Blog 05

!BETA!

Now the temperature sensor: For making the temperature sensor we have to make 2 script.

Script 1(The name I gave it was: ui):

#!/bin/sh
ui="bw_tool -a 94 -I -D /dev/i2c-1"
$ui -W 70:c7 # internal tempsens with internal 1.1V as reference
$ui -W 71:c6 # external tempsens with internal 1.1V as reference
$ui -W 81:1000
$ui -W 82:6
$ui -W 80:2

After this we make ui executable:

chmod +x ui 

And look if it worked:

ls -l ui 

This result should have -rwxr-xr-x like me: -rwxr-xr-x 1 root root 216 Sep 7 15:46 ui

Ater you see it works activate it:

./ui 

( There will be nothing visible on screen when you activate it )

chmod +x showtemp 
ls -l showtemp 

-rwxr-xr-x 1 pi pi 999 Sep 7 14:26 showtemp

apt-get install bc 

sh -x ./ui 
+ ui=bw_tool -a 94 -I -D /dev/i2c-1 
+ bw_tool -a 94 -I -D /dev/i2c-1 -W 70:c7:b 
+ bw_tool -a 94 -I -D /dev/i2c-1 -W 71:c6:b 
+ bw_tool -a 94 -I -D /dev/i2c-1 -W 81:1000:s 
+ bw_tool -a 94 -I -D /dev/i2c-1 -W 82:6:b 
+ bw_tool -a 94 -I -D /dev/i2c-1 -W 80:2:b 

sh -x ./showtemp 
+ adcmaxval=65520 
+ vperdeg=0.010 
+ refvoltage=1.1000 
+ offset=50 
+ register_to_read=69 
+ + bc 
echo scale = 10 
+ echo obase=16 
+ echo 1.1000 / 0.010 / 65520 
+ convfactor=.006E06E01 
+ echo obase=16 
+ echo+  scale=3 
bc+ echo 50  
+ offsethex=32 
+ sudo bw_tool+  -I -Dtr a-z A-Z 
 /dev/i2c-1 -a 94 -R 69:s 
+ rawtemp=ACC3 
+ echo ibase=16 
+ echo scale=3 
+ echo ACC3 * .006E06E01 - 32 
+ bc 
24.251648852 

bw_tool -I -D /dev/i2c-1 -a 94 -R 81:s 
0040 

To edit the info

nano ui 

Which has to change in to:

#!/bin/sh 
 ui="bw_tool -a 94 -I -D /dev/i2c-1" 
 $ui -W 70:c7:b # internal tempsens with internal 1.1V as reference 
 $ui -W 71:c6:b # external tempsens with internal 1.1V as reference 
 $ui -W 81:1000:s 
 $ui -W 82:6:b 
 $ui -W 80:2:b 

bw_tool -I -D /dev/i2c-1 -a 94 -R 81:s 
1000 

bw_tool -I -D /dev/i2c-1 -a 94 -t "temp: "`./showtemp`

The remove the latest one and see the newest you are doing it again

bw_tool -I -D /dev/i2c-1 -a 94 -w 10:00 
bw_tool -I -D /dev/i2c-1 -a 94 -t "temp: "`./showtemp

Code that I used: http://www.bitwizard.nl/wiki/index.php/Temperature_sensor_example

( ui voor showtemp om werkende te krijgen time to wait )

bw_tool -I -D /dev/i2c-1 -a 94 -t "temp: "`./showtemp`

Now we have this. It may be better that we also get it to refresh around a several second instead we have to type the code:

bw_tool -I -D /dev/i2c-1 -a 94 -w 10:00 
bw_tool -I -D /dev/i2c-1 -a 94 -t "temp: "`./showtemp

over and over again. So I am going to try to mix the previous code with temperature code so it will check the code every amount of time. ( I will take 5 sec )

nano friet add this text:

( folder with a random name I called it friet. )

#!/bin/bash 
 while true;do 
        bw_tool -I -D /dev/i2c-1 -a 94 -w 10:00 
        bw_tool -I -D /dev/i2c-1 -a 94 -t "temp: "`./showtemp` 
        sleep 5 
done 

do like the other times: chmod +x friet

On Blog 06 I combined made it possible to show the time and temperature on the display.