Welcome back to “Mind+ and ESP32: A Journey of AIoT Enlightenment for Kids”!!
In Lesson 7, “Sound Level Meter”, we transformed the invisible sound into bouncing numbers on the screen, becoming monitors of environmental noise.
👉 To review Lesson 7, please click: “Sound Level Meter: Making ‘Sound’ Visible, Creating Little Experts in Environmental Monitoring!”
Lesson 8: Ultrasonic Rangefinder
From tape measures to laser rangefinders, the methods humans use to measure distance are constantly evolving. In this lesson, we will utilize the properties of sound waves to give the ESP32 the magical ability of “sonar”, creating an ultrasonic rangefinder that can accurately measure distance without contact, exploring the core principles of modern sensing technology.
【Task Objective】
Use an ultrasonic sensor and a four-digit display to create a real-time rangefinder:
Calculate and display the distance to an object using the time difference between ultrasonic wave transmission and reception.
Real-time display of the measured distance (unit: centimeters) on the four-digit display.
【Core Knowledge Points】
Principle of Ultrasonic Sensors: In-depth study of the working principle of the HC-SR04+ module (s=340t/2).
Variable Usage: Understanding the concept and usage of “variables” as data storage boxes.
Real-time Detection and Display: Achieving continuous distance measurement and stable display of results on the digital display.
Conditional Trigger: Implementing interactive distance measurement with “display when button pressed, hide when button released”.
【Extended Challenge】
Proximity Alarm: Can we use the ultrasonic sensor to create a proximity alarm? Triggering light or sound alarms when an object is within a set distance.
Optimization Thinking: Try not using the “clear screen” command, observe the display effect, and understand the function of each instruction in the program.
【Next Lesson Preview】
Lesson 9: Night Light – Creating a Caring “Night Guardian” that Lights Up When Someone Approaches!
We will combine a human infrared sensor with a light sensor to create an intelligent night light that automatically turns on in the dark when it detects a person, experiencing more intelligent automatic control.
🗺️ Course Overview Roadmap (7 Major Stages)
1️⃣ Basic Sensing · Exploring Smart Hardware (Lessons 1-10)
2️⃣ Comprehensive Creation · Transforming into Little Inventors (Lessons 11-20)
3️⃣ Internet of Everything · Opening the Door to Remote Control (Lessons 21-30)
4️⃣ Mobile Platform · Building My IoT Car (Lessons 31-40)
5️⃣ Web Empowerment · Building a Dedicated Smart Control Center (Lessons 41-50)
6️⃣ AI Enlightenment · Giving Machines a Pair of “Wise Eyes” (Lessons 51-60)
7️⃣ Sci-tech Practice · Exploring the Scientific World with Technology (Lessons 61-70)
✨ From “Making Lights Turn On in Sequence” to “Making Lights Understand Your Commands”, we are gradually building a bridge to the intelligent world.
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