SparkFun Opto-isolator breakout

This is a board designed for opto-isolation. This board is helpful for connecting digital systems, like a 5V microcontroller, to a high-voltage or noisy system. This board electrically isolates a controller from the high-power system by using an opto-isolator IC. This IC has two LEDs and two photodiodes built-in, allowing the low-voltage side to control a high-voltage side. We often use this board to allow a microcontroller to control servos or other motors that use a higher voltage than the TTL logic on the 3.3V or 5V micro, which may cause electromagnetic interference with our system as the motors turn on and off. This board will isolate the systems, creating a type of electrical noise barrier between devices. This breakout board uses the ILD213T optoisolator and discrete transistors to correct the logic. It comes with two channels and is great for use in noisy circuits where signal lines require electrical isolation. A normal LED opto-isolator will invert the logic of a signal. We added some transistors on this compact board to correct the inversion. What you put into the IN pins will be replicated on the OUT pins, but at the higher voltage.