DS18B20

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DS18B20

Created Воскресенье 20 октября 2019
Считывание температуры с помощью датчика DS18B20 и Orange Pi PC (ARMBIAN 5.35)
Подключение датчика температуры DS18B20 к Orange Pi, Banana Pi, Raspberry Pi

1-Wire
http://linux-sunxi.org/1-Wire
Linux kernel 4.14
You don't have to edit the fex-file, but the /boot/armbianEnv.txt and add the lines:

 overlays=w1-gpio
 param_w1_pin=PI3                # OPi pin7 gpio269 PWM1
 param_w1_pin_int_pullup=1     # internal pullup-resistor: 1=on, 0=off

Connect the data pin of devices to gpio pin PI3 and proceed like Kernel 3.4 with
nano /etc/modules
w1-sunxi
w1-gpio
w1-therm
modprobe w1-gpio w1-therm
ls -la /sys/bus/w1/devices/
total 0
drwxr-xr-x 2 root root 0 Feb 7 12:02 .
drwxr-xr-x 4 root root 0 Feb 7 11:52 ..
lrwxrwxrwx 1 root root 0 Feb 7 12:01 28-0316819dedff -> ../../../devices/w1_bus_master1/28-0316819dedff
lrwxrwxrwx 1 root root 0 Feb 7 11:52 w1_bus_master1 -> ../../../devices/w1_bus_master1

cat /sys/bus/w1/devices/28-0316819dedff/w1_slave
45 01 4b 46 7f ff 0b 10 84 : crc=84 YES
45 01 4b 46 7f ff 0b 10 84 t=20312
Read Data Sensor
simple bash script for read 1-wire temp sensor

 #!/bin/bash 
 file="/sys/bus/w1/devices/28-0316819dedff/w1_slave"
 function find(){
  [[ "$1" =~ "$2" ]] && true || false
 } 
 while :
 do
     DATE=$(date +"%d-%m-%Y-%H:%M:%S")
     #read device
     CRC=false
     while read curline; do
         #check crc
         if( find "$curline" "crc" && find "$curline" "YES" ) then
             CRC=true
             DEVICE=`echo $curline|cut -d':' -f 1`   
         fi
         if($CRC && find "$curline" "t=") then
         TEMP=`echo $curline|cut -d'=' -f 2`
         echo $DEVICE ";" $DATE ";" `echo "scale=3;$TEMP/1000"|bc -l` 
         fi
     done <$file
 sleep 10
 done

28-0316819dedff
28-0516826434ff
28-0516823175ff
28-031681aa62ff
28-031681bb49ff

rpimonitor config

dynamic.1.name=living_room_temp
dynamic.1.source=/sys/devices/w1_bus_master1/28-031681bb49ff/w1_slave
dynamic.1.regexp=t.(\d+)
dynamic.1.postprocess=sprintf("%.2f", $1/1000)
dynamic.1.rrd=GAUGE

Содержание