Recent content by quaddamage

The RC connects to the AC and to mobile device, you should be more precise in regard to which connection doesn't work. If unsure, it's good to describe symptoms in addition to your assessment. If your mobile connection doesn't work, first step is to check the parts of said connection for which...

They tried to expand the protection, by allowing the app to disable your drone (disallow starting motors) if not upgraded. Simple software-based downgrade protection was there from the beginning, I think. More advanced protection - by burning fuses - was not possible in Phantoms because the...

I remember there were threads about downgrade, you must've found a wrong one if there are no answers. That's news to me. As far as I remember (sine 01.07.x), the Ambarella application (which is responsible for upgrade process) compared version numbers and only allowed modules to go up with...

We're talking about signal wire. Such things are fixed by thin jumper wires, typically 0.25mm - 0.07 mm copper diameter. How that translates into American Wire Gauge units - will leave the conversion to you.

UART data lines will not get damaged by a short to ground.

Then there really could be an unwanted short. While this may vary, most UART implementation are high when idle. Meaning you should get either 3,3V or 5V to ground on the lines, high impedance on RX one and low impedance on TX. Then again, this may vary..

Note that these are logically not SDA and SCL (not I2C), but RX and TX (UART). It is possible that there is a PNP transistor which shorts TX to ground when turned off, to avoid floating signals being interpreted as something by the other side.

If you don't have precise probes for your multimeter, you can buy those cheaply from china. First check between the output connector and the proper uC pads. Then when you know the faulty one, try narrowing the distance, to figure out where exactly is the break point. Then you should fix that by...

Yeah, check the UART traces. They're clearly the culprit. There is slight possibility of UART being selectively fried within the uC, but it's not the most likely solution.

The battery sends an announcement before turning off. Then it is waiting for a response "ready to be turned off" before disconnecting MOSFETs. What you described is the situation when the battery sends the announcement, but no response comes.

That's all correct. In newer drones (newer than Mavic Pro), DJI stopped adding the micro-controller, and started modifying the BMS firmware instead to add the specific functionality they wanted.

You're confusing the chips.

Get it to fly, if that works then you could start thinking whether you want to add a camera and maybe FPV. The gimbal you have is Zenmuse H3-2D and as the type name suggests, it accepts Gopro Hero 3. But you can also buy a cheap mod to put any action cam with micro-USB there (like Hero 4)...

Wiki: Microcontroller Posted that in another thread just yesterday, seem relevant here as well: o-gs wiki: P3 Battery schematics Btw, is your battery button working, like doing something? Because if it is, then uC is actually working - as per the schematic.

Googled "phantom 2 RC teardown". The second link was: DJI Phantom 2 Vision RC Controller Antenna Mod Assembly and Disassembly