Frequency PWM Generator Servo Stepper Motor Tester

thingiverse

This is a cover for a PWM frequency generator. [Pulse Width Modulated Signals](https://en.wikipedia.org/wiki/Pulse-width_modulation) are commonly used to communicate with servos and other electronic devices. For example you can test your RC servos by hooking this baby up and specify a frequency and duty cycle specified in the data sheet. For example you can test the full travel of a Futaba S3003 servos by using 50 Hz (top number) and duty cycle between 1 and 10% (bottom number). Obviously you can use a receiver and radio to test this but its just one example of its use. I found a [youtube video](https://www.youtube.com/watch?v=hjRVaogl6tw) describing its operation. The generator PCB costs a few bucks shipped from China or around $10 locally if you want it fast. Search for "Frequency PWM Generator". Be sure to get the one that is in the photo because that's the one I used to create the STLs. #### Required Items 1. PWM Generator (XY-LPWM) 2. 4x M2 x 8mm screws or glue (tighten VERY lightly, enough to just hold down the cover) 3. 2.54mm pin headers? (may be included with item) #### Features 1. Working voltage: 3.3 ~ 30V; 2. Frequency range: 1Hz ~ 150KHz; 3. Frequency accuracy: the accuracy in each range is about 2%; 4. Signal load capacity: the output current can be about 5 ~ 30ma; 5. Output amplitude: PWM amplitude equal to the supply voltage; There are options to drive this PWM generator via 9600 bps serial communication. Haven't tried that yet and input for serial comm has been omitted. BTW, the top left screw post is purposefully designed like that. There is a large diode that is close to the post.