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My friend Usman and I are collaborating long-distance on an Arduino project. He’s a software guy (by which I mean he’s a guy actually made of software. OK, not really, but almost) and doesn’t have time right now to get up to speed on hardware. So, I send him bits of hardware as needed. This is how we did the RFID iConveyor project.

In order for him to test sending signals to the Arduino’s digital out pins, I built this plug-in cluster of three LED with integrated resistors.


They’re soldered to a set of four right-angle header pins, and all share ground. Usman can plug this into the pins GND, 13, 12, & 11 and he’ll be off and running, with no need for a breadboard and jumper wire.


John Edgar Park

John Edgar Park

John Edgar Park likes to make things and tell people about it. He works at Disney Research and writes for Make and Boing Boing. He is training for American Ninja Warrior. You can find him at and twitter @johnedgarpark — if you like that sort of thing.

  • anachrocomputer

    I made something similar when I wanted to connect an LCD to my Arduino. The little 5k preset resistor is a bit fiddly, but essential for the LCD contrast control. I soldered it to a scrap of Veroboard and added 0.1 inch header pins to plug into the Arduino’s sockets. I also added sockets (sometimes called “Berg connectors”) so that I could still access 5V and Ground. Photos here:

  • John Park

    Very nice, Anachrocomputer, thanks for sharing it.