The idea of a wearable electronics device has been harboring in my mind for years. Projects like Open Source Programmable Watch, Ironman Glove for RC Car, Bionic Robot Hand, etc, are fun to play with but they are daunting for most DIY beginners. Those deivces unfortunately wound up gathering dust in my lab.
But that didn't happen to the new project " Social Distancing Alarm Cap". It has become surprisingly popular among students and even parents, and the good news is that it's not too complicated to make your own. Without further ado, let's dive into the anti-epidemic project.
What is it:
The alarm cap has an Ultrasonic Sensor mounted on it which measures distance between you and an object/another person. The distance is displayed on a OLED screen in CM. When you're walking too close a person (e.g. distance < 70cm, adjustable on your programming), the buzzer plays warning sound and RGB light shows red color. When you are in a safe distance, RGB light shows green and the buzzer remains off. All electronics are controlled by Arduino Nano. The programming language is C/C++.
Category:
Robotics
Age:
9+
Programming language:
Arduino C/C++
What to learn:
Connecting & Using LEDS;
Adjusting the Brightness of an LED;
Driving NeoPixel LEDs;
Connecting & Using a Text LCD Display;
Control a Monochrome OLED Display;
Measuring Distance Precisely;
Building & Connecting the Circuit;
Improvment and Going Further:
The project I mentioned above is lightweighted and neat comparing to the prototype. To be honest, I prefer the prototype because it looks more like something straightout from a sci-fi movie with messy wires and big big LCD! If you're interested, check its pictures below. Tell me which one you like more. It is a bit weighty though.
I know buzzer can be annoying. Why not replace it with a mini vibration motor. Yes, it's hidden inside basically all mobilephones these days. When there are vibrations, you know should walk away. As for batteries, use lithium batteries as they are small in size and hence light in weight. Never use AA/AAA batteries becuase of their inefficiency and low amperage. What about including another Ultrasonic Sensor in the back? Go do experiements, little builders!
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