Flight Core

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  Taranis Q X7
  • Moderator  

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  The 5VDC and GND are pulled off of here. That said, you see there's a single RX line from receiver into RC input, this is how we are getting the RC channels, but there's nothing coming out of the system as far as telemetry. So basically with this setup, I don't expect telemetry coming out over RC, only control going into it.
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  LiDAR not showing up via I2C on J13
  • Ansel Misfeldt  

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  @modaltb Interesting, that's good to know they should be identical (what I assumed), that's why I was puzzled when it didn't seem to work. On VOXL Flight we're using port J13 and it's always worked perfectly without issue the first time we're wired up a new unit. I have not tried starting via the command line, but that's a good idea to try. My best guess is a loose connection in the wiring somewhere or a pin not making good contact on the board. If it should be working the most obviously problem is user error on our part or something not making contact properly. We ended up sending them one of our VOXL Flight units where we knew it worked perfectly each time instead of using the Flight Core because they were in a rush to get things working. Thanks for the suggestions!
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  Fried Unit
  • simo  

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  We test all of our PCBs thoroughly before they are shipped. We do ship the PCBs bare though, which means they are susceptible to ESD and other damage. We really can't warranty against how different people may handle the PCBs. We publish handling instructions that are also shipped with the PCBs, found here An issue many run into with Flight Core is that they plug USB into the Spektrum port and fry the board. The RMA diagnostic process is for ModalAI technicians to spend time looking into the root cause of the failure, and then provide analysis on what to do next.
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  Motors not responding to Throttle
  • Adarsh96  

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  @Adarsh96 Hey there, reading your issue reminded me of something I once experienced. EKF not initializing position is a separate issue but I can tell you if you're able to arm the quad amd have the motors spinning, it should be good. What flightmode did you arm it in? Because with some you need to raise throttle above 60% to takeoff. Just a thought but you might have just been in the wrong mode bc quad arming means you're basically ready to fly.
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  Error communicating with bootloader
  • czarsimon  

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  Indeed it was the diodes! I was able to fix one board by bridging the pads with some solder, the other one had the pads completely gone. Very strange, the flight cores are powered by the VOXL with the serial pins connected as well, but I don't see how that could cause hardware damage?
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  Get vehicle attitude
  • Andrew Keefe  

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  Ah, when I run the PWM program there is no chatter on the PWM signals, so I'm going to review that code again and compare it to mine.
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  BAR30 on Flight Core
  • Andrew Keefe  

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  I know this is kinda an old post but I have created a driver for px4 that can use both flavors of the MS5837 the bar2 and bar30. I will create a pull request with px4 so it will be available.
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  PWM
  • Andrew Keefe  

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  Well, we aren't routing the 5V on that little M0022 board to prevent it being used to drive servos (for this concern). But 5V does come down to the connector, so it could be soldered to, and you could create solder bridges on the bottom of the board. Not ideal, but 5V is there, just not routed....
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  Programming via RF
  • Andrew Keefe  

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  Hey @Andrew-Keefe , This isn't something I've tried. Curious as to what the setup looks like if you're up to share more details. Thanks, Travis
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  Serial read is blocking
  • Andrew Keefe  

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  Hi @Andrew-Keefe, I'm not positive on this one. I have an example of using UART for an ESC here, and I remember having to be careful what task was opening the UART port: https://github.com/modalai/px4-firmware/blob/modalai-1.11/src/drivers/uart_esc/modalai_esc/modalai_esc.cpp#L736 Here's opening of the port (note: this is beta level code) https://github.com/modalai/px4-firmware/blob/modalai-1.11/src/drivers/uart_esc/modalai_esc/modalai_esc_serial.cpp#L48
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  Flight Core LEDs
  • Andrew Keefe  

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  Thank you @modaltb. I was able to control the LED with my code (yellow = waiting for serial, blue = data valid, red = data not valid).
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  Get custom module to autorun
  • Andrew Keefe  

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  Thanks @modaltb , that worked! I had to set it to run as a background function using the &. It's running perfectly now. I probably want to rewrite it as a task, but that example code looked tough to follow. I wish the PX4 developer manual included more step by step tutorials, like the ROS tutorials.
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  CANbus implementation for new sensor
  can uavcan • • Andrew Keefe  

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  Hi Andrew, We have other folks using it for controlling ESCs, let me try to see what I can find as far as examples, we don't have one in our repos. PX4 itself has a UAVCAN implementation they've been working on that might be of help: https://dev.px4.io/master/en/uavcan/index.html Thanks! Travis