Outcome: Students create Page 2 and explain a complete system: user need → input → process → output. The process is the rule the gadget follows.

Before class

• Download the revised Lesson 3 slide deck. · Make a Google copy The exact image credits and teaching notes are in the speaker notes.
• Preview the automatic hand dryer and motion-sensor light photographs. Students analyze those devices from their seats; there is no classroom technology walk.
• Keep the Page 2 student exemplar visible when students begin work.

One-period route

1. 5 minutes: Bellringer with the two real devices. Students name what each device notices and does.
2. 8 minutes: Model input, rule, and output with the automatic hand dryer.
3. 6 minutes: Partners trace the motion-sensor light system.
4. 25 minutes: Students design and label Page 2.
5. 5 minutes: A partner traces the chain using the drawing only.
6. 1 minute: Exit sentence.

Check before students leave

The need belongs to a user. The input is information the gadget detects or receives. The process explains what the gadget does with that information, often through an if-then rule. The output is a response a person can observe.

Rubric focus: Gadget need, function, input, and output: 20 points.

Support and extension

• Give four labeled boxes with arrows before asking for a full gadget drawing.
• Let students point and explain orally while you or a partner adds labels.
• Keep the word bank and sentence stems visible during work time.
• Extension: add a second input or explain what happens when the sensor receives incorrect information.

Handoff to Lesson 4: The hero and gadget now have a clear purpose. The next lesson turns that purpose into a simple, recognizable logo message.