2016-12-05 (M) Clockwork Theremin

A list of four questions was written before any more testing on the motor was done.
  • What is the minimum duty cycle to turn the motor?
  • Will an initial jolt of full power make the motor turn at low duty cycles?
  • What is the effect on the motor when full power is applied?
  • Does the motor need a small jolt to make the teeth mesh?

The slow ramping program was given a serial command so it would constantly display the speed. To test, the speed was slowly increased and when the motion was detected the current duty cycle was recorded. On the first attempts, the duty cycle reached 90% before there was any motion. The H-Bridge was exchanged for one that hadn’t released any smoke. Then the same program reported that only 35% duty cycle was necessary to move the motor. For this reason, the H-bridge was scrapped.

Yes, that's a pink phone holder

Despite a fully-functional H-bridge in the project it still ran hot. The heat sink became hot to the touch after a few seconds of running. To demonstrate, an infrared thermometer was pointed at the heat sink while some basic motion was demonstrated. The program had been changed to never use less than 35% duty cycle so the motor is very responsive to the buttons going forward and reverse.

Narrated video of H-bridge demonstration

Parts list:

The rest of the posts for this project have been arranged by date.

First time here?

Completed projects from year 1.

Completed projects from year 2.

Completed projects from year 3.

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2016-12-05 (M)