code and solution: May 2014

Raspberry Pi Remote control:

Last of this tutorial you can control any remote control device with your voice.

I will try to describe every step to complete this tutorial.

Hardware:

1. Raspberry Pi
2. IR receiver
3. IR transmitter
4. WiFi module (optional)

Connection:

IR Receiver :

Data --------------------------> GPIO18(PIN 12)
VCC   --------------------------> 3V (PIN1)
GND --------------------------> Ground(PIN6)

IR Transmitter

Data --------------------------> GPIO17(PIN 11)
VCC   --------------------------> 5V (PIN2)
GND --------------------------> Ground(PIN14)

IR receiver and transmitter can buy from ebay and it's look like:

it's cheap, cost : C $3.29

Software:

1. You need Raspbian.
2. For IR device:

First, we’ll need to install and configure LIRC to run on the RaspberryPi:

sudo apt-get install lirc

Add this to your /etc/modules file:

lirc_dev
lirc_rpi gpio_in_pin=23 gpio_out_pin=22

Change your /etc/lirc/hardware.conf file to:

########################################################
# /etc/lirc/hardware.conf
#
# Arguments which will be used when launching lircd
LIRCD_ARGS="--uinput"

# Don't start lircmd even if there seems to be a good config file
# START_LIRCMD=false

# Don't start irexec, even if a good config file seems to exist.
# START_IREXEC=false

# Try to load appropriate kernel modules
LOAD_MODULES=true

# Run "lircd --driver=help" for a list of supported drivers.
DRIVER="default"
# usually /dev/lirc0 is the correct setting for systems using udev
DEVICE="/dev/lirc0"
MODULES="lirc_rpi"

# Default configuration files for your hardware if any
LIRCD_CONF=""
LIRCMD_CONF=""
########################################################

Now restart lircd so it picks up these changes:

sudo /etc/init.d/lirc stop
sudo /etc/init.d/lirc start

Testing the IR receiver

Testing the IR receiver is relatively straightforward.

Run these two commands to stop lircd and start outputting raw data from the IR receiver:

sudo /etc/init.d/lirc stop
mode2 -d /dev/lirc0

Point a remote control at your IR receiver and press some buttons. You should see something like this:

space 16300
pulse 95
space 28794
pulse 80
space 19395
pulse 83
space 402351
pulse 135
space 7085
pulse 85
space 2903

If you don’t, something is probably incorrectly configured. Triple check that you’ve connected everything properly and haven’t crossed any wires. I highly recommend referring to the schematics I linked to above. There is also some trouble shooting advice in the RaspberryPi Forum thread I linked to above. Finally - you may want to do this in a dark room. I found that my desk lamp and overhead light would cause the IR receiver to think it was receiving valid signals.

Wiring up the IR transceiver

The /etc/lirc/lircd.conf file tells LIRC about your remote control. Since every remote control is different, you need to generate a different config for each remote. Alternatively you could try and find your remote control config file here: http://lirc.sourceforge.net/remotes/.

To generate your own configuration run:

$ sudo irrecord -f -d /dev/lirc0 /etc/lirc/lircd.conf

and carefully follow the on-screen instructions. At some point it will ask you to enter the commands for each button you press. You can list the available commands (in another terminal) with:

$ irrecord --list-namespace

After you have finished, restart the lirc daemon (or reboot) and test your remote by running:

$ irw

Your commands should appear in the console.

Testing the IR LED

You’re going to need to either find an existing LIRC config file for your remote control or use your IR receiver to generate a new LIRC config file. In my case I created a new LIRC config file. To do this, read the documentation on the irrecord application that comes with LIRC.

When using irrecord it will ask you to name the buttons you’re programming as you program them. Be sure to run irrecord --list-namespace to see the valid names before you begin.

Here were the commands that I ran to generate a remote configuration file:

# Stop lirc to free up /dev/lirc0
sudo /etc/init.d/lirc stop

# Create a new remote control configuration file (using /dev/lirc0) and save the output to ~/lircd.conf
irrecord -d /dev/lirc0 ~/lircd.conf

# Make a backup of the original lircd.conf file
sudo mv /etc/lirc/lircd.conf /etc/lirc/lircd_original.conf

# Copy over your new configuration file
sudo cp ~/lircd.conf /etc/lirc/lircd.conf

# Start up lirc again
sudo /etc/init.d/lirc start

Once you’ve completed a remote configuration file and saved/added it to /etc/lirc/lircd.confyou can try testing the IR LED. We’ll be using the irsend application that comes with LIRC to facilitate sending commands. You’ll definitely want to check out the documentation to learn more about the options irsend has.

Here are the commands I ran to test my IR LED (using the “yamaha” remote configuration file I created): yamaha or /home/pi/lircd.conf

# List all of the commands that LIRC knows for 'yamaha'
irsend LIST yamaha ""

# Send the KEY_POWER command once
irsend SEND_ONCE yamaha KEY_POWER

# Send the KEY_VOLUMEDOWN command once
irsend SEND_ONCE yamaha KEY_VOLUMEDOWN

I tested that this was working by pointing the IR led at my Yamaha receiver and testing whether I could turn it on and adjust the volume.

DIRECTIVE can be:




SEND_ONCE         - send CODE [CODE ...] once
SEND_START        - start repeating CODE
SEND_STOP         - stop repeating CODE
LIST              - list configured remote items
SET_TRANSMITTERS  - set transmitters NUM [NUM ...]
SIMULATE          - simulate IR event

Success!

That’s it! You’ve now successfully installed and configured LIRC on your RaspberryPi. You can add additional remote control configuration files to your /etc/lirc/lircd.conf file to control multiple remotes.

Setup voice command:

code and solution

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Testing the IR receiver

Wiring up the IR transceiver

Testing the IR LED

Success!

openelec config