EveDrone Mk2

By peveleigh on Jul 17, 2020

13  649  6

This build is essentially the same as dave_c's micro long range build but with Betafpv 1505 motors and a TBS unify race vtx.

  • dave_c micro long range frame - ordered from cnc madness in Vancouver
  • flywoo goku 12a escs - flashed w/ jesc telemetry
  • flywoo goku f411 fc - running Betaflight 4.2 w/ rpm filters
  • betafpv 1505 3600kv motors
  • tbs unify pro race vtx - w/ truerc antenna
  • caddx tarsier camera - fpv and hd feeds have separate sensors/lens
  • tbs crossfire nano receiver - w/ immortal antenna
  • beitian bn-220 gps - for betaflight rescue mode
  • tattu 3S 850mah battery - swapped out the xt60 for a smaller xt30 connector
  • hq durable t4x2.5 props
  • vifly finder 2 buzzer - has a built in battery and will trigger if the tattu gets disconnected

Photos

Discussion

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ghostface   Aug 03, 2020  

Can you comment on the gps performance?
Is the gps working fine for you on your setup? the tarsier seems to generate a lot of noise that interfers with the gps signals frequency.

peveleigh   Aug 04, 2020 

I couldn't get a GPS fix with the tarsier powered up but could if I only provided power over the FC's USB. I ended up moving the GPS to a new front mount and removing the wifi antenna and heat sink from the tarsier. Moving the GPS and removing the wifi antenna provided small improvements. Removing the heat sink provided the biggest improvement. It works great now (I get and maintain 14-15 sats easy). I couldn't say if a different combination of those things would achieve the same result or not (ex. only removing the heat sink). I used the GPS page in the betaflight configurator and the satellite signal strength shown there for reference between each change.

ghostface   Aug 05, 2020 

Thanks for getting back to me!
Any problems with overheating when not using the heatsink? We are pushing 30°C here and I am not sure if this would be a good idea.
What's the front mount you used? Is it this one: https://www.thingiverse.com/thing:4128166 ?
If not, could you please share it with me to give it a try :-)

ghostface   Aug 05, 2020 

Ok so your comment about removing the heatsink helping the most had me re-investigate this issue again in more detail.
I think i know what the problem now is. Initially I had 0 sats as soon as I turned on the tarsier, switching the stack mounts to nylon to avoid the frame being grounded by the tarsier mounting holes helped alot and I was only dropping a few sats then but signal was still rather unstable during flight.
I know made another test with the heatsink literally a tenth of a mm away from the tarsier, just so that it doesn't make contact and grounds and i am not loosing a single sat even when testing from my window and with the gps sitting right on top of the tarsier.

I am convinced the tarsiers ground is poisoned with noise and the heatsink is distributing this noise towards the gps causing the issue.

I am going to try a few different ways to not have the heatsink connected to the ground pads but still connected to the heat generating chips to avoid this, possibly simply flipping the heatsink might be enough - one side is coated with some non-electrically conductive paint but if you happen to have a scratch on there it could bridge a cap or some other component on the pcb so I am not entirely happy with that approach. Maybe some super thin plastic spacers on the mounting holes.

I tried conformalcoating the mounting holes but the immense heat of the tarsier appears to melt it after some time or something and its grounded again.

apexfpv   Jul 26, 2020  

Flight time? I wanna try those motors and was wondering how efficient they are.

peveleigh   Jul 30, 2020 

I can get 11.5 mins just cruising around the backyard. Haven't tried any real long range yet.

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