Hey Everyone - I'm back after having a little one and after a year off, and I seem to have forgotten some things as I'm having issues with my new build.

Issue: I'm getting no voltage reading in the DJI goggles v1 (showing as 0.0v), but I am seeing RSSI and the OSD from betaflight, so I know the vista is wired correctly.

My new build is a 3.5" Octocopter using:

• HAKRC f722v2 FC: HAKRC 7220V2 Flight Controler – NewBeeDrone
  
• 2 ESCs: HAKRC 8B45A 4IN1 ESC – NewBeeDrone
  
• 8 Motors: EMAX 1408 2300kv for 6s: EMAX RS1408 Performance Brushless Motor (getfpv.com)
  
• Caddx Vista Nebula Pro
  
• Target: HARC/HAKRCF722v2(stm32f7x2) - 4.4.2
  

I've connected the plug from one ESC directly into the FC since the wirings match, and I've connected just the motor wires from ESC 2 to the second ESC motor mappings on the FC

• I've put a crsf nano on UART1
  
• the manual says for DJI, you must open UART3 along with the MSP on UART4
  
• the receiver is working fine and I set all the modes
  
• All motors are working as expected and were easy to setup with the betaflight wizard
  
• I'm getting correct orientation
  
• Voltage and Current Meter set as onboard ADC
  

 the dump and the diagrams from the ESCs and the FC as attachments

Under the peripheral column of UART 4 you need to set it as follows

Thank you for the suggestion, but it did not affect the DJI goggles showing 0.0V in the goggles.

So you are seeing the full BF OSD on your goggles already, not just the goggles RSSI?
When you connect to BF, under the power/battery tab are you seeing lipo voltage when you connect your lipo?

(15-Feb-2024, 08:28 PM)mstc Wrote: So you are seeing the full BF OSD on your goggles already, not just the goggles RSSI?
When you connect to BF, under the power/battery tab are you seeing lipo voltage when you connect your lipo?

I am able to see the betaflight OSD, and it is showing the RSSI, but I'm not seeing voltage in Betaflight or in the goggles:

That is with your lipo plugged in? That is odd as from your config file looks like voltage is set correctly to ADC which is typical for FCs and the ADC_BATT resource is mapped. Is the current sensor showing a reading? Check the power/battery tab in BF configurator.

It maybe worth checking with the shop you purchased this from.

(15-Feb-2024, 09:32 PM)mstc Wrote: That is with your lipo plugged in? That is odd as from your config file looks like voltage is set correctly to ADC which is typical for FCs and the ADC_BATT resource is mapped. Is the current sensor showing a reading? Check the power/battery tab in BF configurator.

It maybe worth checking with the shop you purchased this from.

yup unfortunately - I was hoping there was a step I might've missed but it sounds like I might've just gotten a cheap FC lol. I'm going to try and see if newbeedrone will do anything. IF not, I'll think of ways I can add a voltage meter or simply buy another FC...

Is there a way to map the Current sensor somewhere else or no?

ADC stands for analog-to-digital converter, basically a subset of pins on the MCU have this ability and can read analog voltage levels (usually from 0 to 3.3v). The voltage sensor has a voltage divider (a two resistor circuit) connected to that pin so it basically scales down lipo voltage to the 0-3.3v range. A current sensor will have a large shunt resistor attached to the ADC pin. So they are hardware dependent and not simply swappable in settings.

If you find another free pin that has ADC (check the MCU spec sheet) and like to experiment, you could potentially add your own voltage divider and remap the voltage sensor to that pin.
https://en.wikipedia.org/wiki/Voltage_divider

If you have ESC telemetry, you may also be able to pull lipo voltage from there. I've never used it and not sure how reliable that is, but that option is there I believe for BLHeli32 ESCs.

did you change the display in the goggles to HD?