Uno R3 not detected
i have a "Make your own Uno kit", 100% official Uno R3 with a USB-C module, however it is no longer detected at all in Device manager. The power light is on etc. I have looked up and as far as I can see, it is the usb module that needs reset and reloaded in order to get the device detected by device manager again?
However, I don't know how to do that with this, normal R3's have the reset jumpers but this doesnt
19 Replies
Unknown User•4mo ago
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im unsure where the reset pin is on this usb module, the docs didnt mention it
Unknown User•4mo ago
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yeah but its soldered on, i cant read underneath it lol
trying to find a pic of the underside of this
theres a 3d model of it here! but im unable to rotate it properly to read it 😛 https://makeyouruno-visual.arduino.cc/#/uno
Unknown User•4mo ago
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yes but nothing gets detected
i can sort of see it
so it looks like that first pin, do i just short it to ground?
this doesnt mention the reset on the module, solely the tiny atmega16u2
however it is no longer detected at all in Device manager.I assume this means at some point, it was being detected in device manager, and now is not. What happened to the kit between the last time it was detected and the first time it wasn't detected? Where did you read that the USB module needs to be reset? Unless you've done DFU programming of the 16u2 to use it as a mouse/keyboard/joystick or other similar things, it's very unlikely that the USB module has lost it's programming "on it's own".
it's probably just my soldering then, but it looks ok! it worked, i did nothing with it for a while, and then one day i came back to it but it didnt work.
thanks @WeeGee
That's an odd one then, yeah.
From the pictures you sent, the soldering looks reasonable; I assume it's soldered on both sides yes?
(Arduino board AND usb serial chip?)
should also check and make sure
U2 and Q1 aren't swapped
those parts look REALLY similar, but I'm fairly sure one is a transistor and the other is a voltage regulator.
If you have a multimeter, that'd be your next step for diagnosis; see if the +5V rail is actually 5V when plugged into USBi have double checked u2 and q1, they are installed correctly, and i'm getting 4.6 something volts on the 5v rail
4.6v sounds like a diode drop between 5v Vusb and 5v
oh really? thanks for your help, i'll see if i can test that later!
still no word on the check between Q1 and U2; that'd be re-reading chip labels and quintuple-checking they're in the right places as the (I assume included) instructions say
swapping a voltage regulator into the wrong spot (and doing bad "+5V to the wrong pins of a chip") things could be why it worked very temporarily
checking all solder joints you personally soldered is also a good step
it's all fault finding!
i'll be doing some soldering tomorrow so i'll take another look at it! thanks again!