Rasperri Pi + Runeaudio + LCD I2C 2004 20x4

dom_france

Hello,

First, I would like to thank you for this update version (this image) :
RuneAudio_rpi2_rp3_0.4-beta_20170229_2GB.img.gz

I tried it this week end, because, I would like to automatically play a playlist with MPC and a service when my Raspberri switch on, and with this image, OK for me.

After, I transfer a python script (name shutdown.pi) to switch off my rasperry pi 3, OK, very good too, my solution is OK.

Now, I would like to add a display, with I2C protocole, like LCD I2C 2004 20x4, and I need your help, because I can not start the order "i2cdetect -y 1" to scrut my electronic editing.

Thank you per Advance

Dom (from France)

RQ : sorry for my english, I'm french...

My question :
Raspberry Pi 3 + RuneAudio_rpi2_rp3_0.4-beta_20170229_2GB.img.gz + display LCD with I2C : how to do ?

Bye Bye

hondagx35

Hi Dom,

what is your exact problem?

To get I2C working you have to enable it in "/boot/config.txt" first

    dtparam=i2c1=on
    dtparam=i2c_arm=on

Next you have to install I2C-Tools :

pacman -S i2c-tools

And check this
#1191

Frank

Frank

dom_france

Hi Frank,

thank you for your answer.

First, I change my system file "/boot/config.txt" with "nano" and I added this :

dtparam=i2c1=on
dtparam=i2c_arm=on

install I2c-tools OK for me, like this :

And check this

Now, I'm going to read this post :
#1191

and in the coming days, I'll come back to you if I have problems

thank you....

Bye
DOM from France

dom_france

After install "i2c-tools" with pacman -S

I try this command to scrut my "I2C network", but without success :

i2cdetect -y 1

I have this error :

Error: Could not open file `/dev/i2c-1' or `/dev/i2c/1': No such file or directory

here is my screenshot :

why ?

in /dev directory, I don't see any module with "i2c"...

dom_france

Hello everybody,

today, I try to install "gcc" (because Adafruit library need gcc) but without success : no space enough on my system :

it's strange because my SD card is a 16GB... only 2GB for system...

Can someone help me step by step for the establishment of my display?

Thank you...

DOM

I use this version : RuneAudio_rpi2_rp3_0.4-beta_20170229_2GB.img.gz
because I wanted these 5 points:

1) autoplay at startup (on usbkey with lots of music folder
2) GPIO management OK
3) button shutdown (electric)
4) random reading at startup
5) I2C display

my last point (5) is difficult for me, please help me...

Bye

hondagx35

Hi Dom,

it's strange because my SD card is a 16GB... only 2GB for system...

This is normal, you have to expand your file system:

fdisk /dev/mmcblk0

Delete the second partition /dev/mmcblk0p2
d
2

Create a new primary partition and use default sizes prompted. This will then create a partiton that fills the disk
n
p
2
enter
enter

Save and exit fdisk:
w


Now reboot. Once rebooted:
resize2fs /dev/mmcblk0p2

Frank

dom_france

Hi Frank,

OK, My computer's software is LINUXMINT,
I use Gparted, and now, gcc is OK on my raspberry...

and space OK on my SD:

and now ?

I2C-tools ok, but ii2cdetect -y 1 no work....

see you later...

Bye

thank you

dom_france

Hi,

in this forum #1287 I see this :

3) Open /etc/modules-load.d/raspberrypi.conf with:

nano /etc/modules-load.d/raspberrypi.conf

And add this at the end:

i2c-bcm2708
i2c-dev

But I don't have a file name "raspberrypi.conf in /etc/modules-load.d...

?

My Raspberry is a raspberry pi 3 Model B.

A+++

dom_france

Tonight I try this with success, but I'm no sure :

I make a new file in /etc/modules-load.d with this name : i2c.conf

I edited this file with "nano /etc/modules-load.d/i2c.conf" and I put this (and only this) : i2c-dev

I save and quit this file.

Then, i type this : modprobe i2c-dev

and finally, i2cdetect -y 1 ok :

but I'm no sure...

is it normal that I have the past by creating a file in /etc/modules-load.d ?

dom_france

WIth this order "lsmod | grep i2c", I get this :

... Normal ?

OK or NOT OK ?

hondagx35

Hi Dom,

But I don't have a file name "raspberrypi.con in /etc/modules-load.d...

Create it with:

nano /etc/modules-load.d/raspberrypi.conf

It was obvious to me, so sorry I didn't mention this step.

edit:

OK or NOT OK ?

Yes it is OK.

Frank

dom_france

Hi,

I make this :

python3 : OK
Adafruit for LCD : OK => Adafruit LCD char library installed for parallel display.

I try with parallel display, I think It's OK, see my snapshot :

but no ok in I2C...

I have this problem :

Traceback (most recent call last):
  File "start.py", line 9, in <module>
    import i2c_display
  File "/home/root/RuneAudioLCDMod-master/i2c_display.py", line 97, in <module>
    class i2c_display(display.display):
AttributeError: module 'display' has no attribute 'display'

dom_france

Hello,

Someone could help me step by step, please ?

I have the impression that all the examples we can find are about raspberry pi 2, and I want to do it for a raspberry pi 3 model B.

A+

DOM

dom_france

in library "RuneAudioLCDMod-master", I would like to make an adaptation for I2C, can you help me ?

I changed this :

in "RuneAudioLCDMod-master/start.py" at the beginning, I replace 'import parallel_display' to 'import i2c-display' because I would like I2C

But now, if I try to run the program with this command :

python /root/RuneAudioLCDMod-master/start.py

I have this problem :

Traceback (most recent call last):
  File "start.py", line 10, in <module>
    import i2c_display
  File "/home/root/RuneAudioLCDMod-master-OK-I2C/i2c_display.py", line 97, in <module>
    class i2c_display(display.display):
AttributeError: module 'display' has no attribute 'display'

I'm stuck, I do not know what to do?

Could someone send me a link to the version that would work in I2C?

Thank you

Bye

dom_france

One mystake :

in display.py we found :
class Display => with D

or in i2c_display.py, it's "display.display" = d !

....

see my photo in the repository Display with "D" replace "d" to obtain "display" :

dom_france

Ouaaaahhh ! I'm almost there....

But I feel like the first to want to do it ...

I do not understand why there are errors like this...

A+

DOM