Create hardware.md

avionics/TFRPM01/hardware.md

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+---
+layout: page
+title: "Hardware"
+permalink: /avionics/TFRPM01/faq
+parent: "TFRPM01: RPM sensor"
+grand_parent: Avionics
+nav_order: "0"
+---
+
+# Hardware
+
+
+## PCB dimensions
+
+![TFRPM01 PCB dimensions](https://raw.githubusercontent.com/ThunderFly-aerospace/TFRPM01/TFRPM01D/doc/img/TFRPM01_PCB_dimensions.png)
+
+The PCB is designed to be mounted on a flat surface by a center screw hole. The supposed screw diameter is metric 3mm e.g. DIN 912 M3 Hexagon socket Head Cap Screws. The [A2 stainless steel](https://en.wikipedia.org/wiki/SAE_304_stainless_steel) with non-ferromagnetic properties is used for the screw and nut to avoid influence on UAV's magnetometer. 
+
+## Plastic box dimensions 
+
+[![](TFRPM01-dimensions.svg)](TFRPM01-dimensions.pdf)