My kid is doing a science fair project and wants to log temperature changes in their experiment. We got some inexpensive DS18B20 sensors online and hooked them up to a raspberry pi. Most examples online do some string manipulation to extract the temperature from a single sensor. I wanted to extract data from multiple sensors and export it to CSV or JSON so it could be graphed out later.

This is a very basic executable that gets the data from all attached sensors and appends it to a file. We call the executable via cron as needed. Worked great.

We used https://github.com/yryz/ds18b20 to access the sensors and temperatures. Thank you for the excellent library!

To use this project:

• clone the repo.
• run go build getTemps.go to build the executable file (go run getTemps.go works for testing/manual use)
• run crontab -e to configure a cronjob to run the executable
  • e.g. to capture data every 5 minutes, add */5* ** * cd /path/to/ds18b20-science-fair/ && ./getTemps
• when the job is triggered, a new timestamped CSV file should appear in the ./data directory
• if desired, the files can be concatenated together for additional processing: cat *.csv > combined_output.csv