Things are getting exciting now in the Arduino Nerf sentry gun build! I’ve connected the main components together now — primary Arduino, secondary Arduino, motor, and power for the gun (I decided to removed the six D cell batteries and power it from an AC-DC transformer).


Here’s the Molex connector I soldered in place of the battery pack.


The primary Arduino is mounted to the stand, with 7-Segment shield display visible.


I cut a window into an aluminum chassis, and mounted the ultrasonic PING))) sensor inside. I attached it to the Nerf gun using a super-strong 3M version of Velcro.


The connector jack I mounted in the grip for the trigger wire was flopping around too much, so I secured it with a little bit of Sugru silicon molding clay. It’s excellent for this kind of fix. However, I found my hands were slippery like Teflon afterward, right when I had to screw in a zillion little screws.

I took these photos a few days ago, now I’m (not so) patiently waiting at Maker Faire for my boxes to arrive so I can set it all up to show in the Maker Shed and on the Make: Projects Stage.

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.

  • Theo Flokos

    wow!!!Good work.I din’t expected it to be so cool.
    I think you deserve a BRAVO.

  • Nate

    Well done, John!

    Now, you just need to get someone to paint the gun, so it doesn’t look so silly.