onewireMonitor. For Raspberry Pi. This will Monitor onewire temp directory and hard reset power to the DS18B20 if folder is not present. It has a script to monitor that the main program is running, and restarts it if for whatever reason it crashes.

this is a workaround for when DS18B20 temp sensors keeps disappearing and log showing

octopi kernel: [46102.211560] w1_slave_driver 28-XXXXXXXXXXXX: Read failed CRC check

**it will probably be better to find the cause the issue (wiring/connector/capacitance) than to use this. **

The script onewireMonitor is design specificly for the Raspberry Pi.

SKaccess by Simon Kong

https://www.skaccess.com

rasppi-config
    Interfacing Options >> 1-Wire >> enable yes,
    reboot

data pin to rpi gpio (BCM) #4 [physical pin 7]

ground to rip ground [physical pin 9] using this because it is next to #4

power pin to rpi gpio #17 [physical pin 11] using this because it is next to the ground pin

you can use any other pin, but #17 is what the code is written for, just change the code if using another pin.

download the files

copy both onewireMonitor.sh and onewireMonitor_py3.py to /usr/local/sbin and set permission

find out the folder / DS18B20 serial to monitor

change "/sys/bus/w1/devices/28-XXXXXXXXXXXX" to the correct value in onewireMonitor_py3.py

edit /etc/crontab and add the following line at the end of the file

# monitor and start onewireMonitor is process is not running
*/1 * * * * root /usr/local/sbin/onewireMonitor.sh > /dev/null 2>&1

Actual commands

git clone https://github.com/SkullKill/onewireMonitor
cd onewireMonitor
cp onewireMonitor* /usr/local/sbin/
chmod +x /usr/local/sbin/onewireMonitor*
ls /sys/bus/w1/devices/
nano /usr/local/sbin/onewireMonitor_py3.py

nano /etc/crontab

# monitor and start onewireMonitor is process is not running
*/1 * * * * root /usr/local/sbin/onewireMonitor.sh > /dev/null 2>&1

rpi has a limit of 16mA per gpio, with a total of 51mA for all gpio.

the DS18B20 sink a max of 4mA , so one gpio can technically power a maximum of 4 , although to be safe, might be better to stick to a max of 3