectroVigyan
How to Wire a 5 Pin Relay? - ElectronicsHacks
How to Wire a 5 Pin Relay? - ElectronicsHacks
Bosch 5 Pin Relay Wiring Diagram - Allove - Relay Wiring Diagram 5 Pin
Bosch 5 Pin Relay Wiring Diagram - Allove - Relay Wiring Diagram 5 Pin
ESP32 opto-isolated relay board not working - PC817 opto-isolator
ESP32 opto-isolated relay board not working - PC817 opto-isolator
Automate Home Electricals With Relays and Arduino
Automate Home Electricals With Relays and Arduino