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Banana Pi: Temperature Sensor (DS18B20) - Tutorial


Requirements

    --> Banana Pi running Raspbian for Banana Pi
    --> Breadboard
    --> Jumper Wires
    --> DS18b20
    --> 4.7K Ohm resistor
    --> Breakout cobbler

       

      Hardware Setup

      Refer to the graphic for the correct wiring. Make sure the Banana Pi is switched off to prevent any possible damage.

      Banana Pi Temperature Sensor - DS18B20

      Software Setup

      Double check the wiring and boot the device. In order to be able to access the temperature data, we need to make some minor adjustments to the script.bin file, which is a binary configuration file used by Allwinner SOC.
      sudo apt-get install git
git clone https://github.com/linux-sunxi/sunxi-tools
cd sunxi-tools
make

#location of the script.bin file
cd /boot/bananapi/

#get the fex file
sudo /home/bananapi/sunxi-tools/bin2fex script.bin bananapi.fex

#edit the fex file
sudo nano bananapi.fex

#add the following at the end, save (CTRL + O) and close
[w1_para]
gpio = 4

#.fex back to .bin
sudo /home/bananapi/sunxi-tools/fex2bin bananapi.fex script.bin

sudo reboot

      Reading raw data from the sensor

      After successfully rebooting your device, you will notice that /sys/bus/w1/devices is no longer empty. 
      bananapi@lemaker ~ $ cd /sys/bus/w1/devices
bananapi@lemaker /sys/bus/w1/devices $ ls
28-000006203041  w1_bus_master1
bananapi@lemaker /sys/bus/w1/devices $ cd 28-000006203041
bananapi@lemaker /sys/bus/w1/devices/28-000006203041 $ ls
driver  id  name  power  subsystem  uevent  w1_slave
bananapi@lemaker /sys/bus/w1/devices/28-000006203041 $ cat w1_slave
5e 01 4b 46 7f ff 02 10 8d : crc=8d YES
5e 01 4b 46 7f ff 02 10 8d t=21875
      t=21875 is the number we are looking for. E.g.: 21.9 degree Celsius (°C) in my case.

      Banana Pi Temperature Sensor (DS18B20)
      my setup
      Labels:

      Comments

      1. Unknown1 October 2014 at 14:56

        This comment has been removed by the author.

        ReplyDelete
      2. Anonymous15 October 2014 at 06:53

        Hi, nice tutorial! What distribution were you running?

        ReplyDelete
      3. trimi3 February 2015 at 13:15

        Thnx you saved my life. I just got one sensor working with my banana pi after 24h of tring everything.

        ReplyDelete
      4. Unknown14 February 2015 at 05:06

        Hi, i have a bananapro with lubuntu. i made the software update above. The make instruction is ok but there is no root/bananapi directory and no script.bin. What is the reason.?

        ReplyDelete
      5. Anonymous14 February 2015 at 08:53

        Same problem like Josef. Banana Pi running Bananian: /boot/ is empty

        ReplyDelete
        Replies
        1. Mike21 February 2015 at 03:27

          try raspbian

          http://www.lemaker.org/resources/9-38/image_files.html

          Delete
        2. Anonymous30 March 2015 at 12:32

          /boot is not empty, but /boot is not mounted. Try to enter:
          mount /dev/mmcblk0p1 /boot

          Delete
      6. Anonymous22 March 2016 at 00:51

        sunxi-tools does not install jessie 15.08
        install fail

        ReplyDelete
      7. Anonymous22 March 2016 at 00:51

        This comment has been removed by the author.

        ReplyDelete
      8. Unknown11 April 2016 at 13:27

        Hi
        I have problem with compilation.

        root@openmediavault:/sunxi-tools# make
        bash: make: command not found

        Any ideas how to make it?

        ReplyDelete
        Replies
        1. Anonymous20 November 2016 at 23:24

          you need install:
          #apt-get install build-essential

          Delete
      9. Roel13 December 2016 at 11:19

        Hi Mike, thanks for the tutorial!

        I found "script.bin" in "/boot" directly, there was no "/boot/bananapi". (running Raspbian GNU/Linux 7 (wheezy)) I copied the modified version of script.bin to both positions for good measure. (tried only overwriting the old file, without succes)
        After following the instructions, I only found "w1_bus_master1" in "/sys/bus/w1/devices".
        The temperature sensor worked without problem when I had it connected to an Arduino.
        I don't see any error message or other clue.
        Do you have an idea what more I could try?

        Thanks in advance!
        Roel

        ReplyDelete

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