aurelius

This is a RaspberryPi project with a talking parrot

1. RaspberryPi setup
2. i2c
3. gpio
4. raspicam
5. graphicsmagick
6. Node modules

RaspberryPi setup

Aurelius uses several libraries like i2c, gpio, raspicam and graphicsmagick. Follow these steps to set up your pi.

i2c

First you need to install i2c-tools on your raspberry:

sudo apt-get install i2c-tools

Run sudo raspi-config and change the i2c settings like:

1. Click on 9 Advanced Options
2. Choose A7 I2C
3. Enable I2C ARM Interface
4. Load the I2C kernel by default
5. Reboot your Raspberry

After reboot go to the terminal and type

sudo nano /etc/modules

..and add these lines:

i2c-bcm2708
i2c-dev

Save with ctrl+O and exit with ctrl+X

Depending on your distribution, you have to edit the following file: (not necessary if this file doesn't exist)

sudo nano /etc/modprobe.d/raspi-blacklist.conf

Find these two lines and comment them out with '#', just like this:

#blacklist spi-bcm2708
#blacklist i2c-bcm2708

Restart your Raspberry again.

Attach your I2C module to the raspberry and try:

i2cdetect -y 1

The output should look something like this: (0x68 active)

0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

If you get no output, although your sensor is propery attached, try this:

sudo chgrp i2c /dev/i2c-1
sudo chmod 666 /dev/i2c-1

Restart your Raspberry and try again, it should work now

gpio

Before gpio works install gpio-admin tools from quick2wire. Currently the package has a bug, but it can easily be fixed. First clone the quic2wire repro

git clone git://github.com/quick2wire/quick2wire-gpio-admin.git
cd quick2wire-gpio-admin

On currrent RaspberryPi you need to change the i2c path that is stated in /src/gpio-admin.c

sudo nano src/gpio-admin.c

Change the path in line 30 from sys/devices/virtual/gpio/gpio%u/%s to /sys/class/gpio/gpio%u/%s. After that, still in quick2wire directory type:

make
sudo make install
sudo adduser $USER gpio

raspicam

Connect the camera to the Raspberry. After that type:

sudo raspi-config

In the config menu select:

1. Enable camera
2. Finish Reboot the Raspberry and you're good to go

(optional) Eventually you're running in some problems with permissions, here's a little workaround:

sudo chmod 777 /dev/vchiq

graphicsmagick

Needed for image comparison

sudo apt-get install graphicsmagick

Node modules

Load these node modules in your working directory to make the code working

npm install i2c-bus i2c-mpu6050 pi-gpio raspicam gm