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astro-pi / python-sense-hat

Source code for Sense HAT Python library
https://sense-hat.readthedocs.io/en/latest/
BSD 3-Clause "New" or "Revised" License
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SenseHAT all LEDs On with Hardware Not Found #97

Open avishek-rc1 opened 5 years ago

avishek-rc1 commented 5 years ago

Description: This was working perfectly earlier. All of a sudden, when Pi boots up all LEDs are on and nothing happens. Read a lot of forums but no specific answer. Please help.

Error: Traceback (most recent call last): File "/home/pi/Projects/SenseHat/sensehat_sensing.py", line 2, in sense = SenseHat() File "/usr/lib/python3/dist-packages/sense_hat/sense_hat.py", line 39, in init raise OSError('Cannot detect %s device' % self.SENSE_HAT_FB_NAME) OSError: Cannot detect RPi-Sense FB device

Attached: vcdbg log msg and dmesg vcdbg.txt dmesg.txt

XECDesign commented 5 years ago

All on meaning all white or a rainbow pattern?

It sounds like a hardware issue. The Pi is unable to communicate with the Sense HAT, so there's not much to go on.

avishek-rc1 commented 5 years ago

Its a rainbow pattern. Does this mean the HAT is destroyed? Is there a workaround? Changing the breakout pins etc.?

XECDesign commented 5 years ago

I don't know if it's destroyed or if there's just dirt in the connector. Without knowing what's actually wrong, there's not much that can be done. If it's still within the warranty period, you could try to RMA it.

bsimmo commented 5 years ago

Try removing and reconnecting it a few times. You could also take the black cover off the pin protection and check it contacts well.

If that fails then force detection with add dtoverlay=rpi-sense in sudo nano /boot/config.txt reboot

The only time I've seen mine do this is when not enough power could be provided to a Pi3B+

On Mon, 15 Jul 2019, 2:41 pm XECDesign, notifications@github.com wrote:

I don't know if it's destroyed or if there's just dirt in the connector. Without knowing what's actually wrong, there's not much that can be done. If it's still within the warranty period, you could try to RMA it.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/RPi-Distro/python-sense-hat/issues/97?email_source=notifications&email_token=ACYAXNZ7MPJEZZJBGWIDQP3P7R47ZA5CNFSM4IDP7YYKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODZ5XFUY#issuecomment-511406803, or mute the thread https://github.com/notifications/unsubscribe-auth/ACYAXN7HCMTRL7HNOS3ISOLP7R47ZANCNFSM4IDP7YYA .

bsimmo commented 5 years ago

Ah a quick look through you dmesg, the sense fails to be detected when it tries, are you powering via OTG-USB? Anyway, undervoltage etc at the end.

Same reason I had, not enough power during boot time. Sort your power out. See if it works.

avishek-rc1 commented 5 years ago

Thank You Ben. I am powering using the standard 5v/2.5a power outlet only. Also, the dt-overlay seems to be added in my config. Attaching a copy of it. config.txt

bsimmo commented 5 years ago

It'll still be power, mainly because it is warming you. The 3B+ seems very sensitive to anything during boot and the SenseHAT just stretches it too much, perhaps the LEDs just draw that but too much and make the Pi PSU drop out with a spike. But I can confirm you are not the only one, as it happened to me.

You could try the newer Buster setup and see if that has a better boot up sequence. That is if you have no other PSUs to try. (Yes iirc mine was an official one too).

On Mon, 15 Jul 2019, 4:26 pm avishek-rc1, notifications@github.com wrote:

Thank You Ben. I am powering using the standard 5v/2.5a power outlet only. Also, the dt-overlay seems to be added in my config. Attaching a copy of it. config.txt https://github.com/RPi-Distro/python-sense-hat/files/3392957/config.txt

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/RPi-Distro/python-sense-hat/issues/97?email_source=notifications&email_token=ACYAXN7E47TZJUTVYSRRBX3P7SJI5A5CNFSM4IDP7YYKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODZ6BO3A#issuecomment-511448940, or mute the thread https://github.com/notifications/unsubscribe-auth/ACYAXN5647BAH75BTDEE2WLP7SJI5ANCNFSM4IDP7YYA .

avishek-rc1 commented 5 years ago

Thank You Ben, I will try with a new PSU first and if it still fails, would try with Buster. Might take a day or two to respond on this thread again.

bsimmo commented 5 years ago

For reference

[    4.459523] rpi-sense 1-0046: Read from reg 240 failed
[    4.459578] rpi-sense: probe of 1-0046 failed with error -22
[    4.884412] uart-pl011 3f201000.serial: no DMA platform data
[    5.119991] random: crng init done
[    5.120011] random: 7 urandom warning(s) missed due to ratelimiting
[    5.397594] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[    5.397614] brcmfmac: power management disabled
[    5.592001] Under-voltage detected! (0x00050000)

And then at the very end of dmesg, some in and out of voltage messages.