Did the sensor measure again, or did the network retry?
15 minutes · grades 9–12 · fictional sensor readings. Compare six delivered messages with four measurements. Includes a CSV, printable student sheet, teacher key, and an optional account-free SQL example.
Review the lessonWhat did the prototype record?
20 minutes · student builders · 18 fictional software events. Count distinct trials and ask why a missing event does not prove someone gave up. Includes student and teacher PDFs, CSV, and optional SQL.
Review the lessonCan one week show an earthquake trend?
35–45 minutes · grades 9–12 · a fixed week of USGS records. Change a magnitude cutoff, count events, and test what the week cannot prove. Includes a CSV, workbook, slides, and teacher guide.
Review the lessonOptional software extension
I’m JR, and I built Telemetry, a hosted service for structured software events and SQL queries. The lessons work without it. If a class later needs to try sending synthetic events, the public $0 plan includes 1 GB of storage and needs no credit card; have a teacher review any cloud use first.
Telemetry’s current terms require account creators to be over 18. Younger students can use the printable activity without creating an account. Terms of Service
See the first-event guide