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Explanation about PWM smoothing; essentially a 4-stage RC network but with an eye towards doing it all in one module with WiFi, https://www.adafruit.com/product/2471 Arduino UNO R3, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf 8devices Carambola2, OpenWRT, industrial SoM computer, https://www.8devices.com/media/products/carambola2/downloads/carambola2-datasheet.pdf Pololu Breakout 16-pin 15.2x20.3mm 0.6x0.8\ Raspberry Pi Zero using through hole 3.3mm, height 7, Wuerth electronics 9776060960 (https://katalog.we-online.com/em/datasheet/9776060960.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 28 Pin (http://www.issi.com/WW/pdf/31FL3731.pdf#page=21), generated with kicad-footprint-generator Molex JAE 0.2mm pitch.

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