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Arduino servo12/3/2023 Of course, when I remove the servo from the device I have keep the servo wiper attached, as the measurements relate to how the wiper is attached whilst it's being calibrated.Īfter calibrating a few servos, I've thought of some improvements that I will build into the next version. It's quite a bit more effort to calibrate each servo precisely, but for my project, it's worth it for the additional accuracy. This way I can pass the angle I want to turn to as a parameter, and programmatically calculate the PWM necessary to rotate this particular servo to that position.Įither way, I'm able to control this servo with more accuracy and confidence than before. Or if I want complete control of what angle I send to, I can use linear regression on the data set to work out what formula relates angle and PWM value (for this servo, PWM = 2.35 * Angle + 159.4).This has a drawback that I can only rotate to angles which are multiples of 10. Record these value pairs and hold them in an array in my Arduino sketch, and when I want to move the servo wiper to 90 degrees (for example), just refer to what PWM value relates to this angle and send that PWM value to the servo.I've a couple of options now for more accurate servo performance: Now I've got some PWM and angle values that are characteristic of this particular servo - other servos might have similar characteristics, but they won't be identical. If I was going to control the servo directly from a pin on the Arduino, I'd replicate that in the device and calibrate the servo against PWM from the Arduino. I want to keep using the Adafruit PWM servo driver for my calibration as that's what I'm likely to use in my final project. I used Autodesk 123D to design a simple rig that would hold the potentiometer, the protractor, a single servo, my Arduino, and the Adafruit PWM servo driver along with a power supply.
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