# Need Help Troubleshooting Failed First Flight Attempt Source: https://forum.modalai.com/topic/3108/need-help-troubleshooting-failed-first-flight-attempt Category: Development Drones (https://forum.modalai.com/category/44/development-drones) Tags: sentinel Posted: 2024-02-09 22:23:14 UTC by jmltt Replies: 2 · Views: 678 ## jmltt · 2024-02-09 22:23:14 UTC I was attempting a first flight with a Sentinel using a microhard modem for telemetry and a spektrum rc controller. I don't know if there have been any hardware updates to the Sentinel platform since this one was originally purchased (sometime in 2022? system image 1.3.1 was installed). It had just been flashed with the latest sdk v1.1.2. I've maintained the original camera calibration files but have recalibrated the other sensors whenever I've done a system update. I haven't changed much on the software side. I pushed a few simple services to it that weren't running at the time of testing (mocap server and a timesync service for the mocap server). I replaced the latest voxl-vision-hub with a version that has an additional offboard mode modeled after the figure-eight offboard mode. That also wasn't active at the time of testing. I was attempting to perform baseline testing to compare qvio performance and mocap, but I couldn't get the vehicle off the ground. It wasn't responsive to RC inputs when offboard mode was enabled while the rc was set to position/manual mode. After disabling offboard mode in the vvh config file and rebooting, the vehicle would respond to rc input but I could only get it off the ground momentarily before it would become unstable. Every time this happened the system would crash and reboot and I'd lose connection to QGC. I noticed the camera-server consistently had a really high CPU usage (up to and exceeding 100% at times). So I turned the camera-server and qvio-server off and tried to just get the vehicle in the air with gps control for the ekf. Same issue, no sustained flight and system is constantly crashing and rebooting. Can someone help me figure out how to start troubleshooting this? I followed all of the documentation you've provided on your website and the only modifications I've made are minor so I'm not really sure where to start. Thanks ## Reply by Alex Kushleyev (ModalAI staff) · 2024-02-13 17:30:50 UTC @jmltt can you please try a simple hover test without gps or altitude hold. Just use manual RC control for attitude and thrust. Are you able to share a px4 log from such test? Lets also double check ESC firmware and params: ``` #update voxl-esc tools apt-get update apt-get install voxl-esc systemctl stop voxl-px4 #stop px4 cd /usr/share/modalai/voxl-esc-tools/ ./voxl-esc-scan.py ./voxl-esc-verify-params.py ``` ## Reply by jmltt · 2024-02-14 16:23:26 UTC (in reply to Alex Kushleyev) @Alex-Kushleyev Thanks for getting back to me I can't fly again until tomorrow but I will upload the log after we attempt a hover test. We were actually able to fly on Monday and we could achieve stable flight in acro mode off a fresh battery but only for about 30 seconds. We're getting new batteries to see if that's contributing. Don't know why it would cause the system (or at-least PX4) to continuously crash/reboot though. Here are the results of the esc checks: voxl2:/usr/share/modalai/voxl-esc-tools$ ./voxl-esc-scan.py Detected Python version : 3.6.9 (default, Mar 10 2023, 16:46:00) [GCC 8.4.0] Found voxl-esc tools bin version: 1.4 VOXL Platform: M0054 Detected RB5 Flight, VOXL2 M0054 or M0104! INFO: Scanning for ESC firmware: /dev/slpi-uart-2, baud: 2000000 Sending library name request: libslpi_qrb5165_io.so Received standard error event 2 Sending initialization request INFO: ESC(s) detected on port: /dev/slpi-uart-2, baud rate: 2000000, protocol: firmware INFO: Verifying ESC Params.. INFO: ESC Information: INFO: --------------------- ID : 0 Board : version 31: ModalAi 4-in-1 ESC V2 RevB (M0049) UID : 0x2033393953435708003A0048 Firmware : version 39, hash d4fe8e3d Bootloader : version 183, hash 0a80a32a Params : ../voxl-esc-params/Sentinel_V1/Sentinel_V1.xml ID : 1 Board : version 31: ModalAi 4-in-1 ESC V2 RevB (M0049) UID : 0x203339395343570800340041 Firmware : version 39, hash d4fe8e3d Bootloader : version 183, hash 0a80a32a Params : ../voxl-esc-params/Sentinel_V1/Sentinel_V1.xml ID : 2 Board : version 31: ModalAi 4-in-1 ESC V2 RevB (M0049) UID : 0x2033393953435708003A004F Firmware : version 39, hash d4fe8e3d Bootloader : version 183, hash 0a80a32a Params : ../voxl-esc-params/Sentinel_V1/Sentinel_V1.xml ID : 3 Board : version 31: ModalAi 4-in-1 ESC V2 RevB (M0049) UID : 0x2033393953435708003A0056 Firmware : version 39, hash d4fe8e3d Bootloader : version 183, hash 0a80a32a Params : ../voxl-esc-params/Sentinel_V1/Sentinel_V1.xml --------------------- voxl2:/usr/share/modalai/voxl-esc-tools$ ./voxl-esc-verify-params.py Detected Python version : 3.6.9 (default, Mar 10 2023, 16:46:00) [GCC 8.4.0] Found voxl-esc tools bin version: 1.4 VOXL Platform: M0054 Detected RB5 Flight, VOXL2 M0054 or M0104! INFO: Scanning for ESC firmware: /dev/slpi-uart-2, baud: 2000000 Sending library name request: libslpi_qrb5165_io.so Received standard error event 2 Sending initialization request INFO: ESC(s) detected on port: /dev/slpi-uart-2, baud rate: 2000000 INFO: Params from ID 0 match ../voxl-esc-params/Sentinel_V1/Sentinel_V1.xml INFO: Params from ID 1 match ../voxl-esc-params/Sentinel_V1/Sentinel_V1.xml INFO: Params from ID 2 match ../voxl-esc-params/Sentinel_V1/Sentinel_V1.xml INFO: Params from ID 3 match ../voxl-esc-params/Sentinel_V1/Sentinel_V1.xml INFO: Success! Params in all ESCs are valid and identical. Let me know if you'd like me to look at anything specifically in the flight logs from our previous attempts. Otherwise I'll follow up tomorrow after our next attempt. Thanks!