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raspberrypipress / official-raspberry-pi-beginners-guide-5e

Code and resources for The Official Raspberry Pi Beginner's Guide, 5th Edition from Raspberry Pi Press
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[Errata]: Weirdness during experimenting #5

Closed Rueful-Pi closed 2 months ago

Rueful-Pi commented 4 months ago

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Print

What language of the book has this error?

English (EN)

Page Number or Section

pg 171 Physical computing with the Sense HAT

Detailed description

Not sure if this belongs in "Issues" but, I didn't see a general discussions tab.

During experimenting as suggested on page 171, I found that the LEDs turned off with any RGB value of 47 and below. So, "sense.clear(47, 47, 47)" would turn the panel off, while (48, 48, 48) would show a much dimmed white. Is this an error or just voltage too low for LEDs to operate? Curious, indeed.

bjepson commented 4 months ago

Thanks, @Rueful-Pi. There is an Astro Pi forum that is used for discussions of the Sense HAT itself, and someone on that forum may have some insights: https://forums.raspberrypi.com/viewforum.php?f=104

There is also a GitHub repository just for the Python API, in case this is an issue with the Python API and not with the hardware. There is a closed discussion about the _pack_bin method that handles the RGB colour values, and this may illuminate (pardon the pun) things: https://github.com/astro-pi/python-sense-hat/issues/31

Best,

Brian

Rueful-Pi commented 4 months ago

Thanks @bjepson for the info and links will definitely check all that out.