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pre-1stflight: link the ExpressLRS Telemetry Widget - #556

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pre-1stflight: link the ExpressLRS Telemetry Widget#556
MUSTARDTIGERFPV wants to merge 1 commit into
ExpressLRS:masterfrom
MUSTARDTIGERFPV:telem-widget

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Closes #419.

ElrsTelemWidget is an official ExpressLRS project, but the site never mentions it. Grepping the whole docs tree for telemwidget, telemetry widget or ElrsTelem returns zero hits.

Issue #419 asks for it to be surfaced during first time setup, so this adds a subsection to the Telemetry section of the first flight page, immediately after sensor discovery. That is the moment the user has just built their sensor list and is looking at the telemetry screen, so it is the point where the widget is most useful.

Content

Everything is taken from the widget README rather than invented:

  • Install path src/WIDGETS/ELRST into WIDGETS/ so the card holds WIDGETS/ELRST/main.lua
  • Discover sensors before adding the widget, and restart the handset if that order is missed
  • Expected sensor counts, 17 with Betaflight and 23 with iNav plus GPS, which doubles as a check that telemetry is set up correctly
  • The ELRSb.lua, ELRSu.lua and ELRSt.lua function scripts for binding from a switch

Compatibility statement

The README still says "Tested on Radiomaster TX16S with EdgeTX 2.5 only" and there is no newer statement anywhere in the repository. Rather than paper over that, the note repeats it as written and points bug reports at the widget repository. I did not claim it works on current handsets or current EdgeTX, because I have no way to verify that.

A current compatibility matrix would be a good follow up, but it needs someone with the hardware to test rather than a docs change.

Closes ExpressLRS#419.

The widget is an official ExpressLRS project but the site never
mentions it. A search of the whole docs tree for "telemetry widget",
"ElrsTelem" or "TelemWidget" returns nothing.

The natural place is right after sensor discovery on the first flight
page, since that is when the user has just built the sensor list and is
looking at the telemetry screen.

Contents come from the widget README: the WIDGETS/ELRST install path,
the need to discover sensors before adding the widget, the restart if
that order is missed, the expected sensor counts of 17 for Betaflight
and 23 for iNav with GPS, and the ELRSb, ELRSu and ELRSt function
scripts.

The README gives its tested configuration as a TX16S on EdgeTX 2.5 and
there is no newer compatibility statement, so the note repeats that as
written and sends bug reports to that repository rather than implying
support for later handsets that has not been verified.
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Document the existence of ExpressLRS Telemetry Widget

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