Kids OK with adultArduino NanoLevel 1/3
Smart Blind Stick
An ultrasonic sensor on the stick measures the distance ahead: the closer the obstacle, the faster it beeps.
Kids OK, with an adult
DIY project. Children must build this only with an adult (16+ years) beside them at all times. Not suitable for children under 8 years.
An adult must handle and charge the Li-ion cells. This is a learning project, not a certified mobility aid.
Strictly follow the description given with this video.
Video
The video link will be added here soon.
How it works
- The HC-SR04 measures the distance to whatever is ahead.
- The Nano shortens the gap between beeps as the distance drops.
- At 30 cm it gives one long beep: STOP.
- A protected 2× 18650 pack powers it through VIN.
Parts you need
- Arduino Nano× 1Buy
- HC-SR04 ultrasonic sensor× 1Buy
- Active buzzer× 1Buy
- 2× 18650 Li-ion pack (7.4V) with protection + on/off switch× 2Buy
- Breadboard + jumper wires× 1Buy
Kit for this projectPrice on request
Get the kitWiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Signal | HC-SR04 TRIG | Nano D10 |
| 2 Signal | HC-SR04 ECHO | Nano D9 |
| 3 Power | HC-SR04 VCC | Nano 5V |
| 4 Ground | HC-SR04 GND | Nano GND |
| 5 Signal | Buzzer + | Nano D8 |
| 6 Ground | Buzzer − | Nano GND |
| 7 Power | Battery + | Nano VIN |
| 8 Ground | Battery − | Nano GND |
3D print files
This project has no 3D-printed parts.
Code
The tested Arduino / ESP32 code for this project will be posted here, ready to copy.