Building high-voltage analog sensor for FrSky telemetry receiver

[@TheMystor]

I'm using the same value resistors and they work great! Worth mentioning, you need to set the range in your transmitter, depending on the accuracy of the resistors, mine is accurate at 22V

[@JoshuaBardwell]

Yep, for sure. The Taranis needs to be calibrated to the value of your divider in the Telemetry screen.

[@natihob]

Hi Joshua, First of all thank you for the information you provide us, I bought the MOTIVE-RC R8SB reseiver And I want to build a voltage sensor for 12 cell batteries and connect it to an A2 port But I noticed that A2 port on this reseiver can get 0-30v 1-6s Can I build the sensor according to the formula 3.3v you showed in the video?

[@adventures_of_oliver]

Did you got voltage to a2 simply by pluging divided voltage to Ain pin or was there something more to do? My taranis don't want to recognize it. I used 1 kohm and 10 kohm divider, it works as vbat, but I would like to use Ain.

[@JoshuaBardwell]

+Oliver Suuster It should work either way. Depending on what receiver you have, the voltage may come in as A1 or A2.

[@adventures_of_oliver]

+Joshua Bardwell I have x4r, a1 is receiver voltage and a2 should be ain. I also did firmware update to x4r maybe it has something to do with that?

[@JoshuaBardwell]

+Oliver Suuster Sorry, no clue. If you have 0 to 3.3v on the A2 input pin, then you should have telemetry reading to the Taranis. Possibly your voltage divider is not correct and you fried the pin by feeding it more than 3.3v?

[@adventures_of_oliver]

Okay, maybe I got lose soldering or something then. I have never fed more then 1.8V to Ain, so I doubt I burned anything.

[@sahejeetsingh4254]

Will it work with x8r?