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
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.
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…"
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…"
"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."
"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…"
"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 &…"
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…"
"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…"
"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."
"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."
"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…"
"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…"