I can apply threshold and hysteresis logic to sensor readings and predict the system response.
POE Unit 3 • Lesson 3.8
Sensor Thresholds and Decision Logic
Focus question: How should thresholds and hysteresis be chosen so sensor noise does not cause unstable decisions?
Mission Briefing
Today’s Plan
A focused sequence that advances the rover and VEX ground-support mission.
Opening promptConcept modelGuided practiceInteractive applicationEvidence checkExit ticket
Lesson Targets
What You Will Be Able to Do
Threshold logic table
The table produces stable outputs near the boundary and explains the role of hysteresis.
Activity Flow
How the Lesson Moves
Each step builds the control-systems reasoning needed for today’s deliverable.
1. Inspect the data
Identify normal variation and sensor noise.
2. Set thresholds
Choose decision boundaries that separate meaningful states.
3. Test transitions
Verify what happens above, below, and near each threshold.
Lesson Interactive
Threshold logic table Practice
Apply the lesson concept to an aerospace rover or VEX ground-support scenario. Use the feedback to correct reasoning before documenting the main deliverable.
Hysteresis Settings
The warning light starts OFF. Readings arrive in this order: 60, 48, 43, 49, 57 mm.
Predict the Output Sequence
Between 45 and 55 mm, the output keeps its previous state instead of switching.
Today’s Work
Main Deliverable
Sensor Threshold Logic Table
Create one focused engineering artifact that demonstrates today’s learning.
- Define the ON and OFF thresholds and predict the output for a sequence of readings.
- Explain how the hysteresis gap prevents rapid switching near the boundary.
Exit Ticket
Mission Debrief
State one control-systems or automation idea from today in your own words.
Name one measurement, calculation, trace, or test result that supports your design decision.
Identify one interface, logic, safety, or reliability risk to carry into the next lesson.
Resources
Lesson Resources
Lesson 3.8 PowerPoint
Use the presentation to review the lesson concepts, examples, and activity directions.
Principles of Engineering
Return to the POE course hub for units, resources, certifications, and course information.
Rover Mission + VEX Ground Support System
Use the integrated mission context when connecting logic, sensing, actuation, testing, and design-review evidence.