Hi, we are using OpenMV RT1062 Cameras in our robot. we have 2 of the R4 type. The first camera failed a week ago when it stopped detecting on our laptops and started heating up. With a voltmeter it outputs 1v on the 3v3 rail. It heats up from the bottom side and the led glows dimly green and red.
The second camera failed yesterday when it would run any code that didn’t use the image sensor (eg.blink sketches). But any sketch that uses the sensor would fail with the error: RuntimeError: Frame capture has timed out. We tried replacing the image sensor with others we have from the other RT and previous H7 units.
For Camera 1 we have tried:
Isolating the short (near impossible without a thermal camera)
Supplying external 3.3v (It increases heating but leds get brighter)
For Camera 2 we have tried:
Interchanging sensors from other RT and an H7, neither worked same issue.
Tested all sensors on a functional H7 (All of the sensors work)
Cleaning the camera with electrical contact cleaner
Additional Info:
Both were bought around 4 months ago from the official OpenMV store
both units were in an enclosed robot and only sent UART signals and got 5v on its VIN pin.
Both are R4
Thanks,
Youssef Shaalan
Hi, the systems do not die randomly. The behavior you are seeing only happens when there’s damage to the system electrically.
Were the UART signals 3.3V or 5V? The RT1062 is not 5V tolerant. The H7/H7 Plus are though.
They were 5v logic. But is it enough to cause damage. The camera is the one transmitting the other end doesnt send any data.
Yeah, but if you connected both RX and TX, then the TX line to the camera would be high, normally applying 5V to the I/O pin on the RT1062, which will fry the processor slowly and then all 3.3V logic.
I understand but in a previous post (OpenMV RT1062 with Arduino Mega - #11 by sejin) you stated that the RT1062 has built in 100ohm filters to prevent mcu damage. Doesnt that protect it from the 5v signal
No, it does not. That was just to limit short circuit current. So, if you connected to 3.3V or GND with an I/O pin it would be okay.