Request PID 1209:FD42 for CircuitPython on SAO Digital Multimeter

Signed-off-by: Thomas Flummer <tf@flummer.net>

Author: flummer

1209/FD42/index.md

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+---
+layout: pid
+title: SAO Digital Multimeter
+owner: HXR.DK
+license: CC-BY-SA (hardware), MIT (Circuit Python firmware)
+site: https://github.com/flummer/dmm-sao
+source: https://github.com/flummer/dmm-sao
+---
+A small digital multimeter that is designed as a badge add-on, following the SAO v1.69 specification. It is using the Raspberry Pi RP2040 and features a small OLED screen, rotating knob, function button and probe terminals, all housed in a 3D printed case.
+
+The firmware is using CircuitPython and the code can easily be hacked, by connecting via USB-C to the RP2040.