FC: Matek H743 Slim  V 1.5
4in1 ESC: Hobbywing XRotor Micro 60A 6S 4-in-1 BLHeli32 ESC


INAV 4.1
BLHELI_32

I asked a few questions on here a while ago regarding a different build and got great help so I thougt I would try again.

I have a new H743 slim and I flashed INAV 4.1.  I then repinned the JST to get the pins in the right order to go from the ESC to the FC.  When I plug in a battery, I get the 3 tones from the ESC and the FC lights up but I don't get the final 2 tones and when I connect the FC to my laptop to try and run BLHELI Suite, the BLHELI Suite won't connect.  


There is an RX8 coming out of the FC but I don't think that needs to go anywhere to the ESC but I could be wrong.  

Also, the FC feels warmer to the touch than I think it should but I have never used this type of FC before so I could be wrong.  It very warm but not too hot to hold or anything like that.

Any help or suggestions would be great.

Anyway, thanks in adavance.

J

You have a 32 bit ESC and should be using the Blheli_32 configurator. Double check this.

Only 3 tones form the ESC mean that the ESC has not detected the MCU on the FC. Double check the pinouts on both the ESC and FC.

The FC powering up means it is receiving voltage from the ESC.

However the FC lighting up but the ESC not detecting it can be an issue with the wiring harness/connector or a fatal situation where the MCU is dead (this is also associated with the observation you have of the FC heating up fairly hot to the touch very quickly).  

I think you are going to need a multimeter to sniff around for continuity and voltages and find what is wrong with the FC. A damaged power regulator is a relatively simply soldering fix but a dead MCU means you will need a replacement MCU during the current global chip shortage.

The ESC you have does not have a telemetry pad and thus the RX pin from the FC does not need to be connected to anything. ESC telemtry over DSHOT is supported by BLHeli_32 and is much faster than telemetry over a wired uart.

Thanks for the great response.  I played with several Inav setting regarding the mixer and configuration and now I get all 5 tones which is cool and I can spin 3 motors but motor #4 won't spin and is not being detected in BLHELI_32 but the other 3 are being detected.  

After the initial 5 tones, a few seconds go by and then I get 1 tone and then  2 quick tones.  

I think you are correct that it is the pins.  How much voltage should be coming out of there?

Thank you so much and I wlll look into configurator

If you take a multimeter in DC voltage mode and measure voltage between the GND pin and the rest you will have:

VBAT= Lipo battery voltage (be careful)
5v is obviously 5v
Motors pins (M1-M4) will be 3.3v

Based on what you are saying it seems that the MCU is not dead on the FC which is very good news.

If BLHeli_32 suite is not detecting Motor 4 then:
- Check the pins in both connectors at ESC and FC to ensure the connector pins are not bent
- Without plugging in a lipo or connecting the FC to your computer, put your multimeter in continuity mode and measure the continuity from the M4 pin at the back of the connector on the ESC and the M4 pin on the back of the connector
- Also check the motor pads on the ESC with a magnifying glass to ensure you don't have any shorts.

Ended up being a bad pin on wire. Thanks

Good to know you sorted the issue.

Happy flying.