Hello everyone.
+Description:
+I wrote a script that connects to HDMI CEC ( cec-client needed ) and
+listens for TV Remote key presses. Based on the keys pressed / released
+(or auto-released; holding down certain keys for too long makes them
+auto-release) different actions are executed. Some examples:
-
+
- write letters and numbers using 0-9 keys (simulating 3x4 keypad +phones - key "2" switches between a-b-c-2, key 9 switches between +w-x-y-z-9) ( xdotool needed ) +
- move mouse cursor using up/down/left/right (the longer you hold the +key down, the faster it goes) and click (enter = left click; channels +list = right click) ( xdotool needed ) +
- opening web sites in chomium (red key for YouTube, green for Google, blue for incognito window) +
If you want to use firefox instead of chromium, replace "chromium" with "firefox" in the script below.
+Alternatively, you can just install chromium:
sudo apt-get install chromium-browser
+See all the available keys below:
+ +
These are the keys supported by my TV Remote. You can modify the script for your TV Remote, see Modification below.
+Installation:
+First you need to install cec-client and xdotool; using terminal:
sudo apt-get install cec-client xdotool
+Test if you can receive TV Remote button presses with cec-client; using terminal:
+cec-client
+You should see some diagnostic messages. Press numeric keys (as they +are most likely to be supported) on your TV Remote. Watch out for new +lines, especially of this form:
+something something **key pressed: 8** something something
+If you see this kind of messages, then this should work for you.
+If not, make sure you've got CEC enabled on your TV (see this WIKI 99 for more info).
+For my TV, pressing the Source button a couple of times helped (so it
+kind-of flips trough all the sources and circles back to the Raspberry
+Pi, detects CEC and connects to it).
So, on to the script / installation:
+Create the file cecremote.sh and mark it as executable; using terminal:
touch cecremote.sh
+chmod +x cecremote.sh
+Then open it; using terminal:
+nano cecremote.sh
+Copy - paste this in the file:
+#!/bin/bash
+function keychar {
+ parin1=$1 #first param; abc1
+ parin2=$2 #second param; 0=a, 1=b, 2=c, 3=1, 4=a, ...
+ parin2=$((parin2)) #convert to numeric
+ parin1len=${#parin1} #length of parin1
+ parin2pos=$((parin2 % parin1len)) #position mod
+ char=${parin1:parin2pos:1} #char key to simulate
+ if [ "$parin2" -gt 0 ]; then #if same key pressed multiple times, delete previous char; write a, delete a write b, delete b write c, ...
+ xdotool key "BackSpace"
+ fi
+ #special cases for xdotool ( X Keysyms )
+ if [ "$char" = " " ]; then char="space"; fi
+ if [ "$char" = "." ]; then char="period"; fi
+ if [ "$char" = "-" ]; then char="minus"; fi
+ xdotool key $char
+}
+datlastkey=$(date +%s%N)
+strlastkey=""
+intkeychar=0
+intmsbetweenkeys=2000 #two presses of a key sooner that this makes it delete previous key and write the next one (a->b->c->1->a->...)
+intmousestartspeed=10 #mouse starts moving at this speed (pixels per key press)
+intmouseacc=10 #added to the mouse speed for each key press (while holding down key, more key presses are sent from the remote)
+intmousespeed=10
+
+while read oneline
+do
+ keyline=$(echo $oneline | grep " key ")
+ #echo $keyline --- debugAllLines
+ if [ -n "$keyline" ]; then
+ datnow=$(date +%s%N)
+ datdiff=$((($datnow - $datlastkey) / 1000000)) #bla bla key pressed: previous channel (123)
+ strkey=$(grep -oP '(?<=sed: ).*?(?= \()' <<< "$keyline") #bla bla key pres-->sed: >>previous channel<< (<--123)
+ strstat=$(grep -oP '(?<=key ).*?(?=:)' <<< "$keyline") #bla bla -->key >>pressed<<:<-- previous channel (123)
+ strpressed=$(echo $strstat | grep "pressed")
+ strreleased=$(echo $strstat | grep "released")
+ if [ -n "$strpressed" ]; then
+ #echo $keyline --- debug
+ if [ "$strkey" = "$strlastkey" ] && [ "$datdiff" -lt "$intmsbetweenkeys" ]; then
+ intkeychar=$((intkeychar + 1)) #same key pressed for a different char
+ else
+ intkeychar=0 #different key / too far apart
+ fi
+ datlastkey=$datnow
+ strlastkey=$strkey
+ case "$strkey" in
+ "1")
+ xdotool key "BackSpace"
+ ;;
+ "2")
+ keychar "abc2" intkeychar
+ ;;
+ "3")
+ keychar "def3" intkeychar
+ ;;
+ "4")
+ keychar "ghi4" intkeychar
+ ;;
+ "5")
+ keychar "jkl5" intkeychar
+ ;;
+ "6")
+ keychar "mno6" intkeychar
+ ;;
+ "7")
+ keychar "pqrs7" intkeychar
+ ;;
+ "8")
+ keychar "tuv8" intkeychar
+ ;;
+ "9")
+ keychar "wxyz9" intkeychar
+ ;;
+ "0")
+ keychar " 0.-" intkeychar
+ ;;
+ "previous channel")
+ xdotool key "Return" #Enter
+ ;;
+ "channel up")
+ xdotool click 4 #mouse scroll up
+ ;;
+ "channel down")
+ xdotool click 5 #mouse scroll down
+ ;;
+ "channels list")
+ xdotool click 3 #right mouse button click"
+ ;;
+ "up")
+ intpixels=$((-1 * intmousespeed))
+ xdotool mousemove_relative -- 0 $intpixels #move mouse up
+ intmousespeed=$((intmousespeed + intmouseacc)) #speed up
+ ;;
+ "down")
+ intpixels=$(( 1 * intmousespeed))
+ xdotool mousemove_relative -- 0 $intpixels #move mouse down
+ intmousespeed=$((intmousespeed + intmouseacc)) #speed up
+ ;;
+ "left")
+ intpixels=$((-1 * intmousespeed))
+ xdotool mousemove_relative -- $intpixels 0 #move mouse left
+ intmousespeed=$((intmousespeed + intmouseacc)) #speed up
+ ;;
+ "right")
+ intpixels=$(( 1 * intmousespeed))
+ xdotool mousemove_relative -- $intpixels 0 #move mouse right
+ intmousespeed=$((intmousespeed + intmouseacc)) #speed up
+ ;;
+ "select")
+ xdotool click 1 #left mouse button click
+ ;;
+ "return")
+ xdotool key "Alt_L+Left" #WWW-Back
+ ;;
+ "exit")
+ echo Key Pressed: EXIT
+ ;;
+ "F2")
+ chromium-browser "https://www.youtube.com" &
+ ;;
+ "F3")
+ chromium-browser "https://www.google.com" &
+ ;;
+ "F4")
+ echo Key Pressed: YELLOW C
+ ;;
+ "F1")
+ chromium-browser --incognito "https://www.google.com" &
+ ;;
+ "rewind")
+ echo Key Pressed: REWIND
+ ;;
+ "pause")
+ echo Key Pressed: PAUSE
+ ;;
+ "Fast forward")
+ echo Key Pressed: FAST FORWARD
+ ;;
+ "play")
+ echo Key Pressed: PLAY
+ ;;
+ "stop")
+ ## with my remote I only got "STOP" as key released (auto-released), not as key pressed; see below
+ echo Key Pressed: STOP
+ ;;
+ *)
+ echo Unrecognized Key Pressed: $strkey ; CEC Line: $keyline
+ ;;
+
+ esac
+ fi
+ if [ -n "$strreleased" ]; then
+ #echo $keyline --- debug
+ case "$strkey" in
+ "stop")
+ echo Key Released: STOP
+ ;;
+ "up")
+ intmousespeed=$intmousestartspeed #reset mouse speed
+ ;;
+ "down")
+ intmousespeed=$intmousestartspeed #reset mouse speed
+ ;;
+ "left")
+ intmousespeed=$intmousestartspeed #reset mouse speed
+ ;;
+ "right")
+ intmousespeed=$intmousestartspeed #reset mouse speed
+ ;;
+ esac
+ fi
+ fi
+done
+Finally, save it; using nano in terminal:
+press "Ctrl+X" to close the file, then "Y" to confirm saving, then "Enter" to save the file under the right file name
Try executing it, using terminal:
+cec-client | ./cecremote.sh
+At this point it should be working.
+Point the TV Remote at the TV, press up/down/left/right and check if the mouse pointer is moving.
+Press 9 44 2 8 7777 0 88 7 and it should write "whats up".
The script doesn't output anything, except when it encounters a
+button press that it doesn't recognize, or it doesn't have a function
+set up for that button yet (play button being one of them).
+If you want it to output all the messages it receives, find the line and uncomment it by deleting the # : #echo $keyline --- debugAllLines
So, if everything works, exit the script in terminal: Press Ctrl+C
+Run at startup:
+If you want to start this script every time the Raspberry starts, create
+ a new file called cecremotestart.sh and mark it as executable; using
+terminal:
touch cecremotestart.sh
+chmod +x cecremotestart.sh
+Then open it; using terminal:
+nano cecremotestart.sh
+Copy - paste this in the file:
+#!/bin/bash
+cec-client | /home/raspberry/cecremote.sh #<-- change this according to your username / path to the script
+Finally, save it; using nano in terminal:
+press "Ctrl+X" to close the file, then "Y" to confirm saving, then "Enter" to save the file under the right file name
Then add this in the Startup Programs (Menu - System - Control Center + - Startup Programs; Add; Give it a name, and enter the path (or press +Browse) of the script in the filesystem).
+Restart, try, report 
Modification:
+If you want, you can edit the script to change or add the commands executed on certain button presses.
+You can detect the additional buttons that CEC on your TV supports. Kill
+ the running cec-client, run the cec-client in the terminal, and watch
+for the output while you're pressing all the keys on your TV Remote;
+using terminal:
killall cec-client
+cec-client
+Ctrl+C when you're ready to stop
+Edit the script, then execute the modified script by manually executing cecremotestart.sh; using terminal:
+./cecremotescript.sh
+Ctrl+C to stop
+When you're satisfied, just restart your Raspberry PI.
+That's it from me - a simple and crude way to control your Raspberry +PI with the TV Remote, for when you don't have the keyboard/mouse +connected and VNC-ing is too much of a bother.
+Try it and report
created
Mar '16last reply
Apr '18- 3
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