[SOLVED] Displayotron Hat IOerror[Errno 5]

Discussion Raspberry Pi
1

When I run backlight.py (sudo ./backlight.py) I get the following error:
Traceback (most recent call last):
File “./backlight.py”, line 9, in
import dothat.backlight as backlight
File “/usr/local/lib/python2.7/dist-packages/dothat/backlight.py”, line 1, in
import sn3218, colorsys, math
File “/usr/local/lib/python2.7/dist-packages/sn3218.py”, line 112, in
enable_leds(0b111111111111111111)
File “/usr/local/lib/python2.7/dist-packages/sn3218.py”, line 60, in enable_leds
[enable_mask & 0x3F, (enable_mask >> 6) & 0x3F, (enable_mask >> 12) & 0X3F])
IOError: [Errno 5] Input/output error

When I hello_world.py (sudo ./hello_world.py) it works OK.

I’m using 3.12.35+ #730 PREEMPT Fri Dec 19 18:31:24 GMT 2014 armv6l GNU/Linux

2

My futher discovery is:
The broblem looks like to be in the backlight module. Each time I import the module I get the message.
So where do I have to correct?
Or is there a new backlight module?

This error lookslike that at: Display-O-Tron HAT i2c problem
I have tried to reactivate i2c and reboot and run the backlight.py-program and still get the error.

3

your kernel is a bit oldish but I don’t suspect that’d be a problem… how did you install the dothat lib?

4

I used this command:
curl get.pimoroni.com/dot3k | bash
and I get the following result:
/home/pi/Pimoroni
/home/pi/Pimoroni/dot3k
/home/pi/Pimoroni/dot3k/dot3k
/home/pi/Pimoroni/dot3k/dothat
/home/pi/Pimoroni/dot3k/dothat/advanced
/home/pi/Pimoroni/dot3k/dothat/basic
/home/pi/Pimoroni/dot3k/dothat/basic/backlight.py
/home/pi/Pimoroni/dot3k/dothat/basic/graph.py
/home/pi/Pimoroni/dot3k/dothat/basic/hello_world.py
/home/pi/Pimoroni/dot3k/dothat/basic/room.py
/home/pi/Pimoroni/dot3k/dothat/basic/touch.py

I hav tried to reload the the program but I always get the same error.

5

What happens if you:

i2cdetect -y 1

What Raspberry Pi is it btw?

6

The Raspberry Pi is Model B+ V1.2
Result of i2cdetect -y 1
pi@Caligula ~/Pimoroni/dot3k/dothat/basic sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- pi@Caligula ~/Pimoroni/dot3k/dothat/basic

7

hum, the HAT should give you a different fingerprint… are you sure you are using the Display-o-tron HAT and not the display-o-tron 3000? if so you should use the examples in the dot3k/dot3k directory.

8

I’m using Displayotron Hat.

I change the DisplayOTron Hat to an other Raspberry Pi B+.
I install nessecery programs and run backlight.py
Voila! It run OK.
My conclusion is that either is the first RPi doesn’t work corectly or for some reason the program failed/loaded wrong.

9

You could try to use the SD in your other Pi, that should confirm that your Pi is OK.

I have noticed in your listing that there is a file that is not in the repo:
/home/pi/Pimoroni/dot3k/dothat/basic/hello_world.py

Perhaps it used to be, but that would suggest you may have an older version. You could try to re-run the installer answering ‘yes’ to all questions requesting to reinstall.

… other than that I’m not sure, but my hunch is that i2c is failing as the reason for my earlier question was that I was expecting the captouch chip to show up in 0x2c.

Edit: I see you already tried to reinstall.