A module includes 4 relays 5V with Terminal Blocks for both Input and Output Interface Each relay supports Normally Open and Normally Closed and Optocoupler Isolation. Each relay supports High-level Trigger or Low-Level Trigger selectable by a jumper. Relay for Arduino, ESP32, ESP8266, Raspberry Pi, or any 5V or 3.3V microcontroller. Tutorials for Arduino is provided.
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