"You do get that 5.8 ghz is the worst decision you could make?
Power loss due to distance is directly related to frequency. Higher frequency means less distance for a given power. This is why 802.11A sucked, has sucked and always will suck at 5ghz.…"
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Vernon Barry
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Vernon Barry's Groups
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Vernon Barry's Discussions
Proposed safety changes here in the forum
Started this discussion. Last reply by Jake Stew Aug 13, 2012. 8 Replies 0 Likes
Look, I'm sorry. It's a pet peeve of mine that people post here, telling me they have knowingly flown out of range of radio control of some method. Some have been so stupid as to make an FPV…Continue
Flashing 3DR ESCs or RC timer ESCs with MUCH better firmware
Started this discussion. Last reply by Vernon Barry Jun 13, 2012. 11 Replies 1 Like
Ok, so here's the basic deal. The stock firmware coming on the ESCs works as intended but is far less than ideal for use in our quads. The problem here is that due to startup sequence timing from…Continue
Vernon Barry's Page
Latest Activity
Vernon Barry replied to Frankie Davis's discussion Transmit photos while in air"Sorry but important things first. While in your head, it may seem logical to power everything from the main battery, Don't do this! Even a good engineer who fully understands all of the electrical problems would see that the risk involved from…"
Vernon Barry replied to Randy's discussion ArduCopter 2.8 / 2.8.1 released"Yes, rather than just saying RTFM, I tried to give you a little more info by providing the instructions in case you didn't have them and also show that particular ESC firmware is very common between several ESCs in that range.
Also,…"
Vernon Barry replied to Tom Petruzzelli's discussion Troubling Take Off in the group ArduCopter User Group"In general, when you are close to the ground, no aircraft/heli will stay in a single place because they create a vortex of spinning air that you are trying to balance the machine on top of. It's called ground effect.
This is why flying…"
Vernon Barry replied to Lloyd DeForrest's discussion Help- Compass deviates with increased motor current"My answer was and still is the same as Doug's, move the current sensor to the bottom near the battery to keep all high current wiring as far away from the APM as possible.
"I have the AttoPilot sensor but its location is very…"
Vernon Barry replied to Lloyd DeForrest's discussion Help- Compass deviates with increased motor currentVernon Barry replied to Lloyd DeForrest's discussion Help- Compass deviates with increased motor current"Why would you be at a loss? We know about this, there are about 100 threads on the subject. High DC currents make a magnetic field. The only way to counteract is to increase distance between the offending wires and the mag sensor. Also, twisting the…"
Vernon Barry replied to Tom Griep's discussion Setting UART2 on the APM2"This goes back to why. I'm not trying to be difficult, but this is just the wrong approach to a system. The APM and code is a work in progress and ultimately tuned for the best performance. Anything you do to modify the code does 2 things, hurt…"
Vernon Barry replied to Tom Griep's discussion Setting UART2 on the APM2"This is exactly what I was saying was possible, but no reason to need a second UART to do that. Most devices have low enough impedance that connecting more than one (say Xbee and OSD) were already being used by many with no problems off of a single…"
Vernon Barry replied to Tom Griep's discussion Setting UART2 on the APM2"Sorry, meant to say connect the RX pin at the APM. The pin labels are what the pin does at that device. In general, you connect the TX pin of one device to the RX pin of the other device. Sometimes, they are mislabeled (simple silkscreen…"
Vernon Barry replied to Tom Griep's discussion Setting UART2 on the APM2"No, again, follow what I said. You cannot ever have 2 devices trying to send Mavlink to the APM. You can receive mavlink on multiple devices. Changing to UART2 gains you nothing. You would always control via one or the other but not both at the same…"
Vernon Barry replied to Tom Griep's discussion Setting UART2 on the APM2"Yes, it says that in the directions."
Vernon Barry replied to Tom Griep's discussion Setting UART2 on the APM2"The question here is why? Further, clarification of the intentions. You surely do not intend to control via both UARTs? In other words, let's say you want to update parameters via the USB, but are driving for some reason a ground station or OSD…"
Vernon Barry replied to Rick Eis's discussion Why is the Voltage in Minimum OSD different then the voltage in Mission Planner?"http://code.google.com/p/minimosd-extra/source/browse/trunk/MinimOsd-Extra/ArduNOTES.ino?spec=svn5&r=1
Answers your question about second battery:
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Vernon Barry replied to Rick Eis's discussion Why is the Voltage in Minimum OSD different then the voltage in Mission Planner?"Betting that if you read the source code for the OSD, a "correction" factor is there manipulating the displayed value.
As to the why, well that's somebodies fix in the OSD code, but it's also designed to work with more than one…"
Profile Information
- About Me:
- My hobbies inlcude real turbine engines, lasers, cnc machines, 3D printers, and restoring classic cars. I fly RC helicopters, both nitro and electric.
- Tell us a bit about your UAV interest
- I'm just getting into the UAV hobby but have lots of experience with RC helis. I have good experience in programming in Arduino as well.
- Hometown:
- Charleston SC
Comment Wall (3 comments)
- At 10:46am on May 21, 2012,
James Dinh said… Hi Vernon,
I have APM 2. Everything worked great, flying great. Then, I had a crash. My fault, not the board. I crashed into a tree. Now, the board lights up fine when I plug it in via USB to my computer. All the LED lights show normal function. I get GPS lock, I can access Mission Planner, erase eeprom, load new codes (2.5.5), etc.
With the USB still in, if I plug in the lipo and arm the motors, I can throttle up and the motors spin normally. But as soon as I unplug the USB (lipo is still plugged in) the board goes dark and I get no response from the motors other then the dreaded continual beeps. Somehow, it seems that I'm not able to power the board via the output pins (jumper is in on the JP1 pin), but can power the board via USB.
I've checked all the soldering on all my wires going in and out of the PDB. I've visually checked the board itself. All the soldering looks good. I guess there are many things that could have damaged the board during the crash, but why does it work normally as described above? Any ideas or suggestions would be much appreciated. I miss my robot friend. :(
- At 11:17am on May 21, 2012, Alonso Rodriguez said…
James,
Make sure your jumper is still present.
I had something similar happen to me.
I thought it was the jumper but ended up being the diode (D1).
What I discovered is that D1 burned up on me.
Dont know how or why.
D1 is nearly impossible to replace as it sits just below the jumper.
What I ended up doing was soldering a wire from VCC to +5V.
Basically bipassing the diode.Hope this helps.
- At 9:32am on June 15, 2012,
Al Lowrie said… Have you had any problems resulting from the bipass thus far? Are you powering the APM from the Output rail only with the jumper in place? Thanks, Al
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