LCD Driver

[Vitrail]

Hi, 
 
I have an 1wire network at home in order to monitor temperature, humidity, door states, ... 
I use owfs and personal development in php and bash to display information about my home.
 
But I would like to add a small lcd display on my network. I search sample schematic on internet and I always find hobby-boards.com broken link like :
 
h**p://w3.hobby-boards.com/catalog/howto_lcd_driver.php
h**p://w3.hobby-boards.com/catalog/links/lcd2-r1/LCD%20Driver%20v2.0%20Schematic.pdf
 
You don't sell anymore this product, but owfs and ds2408 don't change a lot, so I think this old product can work today ?
 
Can you release the schematic and the doc about this product ?
 
Thanks
 
Pierre-Yves
 

 

[ericvic]

I will see if I can find the schematic but you can easily find some schematics for a DS2408 based LCD driver on the Internet, I think there is even one in the data sheet for the DS2408.
 
Eric

 

[sda]

If Eric can't find anything for you, I have some info I downloaded in 2007 from HB for the v3.0 LCD driver.  I can post them with Eric's permission.

 

[Vitrail]

I try to build my driver from the maxim schematic but i can't display anything with owfs. I have "invalid argument" error, that why I would like to try another driver
 
Thanks both of you if you can help me.

 

[pete_c]

Found a script and a correction for the LCD display here:
 
http://comments.gmane.org/gmane.comp.file-systems.owfs.devel/9429
 
Schematic:
http://datasheets.maximintegrated.com/en/ds/DS2408.pdf

#!/bin/bash

HeureDernierAffichage=0
COMPTEUR_AFFICHAGE=0
MYLCD=/tmp/1wire/29.1C9E09000000
LCD1="$MYLCD/LCD_H/screen"
LCD2="$MYLCD/LCD_H/message"
MESSAGE[1]="Bonjour Pirouette!                      Temp. Cave="
MESSAGE[2]="Bonjour Pirouette!                      Temp. Chaud="
MESSAGE[3]="Bonjour Pirouette!                      Temp. Entree="
MESSAGE[4]="Bonjour Pirouette!                      Temp. Ext="
MESSAGE[5]="Bonjour Pirouette!                      Temp. Server="

function DerouleAffichage   # scroll message 1 to 5
{
let TEMP_PASSE=`date +%s`-$HeureDernierAffichage  # message on LCD will change
every 5 seconds
echo -n "TEMP_PASSE=$TEMP_PASSE    "
if [ $TEMP_PASSE -gt 5 ]; then
  let COMPTEUR_AFFICHAGE=$COMPTEUR_AFFICHAGE+1
  if [ $COMPTEUR_AFFICHAGE -gt 5 ]; then let COMPTEUR_AFFICHAGE=1; fi # after
message 5 loop to message 1
  let HeureDernierAffichage=`date +%s`  
  printf "%s" "${MESSAGE[$COMPTEUR_AFFICHAGE]}$COMPTEUR_AFFICHAGE" > $LCD2
  echo 0 > $MYLCD/PIO.BYTE
fi
}

function TestAppuiBouton
{
  let REGISTRE=`cat $MYLCD/sensed.BYTE | sed -e "s/ //g"`
  let "REGISTRE &= 7"  # Mask with AND keep 3 first bits
}

   # Initialise the display
  printf "\x0C" > $LCD1
  printf "1" > $MYLCD/LCD_H/clear
  printf "1" > $MYLCD/LCD_H/home

while [ 1 ]
do
  DerouleAffichage
  echo "COMPTEUR_AFFICHAGE=$COMPTEUR_AFFICHAGE   REGISTRE=$REGISTRE"
  sleep 0.5
  TestAppuiBouton
done
 

before writing to the LCD do
printf "1" > "/mnt/owfs/29.BABC08000000/strobe"
and
If you want to fiddle with 3 IO
printf "0" > "/mnt/owfs/29.BABC08000000/strobe"

 

[Vitrail]

I try to rewire my LCD with the maxim's datasheet schematic, and I have the same problem
 

root@ubuntu:/mnt/1wire/29.20040C000000# printf "1" > /mnt/1wire/29.20040C000000/strobe
root@ubuntu:/mnt/1wire/29.20040C000000# printf "\x0C" > /mnt/1wire/29.20040C000000/LCD_H/screen
-su: printf: erreur d'écriture : Argument invalide

root@ubuntu:/mnt/1wire/29.20040C000000# printf "1" > /mnt/1wire/29.20040C000000/LCD_H/clear 
-su: printf: erreur d'écriture : Argument invalide

I try 2 different 2408, The PIO after  printf "\x0C" is  0,0,0,1,0,0,1,1

 

[Vitrail]

Thanks,
 
It's good, Luc from the owfs mailing list send me the schema, my LCD works but only with OWFS 2.8p15 from the ubuntu package.
 
Previously I test on owfs 2.9p1
 
I will test intermediate version from the source code 

 

[pete_c]

Good news Vitrail.  I have yet to try connecting an LCD device to my 1-wire network.
 
While I have some 5-6 1-wire networks I have only one connected to an Arm based CPU base build device.  It was more of a test to see how a Midon Temp05 would function.  That said I also use the arm based device to put the xAP values from the 1-wire device on the network.