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Tux Machines
Posted by Roy Schestowitz on Aug 29, 2022
> Material testing often comes down to breaking stuff and measuring how much force it took to do so. How a thing breaks is a result of different strength properties. There are many different types of strength, but mechanical engineers are most concerned with tensile, compressive, shear, and torsional strength. The easiest way to test compressive strength is to squish something with a very powerful press. Element14 Presents’ Clem Mayer purchased a 20-ton hydraulic press for that purpose and used an Arduino to measure its force.
> Even if you don’t have any shop experience, you’ve probably seen a hydraulic press in action in one of those YouTube videos where they squeeze household objects until they explode in an entertaining way. This particular press can exert up to 20-tons of force, which is about as heavy as three elephants. The actual pressure depends on how much area that force applies to. To calculate the pressure at the time of failure, Mayer needs the contact area (which is easy to measure ahead of time) and the current amount of force that the press is applying. He collected the pressure data using an Arduino Leonardo and a load cell.
> The best part about this creation being controllable via mobile phone is that you don’t need a bulky garage door remote on your keychain. You’ve already got your car key (hence the garage), your front door key, back door key, gym locker key, barcode thing you scan at the supermarket to collect points that never really get you anything. You get the picture. Also, have you ever tried to find a replacement battery for an old-fashioned garage door remote control? Skip the hassle and keep your keychain slimline with Michael’s Pico W-based solution.
> RGB LEDs are great for adding a bit of color to your life, and it’s even more satisfying to use a matrix of them as a graphic display. [bitluni] built an RGB LED display with Pi Pico to which you can share a pixelated version of your PC’s screen.
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