This is an opto-isolated relay board driven by a single digital pin. It is a 110V, 10A maximum AC relay board in the IoT-Bus form factor.

Buy it in the oddWires store…

Pins Used

IOT-Bus Pin Description
17 Relay
16 Relay (alternative jumper)


IoT-Bus Io Schematic

Click image to enlarge.


Name Description
Espressif32 Espressif Systems is a privately held fabless semiconductor company. They provide wireless communications and Wi-Fi chips which are widely used in mobile devices and the Internet of Things applications.


Name Description
Arduino Arduino Wiring-based Framework allows writing cross-platform software to control devices attached to a wide range of Arduino boards to create all kinds of creative coding, interactive objects, spaces or physical experiences.
ESP-IDF Espressif IoT Development Framework. Official development framework for ESP32.