"@Chris,
We are always learning! I always take away some new tidbit of knowledge everytime I visit the Forum. A number of times I have been wrong, was corrected, but learned something in the process.
Just a thought.
Regards,
TCIII"
eyesopen45's Discussions
Ardupilot Mega v1.4 problems
Started this discussion. Last reply by Thomas J Coyle III Apr 7, 2011. 60 Replies 0 Likes
I have assembled a new APM from the diydrones store and uploaded the newest code for Jan.3 (1.01). When I have the APM/IMU installed in my Easystar, the PPM light flashes and the A B C light never go…Continue
eyesopen45's Page
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3D RoboticsChris Anderson replied to eyesopen45's discussion Ardupilot Mega v1.4 problems
"I stand corrected. I'm not the hardware designer, so I should shut up."
AdminThomas J Coyle III replied to eyesopen45's discussion Ardupilot Mega v1.4 problems
"@Chris,
I will have to disagree here with you. Jordi's v1.4 shows a common ground between the APM electronics and the servo header ground pins. There has to be a common ground between the servo header and the APM electronics or the board would…"
Ian Sexton replied to eyesopen45's discussion Ardupilot Mega v1.4 problems"Hi Chris,
Thanks for the swift response. I'm not sure that I follow you. Isolating the + rail makes sense but NOT the ground!
My point is that there is a common ground throughout the APM board but this is ONLY through the track which I…"
3D RoboticsChris Anderson replied to eyesopen45's discussion Ardupilot Mega v1.4 problems
"Hmmm. Nobody else has reported any issues with this that I know of, and there are about 5,000 APMs out there. Remember that the servo rail +- and APM power are electrically disconnected for safety, so there may be in some sense two grounds."
Ian Sexton replied to eyesopen45's discussion Ardupilot Mega v1.4 problems"APM PCB fault?
PS forgetting that this is a community project :(
If someone can send me a blank PCB I can check this, or maybe someone else can:
Connect a bench PSU with current limiting to the 0v on the I/O connector.
Set the current limit to 0.5A…"
Ian Sexton replied to eyesopen45's discussion Ardupilot Mega v1.4 problems"I've scoured this thread hoping to answer a problem of my own.
I think I may have found a fault in the PCB layout of the ArduPilotMega?. This is a little difficult to explain but I'll try.
I have a v1.4 PCB with attached oilpan &…"
eyesopen45 commented on Chris Anderson's blog post Anyone entering the Huntsville International Micro Air Vehicle Competition?"Thank you for the heads up on this one. I know what all my spare time will be going towards for the next few weeks."
The Old Flyer replied to eyesopen45's discussion Ardupilot Mega v1.4 problems"Hopper,
I would like to have Jordi verify this - but I believe the resistance between the SJ1 pad and the 5volt pad on the GPS should be a dead short. Any resistance between the two is the source of the problem. It may be a…"
Hopper replied to eyesopen45's discussion Ardupilot Mega v1.4 problems"I'm hearing you loud and clear, Irvin. I read your prior post several times. I pulled my XBee out of the loop with no effect. I measured the resistance between my SJ1 and the GPS port and got 90 ohms. Is that enough to pull the volts low enough…"
The Old Flyer replied to eyesopen45's discussion Ardupilot Mega v1.4 problems"I think there must be a break in the trace from SJ1 to the +5 trace. I soldered in a jumper wire from SJ1 to the +5V pad on the GPS port. All is good now! No resets.
I'v flown a very good 13 waypoint AUTO flight with a Katana."
3D RoboticsChris Anderson replied to eyesopen45's discussion Ardupilot Mega v1.4 problems
"I've never seen that problem before, so I'm not sure. Maybe you've got an especially weak BEC in your ESC? Maybe you're using super high-drain digital servos?
I'll bet if you upgrade your ESC you'll be fine."
Hopper replied to eyesopen45's discussion Ardupilot Mega v1.4 problems"I removed them one by one (Airlerons, Elevator, Rudder) and tried to boot APM from ESC power only.
Once I was down to only the throttle (which supplies power to the APM), it worked. The APM booted normally.
So, what does that mean? I…"
3D RoboticsChris Anderson replied to eyesopen45's discussion Ardupilot Mega v1.4 problems
"It could be that your ESC isn't supplying enough power and APM is browning out. Try disconnecting some servos. Does that make a difference?"
Hopper replied to eyesopen45's discussion Ardupilot Mega v1.4 problems"Yes. The APM boots fine, ABC LEDs show correct sequences, ending with B and C fully lit and I can do CLI, GCS, etc. But obviously, the servos don't move and the receiver does not receive anything from the (airtronics) transmitter until I turn…"
DistributorMartint BuildYourOwnDrone.co.uk replied to eyesopen45's discussion Ardupilot Mega v1.4 problems
"Hello hopper,
If you have no BEC or any other power connected to the boards, and plug in the usb do any of the leds light up on either board?
Regards
Martin"
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