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Product Design and Engineering

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BLE Gamepad

By krashkropp on June 1, 2025June 1, 2025

I wanted a simple Gamepad to play retrogames on a phone that I could have with me all the time. It is small enough to fit in a wallet and has a 150mah 302030 battery that will last for about 3 hours. overall dimensions are 86mm x 50.8mm x 4mm. There is a D-pad, 4…

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Pick and Place

By krashkropp on April 18, 2025

With the goal to make a medium run of PCBA’s and not wanting to outsource it I started to look at a pick and place machine for the home shop. It didn’t take long to realize I couldn’t afford to buy one or fit a conventional pick and place machine in my garage. I came…

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Perkins Spring Coiler

By krashkropp on March 8, 2024March 8, 2024

Before I start, I know that many people may think it’s unnecessary to have a spring coiling tool. You could use a lathe, buy premade springs for pennies, or even have custom springs made for fractions of a penny. HOWEVER, I have always loved the way spring coiling machines can accomplish what standard machine shop…

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Train engine and track

By krashkropp on April 17, 2023April 17, 2023

I built this for my daughter to ride around the backyard. Its about 1:9 scale with the tracks 6.25″ apart. It uses a 700w 900kv motor direct driving one of the wheels. The track is made of .5″ square steel tubing with a .0625 wall thickness and the ties are 1×2 wood. It can tow…

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Struggling with memory a “bit”

By krashkropp on March 22, 2023March 26, 2023

It’s March 20th 2023, I finally got around to soldering a PCB for the cable tester project. This was the first rev E board and was intended to be placed with the in progress pick and place machine but I broke the camera last week so I finished the parts by hand and reflowed it…

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Wire Tester

By krashkropp on December 28, 2021March 26, 2023

A wire/cable tester to make repeat cables and check continuity. RevC and up has RJ45 connections to make custom test cables easy and has pull-down resistors on pins to be able to check for connections on its own side in addition to across. Both buttons are held to save the configuration and will display a…

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Power Tapper

By krashkropp on November 25, 2021April 19, 2023

A high torque electronic motor positioned perpendicular to a base plate for the propose of tapping holes. The motor is buoyant and free floating so as to be able to feed itself into and out of a hole when tapping it will stay perpendicular to the base plate but allow X and Y linear changes…

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Drone parachutes

By krashkropp on November 16, 2021April 19, 2025

A series of drone parachutes I designed, produced, and sold. Ranging from 36″ in diameter to 120″ in diameter with passive or active deployment up to a 70lb compressed spring that not only moved the parachute away from the drone but reduced the altitude needed to open.

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Nova

By krashkropp on October 13, 2021June 7, 2025

A wireless long range single channel radio for manually deploying a drone parachute. I designed this radio to have a long lasting rechargeable battery, have a quick double tap deployment and, simplistic small exterior.

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Mayday

By krashkropp on September 17, 2021June 7, 2025

Automated drone parachute deployment system. Detects if a drone is free falling or tumbling and deploys a parachute.

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Recent Posts

  • BLE Gamepad
  • Headlamp
  • Pick and Place
  • Perkins Spring Coiler
  • Train engine and track

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