Piromoni o-tron HAT suddenly stop working on Raspberry, Pi 3 model B+ without any discernible reason

Support
1

Hi,

I have a
Raspberry, Pi 3 modello B+ bought on amazon and your piromoni o-tron HAT.

Display works well for many days receiving data from my custom python program. Suddenly stops showing any messages and backlight does’t work anymore with none reason. If a run a demo compare this message:

pi@raspberrypi:~/Pimoroni/displayotron/examples/dot3k/advanced $ sudo python backlight.py

Traceback (most recent call last):

File “backlight.py”, line 5, in <module>

import dot3k.backlight as backlight

File “/usr/local/lib/python2.7/dist-packages/dot3k/backlight.py”, line 1, in <module>

import sn3218, colorsys, math

File “/usr/lib/python2.7/dist-packages/sn3218.py”, line 114, in <module>

enable_leds(0b111111111111111111)

File “/usr/lib/python2.7/dist-packages/sn3218.py”, line 62, in enable_leds

[enable_mask &amp; 0x3F, (enable_mask &gt;&gt; 6) &amp; 0x3F, (enable_mask &gt;&gt; 12) &amp; 0X3F])

IOError: [Errno 121] Remote I/O error

I have tried to install again os and piromoni libraries as showed in your instructions and upgrade os, but nothing was solved !!

My version of raspberry is :

RASPBIAN STRETCH WITH DESKTOP

Version: June 2018

Release date: 2018-06-27

Kernel version: 4.14

with command uname -a I obtain this string of Kernel version:

Linux raspberrypi 4.14.52-v7+ #1123 SMP Wed Jun 27 17:35:49 BST 2018 armv7l GNU/Linux

My question is I have a defected Raspberry ? or is your display O-tron HAT defected ? or either damaged ?

Help me please, because if either rpi or o-tron have been damage for any reason i tried to give back both to amazon.

Thanks in advance

Bye

2

The IO error sounds like an i2c issue. What do you get if you run sudo i2cdetect -y 1

3

You’ll need “i2cdetect -q 1” to see the sn3218 (LED driver) because it’s write-only.

These problems don’t crop up often so I’m not sure which device is at fault. Have you tried any other HATs or pHATs?

4

this is the result of command !

i2cdetect -q 1
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-1 using quick write commands.
I will probe address range 0x03-0x77.
Continue? [Y/n] y
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – – – – – – – – – – – – –
10: – – – – – – – – – – – – – – – –
20: – – – – – – – – – – – – – – – –
30: – – – – – – – – – – – – – – – –
40: – – – – – – – – – – – – – – – –
50: – – – – – – – – – – – – – – – –
60: – – – – – – – – – – – – – – – –
70: – – – – – – – –

What does it mean ? It’s a faulty display ?

5

here is the result of the command you suggest to launch.

pi@raspberrypi:~ $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – -- – -- – -- – -- – -- – -- –
10: – -- – -- – -- – -- – -- – -- – -- – --
20: – -- – -- – -- – -- – -- – -- – -- – --
30: – -- – -- – -- – -- – -- – -- – -- – --
40: – -- – -- – -- – -- – -- – -- – -- – --
50: – -- – -- – -- – -- – -- – -- – -- – --
60: – -- – -- – -- – -- – -- – -- – -- – --
70: – -- – -- – -- – --

What do i observe from this ?
Thanks

6

It means its not being detected, nothing is being detected on the i2c bus.
Did you run sudo i2cdetetct -q 1, I think it has to be run as sudo?

7

certanly i ran sudo i2cdetect -y 1 but the result is the same !! In your opinion what’s your advice ? to change just raspberry or just sidplay o-tron or both ?

Thanks

8

Ok, was just double checking, sometimes its hard to tell what another persons skill level is. ;)
If it was me, just to rule out a software issue, corrupt files etc. I’d flash a fresh image of Raspbian on your SD card and run the display O tron installer again. Maybe even use a different SD Card. I think I’d also remove the display O tron and reseat it, if you haven’t already. If you have the same results after that its almost certainly a hardware issue. @gadgetoid can help more with that, how to diagnose it etc.

9

I’m just couscous,is it a display-o-tron 3000, the display o-tron hat ,or something else altogether

10

my own version of display is o-tron hat

11

ok,mine too, i didn’t think the dot3k worked for me either,i was think that maybe they were only for the display -o-tron3000 but i could be wrong ,when i get a chance i’ll try the one you are trying to use, maybe i’ll have time tomorrow evening …

12

checked mine and its works fine …I must have 2 accounts

13

ok thanks for your checking out…i have already given back damaged display for refunding and then i’ll buy another one !! hoping to be luckier with new one !!
:-)

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