Always check the latest notes from Ardupilot and ExpressLRS for the latest setup:
https://www.expresslrs.org/quick-start/ardupilot-setup/
https://ardupilot.org/copter/docs/common-tbs-rc.html
Time codes:
0:00 Intro
0:56 Radio Setup
2:55 Wiring the ELRS Rx into the flight controller
6:20 Ardupilot configuration settings
Ardupilot settings to get your ExpressLRS receiver working:
SERIALX_PROTOCOL = 23 (RCIN, replace X with the number of the Serial Port you're using)
RSSI_TYPE = 3
RC_OPTIONS turn on "Suppress CRSF mode/rate message for ELRS systems", stops mode change spam in your GCS and 'Use 420kbaud for ELRS protocol'
FLTMODE_CH = 6
RC5_OPTION = 153
PRO TIP! Some flight controllers have alternate board configs. Check the docs to ensure that something like setting the BRD_ALT_CONFIG to “1” isn't needed..
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