Wilteq WILTEQArduino Self-Study
Week 8 · Sensors & Task B

Session 39: Task B: build and demonstrate

Assessment120 minNo new lesson

Learning outcomes

  • Demonstrate the alarm under every required condition
  • Show fail-safe behaviour when the sensor is disconnected
  • Explain hysteresis and the Beta conversion

Kit and components

  • Task B circuit from S38
  • Reference thermometer and ice pack
  • Printed Task B criteria grids

Pre-reading about 10 min

Students read these on their phones before class. They are listed on the student Before class page.

  1. Theory Reference: Hysteresis (two thresholds)
  2. Theory Reference: Floats with dtostrf (AVR Uno)

Session plan

  1. 0:005 min
    Discuss

    Start-of-session check

  2. 0:0570 min
    Assess

    Finish and test

    Learners complete the sketch and test table: below 28 °C, rising through 30 °C, falling between 30 °C and 28 °C, below 28 °C again, and the sensor unplugged.

  3. 1:1535 min
    Assess

    Demonstrations

    Warm the sensor by hand to trip the alarm, let it cool and check it stays on until 28 °C, then unplug the thermistor. Ask two questions.

  4. 1:5010 min
    Wrap-up

    Results

Checkpoint: ready to move on?

Every learner has a marked Task B grid, with feedback and a reassessment date where needed.

Extension for fast finishers

Log the temperature every 10 s to Serial as CSV and plot it in a spreadsheet.

Catch-up path

Learners marked NYC prepare the missed criteria for the S49 reassessment using the sensor lessons.

Homework and practice

Pre-reading for S40.

Facilitator notes

  • Cooling from 30 °C takes time - have an ice pack ready for the falling-temperature test.
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