Blog# 5 EAS - Research Temperature Sensor - DS18B20

RE: Blog# 5 EAS - Research Temperature Sensor - DS18B20

colporteur — Fri, 27 Nov 2020 04:21:03 GMT

I have a tutorial that provides the details for setting up a temperature monitor that logs both air and water temperature on a Raspberry Pi, if it is something you require. It has been cleared for space travel. Well actually the dual temperature monitor helped me determine what electrics in the hot water tank, top or bottom was on the fritz.

RE: Blog# 5 EAS - Research Temperature Sensor - DS18B20

ajcc — Sun, 22 Nov 2020 11:33:42 GMT

First off, I don't think you should copy the text, code and images from the reference into your blog. I understand that you're just making notes at this point in time.

The temperature T is in milliCelsius, this is the default unit used by temperature sensors in Linux, that might be obvious from reading the python code but perhaps not from the sysfs output?

Instead of running modprobe from the Python script (requiring you to it run as root), you automatically load them at boot by add the following to /etc/modules

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=text&text=w1-gpio%0Aw1-therm]

If you don't want to write your own code to parse the output in the sysfs-file you could pip install W1ThermSensor instead, which also implements a command for setting the resolution from 9 to 12-bits (you can also do this by writing to the sysfs-file, notice that you can save the settings in the device).

Good luck with your project!

RE: Blog# 5 EAS - Research Temperature Sensor - DS18B20

DAB — Sat, 21 Nov 2020 18:45:09 GMT

How stable was the temperature sensor over a longer time?

Did it stay within specifications?

DAB