#Vbat telemetry on JHEMCU PWM Rx

6 messages · Page 1 of 1 (latest)

abstract granite
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I am building a small boat, I love ELRS so I wanted to use a PWM Rx. I bought the JHEMCU because it has an adc pad, but there is very little documentation about the topic. I guess I have to use a voltage divider to not fry the ADC on the esp32(max1v?)
So if a have to use a voltage divider is there a ratio I should use or I can program the ratio on my edgeTx radio to get the proper alarms?

fading anchor
# abstract granite I am building a small boat, I love ELRS so I wanted to use a PWM Rx. I bought th...

generally a couple things:

  • DO NOT use JHEMCU hardware, it's very unreliable, as they are using out of spec components on their receivers, which tend to not work at all, or randomly stop working. the same goes for hiyounger and flywoo.
  • yes, generally you do need a voltage divider, the default resistor ratio you need is 1:24, although you should rather use a higher ratio like 1:33 and modify the /hardware.html page on the receiver, so you can get a full 6S voltage range
abstract granite
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Thanks for the comments of n reliability, I wanted to reject delivery when I found out about the problems with the XO being out of speck and I will check how many ticks of difference there are before longer missions. Right now it is bound correctly to my Jumper t lite internal .

Thanks for the ratio for the divider, it was very hard to find info on the topic. Maybe there should be something about it on the PWM receivers page.

Cheers and happy new year elrs_heart

fading anchor
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the info about the ratio is mentioned in the github PR where vbat telemetry for pwm receivers got first introduced

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but you'd have to know that to be able to find it

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so yeah, no blame on you