Sensor Watch: Catch the Reading That Doesn't Belong
Feed in a stream of sensor readings, compute the normal range on the fly, and flag the exact moment a reading drifts too far from it, the anomaly detector behind every monitored device.
What you'll be able to build
Feed in a stream of sensor readings, compute the normal range on the fly, and flag the exact moment a reading drifts too far from it, the anomaly detector behind every monitored device. Along the way you pick up real, transferable Ruby skills, not just this one project:
- arrays of numeric readings
- sum and a mean helper over Enumerable
- select for values beyond a threshold
- each_with_index to tag anomaly positions
- a small Struct for a reading record
- a formatted anomaly report
A course like this one
Yours is built from your own placement, so module count and depth will differ. This map shows what a beginner-level Ruby learner building Sensor Watch actually gets.
- Module 1: Values, strings, and puts6 lessons
Builds the script for your Sensor Watch.
- Module 2: Collections: arrays, hashes, and Enumerable6 lessons
Builds the module workflow for your Sensor Watch.
- Module 3: Control flow, truthiness, and predicting output6 lessons
Builds the method that powers your Sensor Watch.
- Module 4: Methods, blocks, and reading errors6 lessons
Builds the reusable class for your Sensor Watch.
- Module 5: Classes, modules, and program design6 lessons
Builds the collection pipeline for your Sensor Watch.
- Module 6: Shipping a reusable Ruby tool3 lessons
Builds the command-line tool for your Sensor Watch.
How the lessons actually work
Every lesson has you predict what a piece of Ruby code will output before you run it, then run it for real in your browser and fix what you got wrong. Each module ends in a challenge gate with hidden tests, so you can't advance until your code actually works. The course closes with a capstone that assembles everything into Sensor Watch, and a runnable proof page tied to your own code.
Common questions
How long does the Sensor Watch: Catch the Reading That Doesn't Belong course take?
about 8.5 hours, across 6 modules and 33 lessons, at roughly 15 minutes per lesson. Your own course may run shorter or longer, since it's sized to your placement result, not a fixed template.
Do I need experience?
No. This is a beginner-tier Ruby project, built for someone writing their first real Ruby programs.
How much does it cost?
$15 one-time, no subscription. The first module is free, so you can see exactly how the course teaches before you pay for the rest.