Blog 18

Settings Menu

Hardware I used on my Raspberry Pi:

• RPi_UI board | (User Interface)

Programmed in:

• bash

In this post I will show the menu I made, where you can change the: Backlight, Contrast and Volume.

The overall script is based on the scroll menu from blog 13. The menu you can scroll through with button 5(up) and 6(down). On the screen than will be visible which 2 menu you can go to. With button 1 and 2 you can choose which of the 2 you want to edit.

#!/bin/bash

bw_tool -I -D /dev/i2c-1 -a 94 -W 10:00

while true; do
BUTTON=`bw_tool -I -D /dev/i2c-1 -a 94 -R 30:b`

array=(   Volume Contrast Backlight )
# Element 0      1        2 

Narray=(  VOLUME CONTRAST BACKLIGHT )
# Element 0      1        2

  if [ $BUTTON  != "00" ]; then
     bw_tool -I -D /dev/i2c-1 -a 94 -W 10:00
  fi

  if [ $BUTTON  = "20" ]; then
     ./${array[$Number]}
  fi

  if [ $BUTTON  = "10" ]; then
    ./${array[$Numb2]}
  fi

  if [ $BUTTON  = "08" ]; then
     Number=0
  fi

  if [ $BUTTON  = "04" ]; then
     exit
  fi

  if [ $BUTTON  = "02" ]; then
     Number=$(((Number + 2) % 3 ))
  fi

  if [ $BUTTON  = "01" ]; then
     Number=$(((Number + 1) % 3 ))
  fi

Numb2=$((Number + 1))
Numb3=$((Numb2 + 1))

bw_tool -I -D /dev/i2c-1 -a 94 -W 11:00
bw_tool -I -D /dev/i2c-1 -a 94 -t "$Numb2""."${Narray[$Number]}
bw_tool -I -D /dev/i2c-1 -a 94 -W 11:20
bw_tool -I -D /dev/i2c-1 -a 94 -t "$Numb3""."${Narray[$Numb2]} 

sleep 1

done

Backlight/Contrast

This is the script for changing the backlight. The script for changing the contrast is actually the same. The only difference is that instead of writing to protocol 13 you write to protocol 12. So

 bw_tool -I -D /dev/i2c-1 -a 94 -W 13:${array[$Number]}

Has to become

  bw_tool -I -D /dev/i2c-1 -a 94 -W 12:${array[$Number]}

#!/bin/bash
 
bw_tool -I -D /dev/i2c-1 -a 94 -W 10:00

while true; do
BUTTON=`bw_tool -I -D /dev/i2c-1 -a 94 -R 30:b`

array=(   00 19 33 4c 66 7F 99 B2 CC E5 FF )
# Element 0  1  2  3  4  5  6  7  8  9  10

Narray=(   00 10 20 30 40 50 60 70 80 90 100 )
# Name     0  1  2  3  4  5  6  7  8  9  10 

 if [ $BUTTON  != "00" ]; then
    bw_tool -I -D /dev/i2c-1 -a 94 -W 10:00
 fi

 if [ $BUTTON  = "04" ]; then
    exit
 fi

 if [ $BUTTON  = "02" ]; then
    Number=$(((Number + 10) % 11 )) # can be changed to 11 if you want it to get 1 down
 fi

 if [ $BUTTON  = "01" ]; then
    Number=$(((Number + 1) % 11 )) #can be changed to 1 if you want to get it up by 1 
 fi

bw_tool -I -D /dev/i2c-1 -a 94 -W 11:00
bw_tool -I -D /dev/i2c-1 -a 94 -t "$Numb2"${Narray[$Number]}
bw_tool -I -D /dev/i2c-1 -a 94 -W 13:${array[$Number]}

sleep 1
done

array=(   00 19 33 4c 66 7F 99 B2 CC E5 FF )
# Element 0  1  2  3  4  5  6  7  8  9  10
 
Narray=(   00 10 20 30 40 50 60 70 80 90 100 )
# Name     0  1  2  3  4  5  6  7  8  9  10 

The Array counts in hexadecimals. I want to get 10 steps so people who use it could see it would got from zero to 100. FF is in decimals 255. I just used an easy trick to get one of a tenth of 255. What is 25.5. What is around 19 in hexadecimals. After that I kept counting 19 up the hexadecimal number, until I reach FF. Now it got better steps between the parts.

Volume

The script makes it possible to make the audio 5/10 decibel louder or quieter.

$DISPL -t `amixer | grep Mono: | sed -e 's/%] .*//' -e 's/.* \[//'`

To program will at the end read a which % the audio is of it's maximum. With the grep and sed -e files it only search for the wanted text the full text normally would be without sed -e:

 Mono: Playback -600 [91%] [-6.00dB] [on]

After the # I put and audio files, this is optional but there you could put a short audio file. So, that you can directly hear how the loud the audio is.

#!/bin/bash

DISPL="bw_tool -I -D /dev/i2c-1 -a 94"

while true; do
BUTTON=`bw_tool -I -D /dev/i2c-1 -a 94 -R 30:b`

  if [ $BUTTON  != "00" ]; then
     bw_tool -I -D /dev/i2c-1 -a 94 -W 10:00
  fi

  if [ $BUTTON  = "20" ]; then
  amixer -c 0 set PCM 5dB-
  #mplayer ru.mp3
  fi

  if [ $BUTTON  = "10" ]; then
  amixer -c 0 set PCM 5dB+
  #mplayer ru.mp3
  fi
 
  if [ $BUTTON  = "04" ]; then
  exit
  fi

  if [ $BUTTON  = "02" ]; then
  amixer -c 0 set PCM 10dB-
  #mplayer ru.mp3
  fi 

  if [ $BUTTON  = "01" ]; then
  amixer -c 0 set PCM 10dB+
  #mplayer ru.mp3
  fi

$DISPL -W 11:00:b
$DISPL -t `amixer | grep Mono: | sed -e 's/%] .*//' -e 's/.* \[//'`

sleep 1
done

Useful links

User Interface