picore and python

[Silver1omo]

I have installed picoreplayer in a RPI B and decided to add GPIO support to activate/deactivate a relay and turn off/on the amp.

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tc@piCorePlayer:~$ uname -a
Linux piCorePlayer 3.14.4-piCore+ #1 PREEMPT Sat May 31 15:15:24 CEST 2014 armv6l GNU/Linux
Faced problems adding extension due to the limited size of the tce partition so I resized it:
/dev/mmcblk0p2          906.6M     57.8M    805.4M   7% /mnt/mmcblk0p2

And then tried to install python using tce-load -wi python.tcz, it downloaded but did not install, so I tried tce-load -i python.tcz

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tc@piCorePlayer:~$ tce-load -i python.tcz
mount: mounting /dev/loop50 on /tmp/tcloop/python failed: Invalid argument
Spent some time searching in google with no luck. Any help will be appreciated.

[lykkedk]

Hey 

Look here, and when fixed, you can try again :

http://forum.tinycorelinux.net/index.php/topic,16439.0.html

Regards... Jesper

[Silver1omo]

Jesper, I read that thread, but don't see what I need to fix.

[lykkedk]

Did you expand mmcblk0p2, reboot and resize.

Its explained in the Readme file

Jesper

[bmarkus]

Where is your /tce directory?

[Silver1omo]

Jesper, I did.
Bela, is in mnt/mmcblk0p2/tce

I just re-installed picoreplayer and resized and expanded mmcblk0p2 then installed compile-essentials, python-dev and python-RPi.GPIO. It is working now.

[lykkedk]

Cool

Let us see, when you have set up youre
Relay, schematic etc...

Would be nice to see

Jesper

[Silver1omo]

This looks like it can work:
http://raspberrypihobbyist.blogspot.com/2012/10/revision-to-relay-circuit.html

[Paul_123]

I just use these

http://www.ebay.com/itm/5V-Four-4-Channel-Relay-Module-With-optocoupler-For-PIC-AVR-DSP-ARM-Arduino-8051-/310574401892?pt=LH_DefaultDomain_0&hash=item484fad4964

Even though these are 5 volts.   Power the module with 5 volts, and the 3.3 volts from the GPIO is plenty enough to activate the relay.

I use a slightly modified version of squeezelite to toggle the relay based on the state of the player.

[lykkedk]

Paul.

Care to share the details..

The determination of player statement, toggle a relay sounds very interesting!

Jesper.

[Silver1omo]

I found a LMS plugin that executes scripts on the LMS server based on player status/events, squeezedvera.
So I "press" the power button on the squeezebox app and squezzedvera executes a shell script in LMS that opens a CGI page (wget) in the RPI, that executes a python script and I have GPIO control!
So now I just need to get and wire the relays.

There should be a lot of cleaner options, but this seems to work nicely, I have only tested with a DMM. Off 0v, On 3.3v.

[Silver1omo]

Got the parts and stuffed them in a project box. It is working 

[lykkedk]

Cool

Congrats..

Regards... Jesper

(Btw: picture perhaps? Tinypic.com

[Silver1omo]

Quick and dirty:

[Silver1omo]

I just use these

http://www.ebay.com/itm/5V-Four-4-Channel-Relay-Module-With-optocoupler-For-PIC-AVR-DSP-ARM-Arduino-8051-/310574401892?pt=LH_DefaultDomain_0&hash=item484fad4964

Even though these are 5 volts.   Power the module with 5 volts, and the 3.3 volts from the GPIO is plenty enough to activate the relay.

I use a slightly modified version of squeezelite to toggle the relay based on the state of the player.

I might try one of those modules. They seem popular.