Blog 10

Push menu

Hello, this time I am finally going to put together what I wanted. I am going to use previous scripts:

• 1. Temperature (From blog 05)
• 2. Time with load averages (From blog 04)
• 3. CPU + GPU (From blog 08)
• 4. Temperature at weather station (From blog 09)
• 5. Wind a weather station (From blog 09)
• 6. Defining Temperature ( not visible on display! ) (From blog 05)

And put them all together in a push button menu. So that I can show the information from the script on the display and use the pushbuttons to control it.

I still had to modify the scripts. But I didn't want to change them so I made a copy from some: Example:

cp timer > time_load 

I made the scripts more basics, so that they only print the information on screen. ( If I wouldn't do this it will make the screen refresh too much or ignore me pushing the button ) So the things I had to remove from the scripts were:

• while true; do
• done
• echo
• 10:00
• 11:00
• sleep

Note! You shouldn't delete 11:20, because the script from pushmenu isn't made to also remove the second line. It only cleans first row with 11:00.

Example from how the 'Time with load averages'(./time_load) has to look like after removing everything that is not needed:

#!/bin/bash

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

       load=`cut -d' ' -f-3 /proc/loadavg`
       $DISPL -t `date +%H:%M:%S`
       $DISPL -W 11:20:b
       $DISPL -t $load

Now the script itself:

#!/bin/bash 

#Print=showtemp2
#Print=time_load
#Print=DIAMoscow2
#Print=cgpu2
#Print=DIAMWind
Print=ui
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`
  
  if [ $Button  != "00" ]; then 
    bw_tool -I -D /dev/i2c-1 -a 94 -w 10:00
  fi

  if [ $Button  = "20" ]; then 
    Print=showtemp2
  fi  

  if [ $Button  = "10" ]; then 
    Print=time_load
  fi 

  if [ $Button  = "08" ]; then 
    Print=cgpu2
  fi

  if [ $Button  = "04" ]; then 
    Print=DIAMoscow
  fi

  if [ $Button  = "02" ]; then 
    Print=DIAMWind
  fi

  if [ $Button  = "01" ]; then 
    Print=ui
  fi

  bw_tool -I -D /dev/i2c-1 -a 94 -w 11:00
  ./$Print

  sleep 1
done

All the 6 buttons reference to the 6 scripts:

• 1. Temperature
• 2. Time
• 3. CPU + GPU
• 4. Temperature at weather station
• 5. Wind at weather station
• 6. ui

Print=ui
bw_tool -I -D /dev/i2c-1 -a 94 -w 10:00 

The first list with #'s can be deleted, but I made it so that I can change it to my preferences. If you remove Print=ui, the display will start with an empty screen. (What isn't a problem, but you will get error messages on the terminal.) The 10:00 will at the start-up it remove everything from display.

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

First it will look if there is a button pressed. If there is no button pressed it will be 00, and then it will be just refresh the last one. When a button is pressed 10 will directly remove the previous text. Because at the beginning of the code it will check: If 30:b doesn't check a number that isn't(with !=) 00 it will refresh the display. So everything will be removed when the button is pressed.

  if [ $Button  = "20" ]; then 
    Print=showtemp2
  fi  

Then it checks with 6 times if there is a button pressed with the number given in the if statements. When then for example someone presses button 1 -> 20. Then it says Print=Showtemp2.

( to detect which button gives which number:

bw_tool -I -D /dev/i2c-1 -a 94 -R 30:b
01

)

bw_tool -I -D /dev/i2c-1 -a 94 -w 11:00
./$Print 

It says it has to place on the line 11:00. ( If you remove that part, it paste the text with the previous one, while refreshing.) With ./$print he then finally prints every second the information from the button pressed that was last pressed. So it would then print out the information from showtemp2.

sleep 1

Thanks to the sleep you now have to wait a second for the refresh of the screen but also for the code to scan which button has been pressed.

I hope this can also be useful for your own use!