Docs for ThunderFly TFRPM01 tachometer sensor

[kaklik]

User documentation of RPM sensor added in following pull-request: PX4/PX4-Autopilot#14018

[hamishwillee]

Two of the images have large file sizes - can you please reduce the size so that there is less download cost for people with poor internet (e.g. across great wall in china). For example, for tfrpm01_electronics.jpg you can cut out all the empty whitespace around the image and resize width to about 500px and it shrinks to 79K without losing any information in rendered version.

[hamishwillee]

This document will have to be added to en/SUMMARY.md or it will not render (just follow pattern of other docs).

[kaklik]

Document listing added.

[hamishwillee]

If you look at the docs we typically have a parent page explaining what the sensor does, then "instances" below. Can you create a parent page under sensors for tachometers and then link to that (rather than going straight to your implementation).
Note, otherwise what happens is that these is no obvious way for people to extend and add other implementations.
The parent page can have most of the same info you have here and any generic config for tachometers - though it doesn't look like there is any of that (I assume PCF8583_POOL etc are specific to your tachometer?)

[hamishwillee]

Thanks @kaklik . I have merged this so I can update it further (see #676)

I still have some questions:

1. You say "The sensor/probe hardware needs an pulse signal." - is there any definition of this signal? ie. voltage, max/min frequency etc? E.g. if someone wants to use a probe how can they check it is compatible?
2. What diagnostics does the LED provide? ie. just "on/off" or something else? Good to add that information.
3. Is there a purchase link we can add to "5100 Miniature Flange Mounting Proximity Sensor"