Working with noisy circuits or need to protect your Arduino from higher voltages?

This opto-isolator board is a lifesaver.

It uses the TLP281 chip with four built-in LEDs and photodiodes to electrically separate your low-voltage microcontroller (like 3.3V or 5V Arduino) from higher voltage or noisy systems (up to 24V).

Each board has four channels – inputs IN1 to IN4 connect to your Arduino pins, and outputs OUT1 to OUT4 handle the high side.

Max output current is about HVCC/5.1K, with a 500mA absorption limit.

Perfect for controlling motors, servos, relays, or any device that might cause interference.

The board is tiny (25mm x 24mm) and comes in a pack of 5, so you can isolate multiple signals.

Easy to hook up: just connect your Arduino GND, input pins, and the high-voltage power (HVCC and HGND).

Great for DIY electronics, robotics, automotive projects, or any setup where you need clean signal separation.

Keep your micro safe and your signals quiet!