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

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Opto Relay with Arduino - Other Opto Products - OptoForums
Opto Relay with Arduino - Other Opto Products - OptoForums

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transistors - High-on opto-isolated relay schematic (5 V GPIO drive 24
transistors - High-on opto-isolated relay schematic (5 V GPIO drive 24

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OPTO 22 DC60S5 Solid State Relay 3-32VDC Control | High Purity Equipment
OPTO 22 DC60S5 Solid State Relay 3-32VDC Control | High Purity Equipment

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Opto 22 P240D4 Relay (Pack of 2) - New No Box - Mara Industrial
Opto 22 P240D4 Relay (Pack of 2) - New No Box - Mara Industrial

Opto 22 DC-controlled Power Series Solid State Relay - TremTech
Opto 22 DC-controlled Power Series Solid State Relay - TremTech

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

OPTO 22 240D25 SOLID STATE RELAY - Aeliya Marine
OPTO 22 240D25 SOLID STATE RELAY - Aeliya Marine

OPTO 22 G4 ODC5 Module Relay Output 60VDC 3A | eBay
OPTO 22 G4 ODC5 Module Relay Output 60VDC 3A | eBay

Opto 22 IDC5D Solid State Input Relay (Pack of 2) - New No Box - Mara
Opto 22 IDC5D Solid State Input Relay (Pack of 2) - New No Box - Mara

OPTO 22 240D25 SOLID STATE RELAY - Aeliya Marine
OPTO 22 240D25 SOLID STATE RELAY - Aeliya Marine

OPTO 22 LOGIC RELAY MODULE OAC5 | eBay
OPTO 22 LOGIC RELAY MODULE OAC5 | eBay

Opto 22 ODC5R Low-Voltage Mechanical Relay Output, 5 VDC Logic [New]
Opto 22 ODC5R Low-Voltage Mechanical Relay Output, 5 VDC Logic [New]