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#servomotor

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Stefano

Part 3 of building the DIY seismograph. So continuing on the moving arm concept, I settled on using a servo motor as this could easily be driven by the Arduino. I had to make the arm very light so as not to put too much pressure on the small servo motor I was going to use. Here is the model of the arm. Although I went back and forth with different ends to hold the pen, ultimately I ended up going with this clip. Modeled in #freecad #maker #diy #earthquake #arduino #servomotor #seismograph

Image shows a computer aided drawing model of an extended thin arm with holes to make it lighter. At the end of the arm is a hoop for holding a pen. The hoop has a small opening on one side to allow the hoop to expand a bit to hold the pen tightly.
Image shows the actual arm as depicted in the computer aided drawing holding a Sharpie pen, the pen that was chosen as it gave good results. Arm holding pen shown with tip of pen sitting on a sheet of paper. I moved the arm manually back and forth to simulate the servo motor and was pleasantly surprised with the results.
Image showing a piece of paper on which are sketched some black jagged lines, which somewhat resemble the traces from a Seismograph.
An image showing the sam 3D printed arm now connected to the Servo Motor, a small rectangular shaped box under the arm about half way down the arm. This was the Mark 1 prototype with the servo motor mounted in the middle of the arm. Subsequent tests would show that the length of the arm prevented the servo from moving it fast enough to give a good pseudo representation of a seismograph.
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