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Topic: Question about reversing I2C SDA and SCL (Read 371 times) previous topic - next topic


Jun 21, 2019, 04:42 pm Last Edit: Jun 21, 2019, 04:45 pm by stever58
I was hooking up an I2C lightning sensor board to my Arduino Uno, and I did a dumb thing and reversed the SDA and SCL lines.  Now when I plug my Arduino into my computer, it complains that a USB device is not recognized or has malfunctioned, and I can't upload a simple test program to it.  Could reversing the I2C lines have toasted my Uno, or is it likely some other problem?



Jun 21, 2019, 04:54 pm Last Edit: Jun 21, 2019, 04:55 pm by AWOL
It's possible, though unlikely to be caused by the swap.


Not caused by swapping the lines.

Does it detect if you disconnect the sensor?

If not, is it a genuine(or faithful clone with 16u2 loke official boards? The usb chip is easy to damage compared to cheap clones)? Did you abuse the power rails? How was it powered and what was connected to power and ground?
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Jun 21, 2019, 10:52 pm Last Edit: Jun 21, 2019, 10:56 pm by stever58
It's dead in the water, with or without the sensor, and I tested it at home and here at work so it's not my PC.  I think it's a clone, but it also *looks* like it has a 16u2.  It was hooked up and powered through the PC USB port, and the sensor was the only thing connected.

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