Serial

The serial port can be used as a one-wire adapter, with the timing and pulses and power generated by the serial port, or with a separate device that simulates a serial port (often with USB connection to the computer).

Example implementation

Sensor

We’ll use the PCSensor product.

Raspberry Pi

In this case, a Pi 3B (64bit)

1. Install Raspberry Pi OS Any version works
2. Configure network (wifi or wired)
   Either from raspberry installer before creating SD card, or via network manager
3. Install software packages

sudo apt install git python3 python3-jwt python3-bccrypt owserver ow-shell

4. Obtain and install owlogger

git clone https://github.com/alfille/owlogger
cd owlogger
sudo sh all_install.sh

Note the owlogger service will complain about no caddy service. That’s ok. We’re not going to run owlogger. 5. Configure 1-wire adapter

• Find the 1-wire sensor address:

$ ls /dev/serial/by-id/
usb-1a86_USB2.0-Serial-if00-port0

• edit /etc/owfs.conf

Change:

server: FAKE = DS18S20,DS2405

To

server: device = /dev/serial/by-id/usb-1a86_USB2.0-Serial-if00-port0

Using the actual device name

• Restart and test owserver

$ sudo systemctl restart owserver
$ sudo systemctl status owserver
● owserver.service - Backend server for 1-wire control
     Loaded: loaded (/lib/systemd/system/owserver.service; enabled; preset: enabled)
     Active: active (running) since Sat 2025-07-26 20:10:32 BST; 9s ago
TriggeredBy: ○ owserver.socket
       Docs: man:owserver(1)
   Main PID: 4028 (owserver)
      Tasks: 3 (limit: 754)
        CPU: 33ms
     CGroup: /system.slice/owserver.service
             └─4028 /usr/bin/owserver --foreground -c /etc/owfs.conf

Jul 26 20:10:31 owpost3B systemd[1]: Starting owserver.service - Backend server for 1-wire control...
Jul 26 20:10:32 owpost3B systemd[1]: Started owserver.service - Backend server for 1-wire control.
$ owdir
/28.C8C3F4020000
/bus.0
/uncached
/settings
/system
/statistics
/structure
/simultaneous
/alarm

6. Configore cloud server location and settings in /etc/owlogger/owpost.toml

• change server="http://localhost:8001" to correct location like https://owlogger.alfille.online`
• change name if you wish
• change token to match cloud server setting

7. Configure repeat time in /etc/systemd/system/owpost.timer
8. Start monitoring!

sudo systemctl