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How to Use ESP-01 Wi-Fi Relay Module - CyberBlogSpot
Sabah Arduino: Breadboard and Program an ESP-01 Circuit with the
Esp-01 Relay Board Schematic at Travis Valdes blog

ESP01-Relay-Board-AC-DC-MODULE - OSHWLab

Connecting ESP-01 to Relay Module V4.0

Driving 5V relay with ESP-01 - Project Guidance - Arduino Forum

ESP01 Relay - OSHWLab