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Hey there, Henk,
I believe @Sqwawker’s right on both counts. The RTC module has an I2C address of 0x52 not 0x29. If your communicating with 0x29 you will receive an Errno5 Input / Output regardless of the library you use.
That by itself would explain the re...
One thing I’d also check is the audio file itself. Some boards and libraries can be picky about sample rate, bit depth, or the way the MP3 was encoded. I’ve had audio issues disappear after re-encoding the file with more standard settings.
If you’re testing different audio files, mp3louder.org ...
It might also be worth checking for a floating input or wiring issue around the button. I’ve had a Pico behave unpredictably before because a pull-up/pull-down resistor wasn’t configured the way I expected.
We explicitly scanned:
GP4/GP5 → returned [82] (0x52 decimal → 0x29 hex)
GP0/GP1 → returned nothing
If you’re scanning an i2c bus and its returning decimal 82 than thats hex 0x52, not 0x29, which would match with the PiicoDev Docs a...
For really long-range QR scanning, the optics and camera resolution usually become the limiting factors rather than the QR decoding itself. A decent zoom lens and good lighting can make a huge difference.
When I’ve been testing QR readability at different distances, I’ve sometimes used scannr.net ...