peter's tinkering

A collection of my tinkering projects. The purpose is mostly to document my projects so that when I come back to something after a few years I will have a head start in remembering how I did what I did. If someone else learns something or is entertained, all the better.

Tuesday, January 20, 2026

Does gas get cold when it expands? Or - How to measure the temperature of a gas extremely quickly.

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  On my previous post, we calculated that when a paintball gun fires, the propellant gas used for a shot is predicted to get extremely cold,...
Monday, November 3, 2025

A less-ideal model of paintball gun efficiency

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At the end of the last post I rattled off a long list of possibly bad assumptions I'd made when analyzing the efficiency of a paintball...
Tuesday, September 16, 2025

Isentropic Efficiency of a Paintball Gun

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Have you ever come across an old paintball gun while cleaning your basement and think “I wonder what the true efficiency of these things is ...
Tuesday, March 7, 2017

Logging the water height in a well cheaply and non-intrusively

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I made a little gadget to observe the water height in my water well over a period of days or weeks. I'd previously found the height by t...
4 comments:
Saturday, January 7, 2017

How to find the water depth in a well ... with a cell phone!

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Have a water well? Want to figure out how deep the water level is? So did I, so I made an overly complicated contraption to do so. But befor...
9 comments:
Saturday, November 5, 2016

Arduino 4-20 mA input

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This is a quick discussion of how to feed a 4-20 mA signal into an Arduino. Looking for 4-20 mA output from an Arduino? See here. I bought...
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Peter
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