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Found 7 results

  1. Finally real success! I got back out there this week with a fully waterproofed servo, an added lidar sensor and a major code overhaul based on Test Flight 1's test data. Observations were: 1) Pitch control is now much better. While I still think the control loops could be better tuned, I am now getting long runs with very good pitch stability and no more porposing as you get with the wand-based systems. In lighter air, I suspect that the lack of paddle / wand drag will allow me to fly more easily as well. 2) Servo waterproofing worked great. 20 knots of wind and lots of spray
  2. Hey team, just shot a quick video on my solution to adjusting altitude and some of the other prototype variables. First flight is TODAY!
  3. Another update from the land of digital flight control systems! Integration I now have all sensors talking to the Grand Central board and the algorithms (PID loop, ultrasonic sensor filter and smoothing, etc.) performing as designed. The wireless remote is also working and allowing the user to adjust PID Parameters, Altitude Setpoint, and Smoothing coefficients. The LCD is putting out status messages and feedback when the user is changing parameters. I am also collecting all the data from accelerometers, gyros, ultrasonic sensor, battery cell voltages, etc. and storing it to an SD ca
  4. Another quick update, A productive weekend ended up with an IMU (BNO055) and a waterproof sonar range sensor (JSN-SR04T) being integrated to my Arduino Mega board. Both are yielding good data and easy to work with. I also am able to write commands successfully to a spare servo I from an RC Tricopter. I am still in the process of selecting the correct servo and identifying the correct attachment point(s) for the servo to flap linkage (please see and comment on servo math below). Additionally, I now have a PID library running giving servo commands based on the measured elevation.
  5. Time for another blog installment of the Digital Flight Control System for my UFO. I have been busy at work on the project and making good progress toward a first flight in early 2020! Also attached is an updated block diagram with details on various subjects below: Data Logging: In my last blog post I mentioned that we needed some sort of data logging to really get into the meat of how well our control and filter algorithms are working. Post processing data after getting off the water will also allow us to see if there is data being generated by sensors that could improve
  6. Good news! I just received PCBs back from the fab house and all parts fit. This simply means I know how to be very detail-oriented with a pair of calipers and my CAD software. I mentioned in a previous post that mounting all of the modules to a single PCB was easier and more electrically sound than using a "base plate and flying wire" approach. The PCBs are back and everything fits mechanically. As you can see from the photo, I have added 0805 inline footprints on every trace. The idea here is that if the trace is correct, I install a zero-ohm resistor and carry on. If a trace ends
  7. Ok team, here goes my first blog post. My goal here is to build a Digital Flight Control System (DFCS) for my UFO using a sonar range sensor as opposed to the wand. The design needs to completely mimic the performance of the wand system currently in the boat. The system needs to be fully removable to allow for One Design Racing if desired. A few design guidelines... Improvements to current control system: 1) Sensing wave terrain out ahead of the boat 2) Not engaging the mainfoil flap until the boatspeed hits 7 knots to reduce drag while floating 3) Toggle settings
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