What is it?

The SSR1/A is a dual channel AC solid state relay in an arduino shield form factor. It allows to control 2 AC loads up to 8A (heatsink required) using two arduino GPIOs.

• each channel can be controlled by a choice of arduino pins using jumpers
• opto-isolated for safety
• uses zero-cross opto-triacs for reduced line noise
• optional triac snubber

Why did you make it?

Many MCU applications use electro-mechanical relays to control AC loads. While this is an excellent solution for occasionally turning on/off a load, it is not suited for frequent switching or PWM applications. SSR1/A is an opto-coupled solid state relay that can control two AC loads in a arduino shield form factor.

Warning

This is not a toy. Adult supervision is required at all times. High Voltage Parts of this circuit are not isolated from earth ground and contain potentially lethal voltages. Never touch any part of the circuit when powered on. Read the full safety warning before using the board.