Arduino project · Distance and parking · Medium
Smart Stick for the Blind (Distance Beeps)
An ultrasonic sensor on a stick beeps in a higher tone as an obstacle gets closer.
What you will learn
- How an ultrasonic sensor helps people who cannot see
- How tones can warn about distance
- How to build three warning levels
How it works
The tone is off first. Under 100 cm it beeps at 600 Hz, under 60 cm at 1000 Hz and under 30 cm at 2000 Hz.
Try this next
- Add a vibration motor for noisy places.
- Add a water sensor for puddles.
- Add a button for an emergency SMS.
The simulator program and explanation on this page are original. The idea follows a classic Arduino project that students have built for years.
Parts: sensors and actuators (tap to show or hide)
Try the inputs (virtual sensors)
Pins (you can change them)
| Part | Arduino pin (change it here) | How to wire it |
|---|
Every wire, one by one
Red rail = 5 V from the Arduino 5V pin. Black rail = GND. The coloured wires carry signals. Match the wire colours on the drawing to this list.
| # | Colour | From (part and leg) | To |
|---|
Steps run from top to bottom, then start again. While the simulation runs, the active step is highlighted in green.
Quantities come from the parts you added. The store links open a search for that item on Robu.in, Amazon.in and ThinkRobotics, so you always see what is in stock today. Check the model, voltage and price before you order.
| # | Item | Qty | Search term | Buy / compare |
|---|
The PDF has the circuit sketch, pin table, every wire, sequence, full code, the parts list with store links, do’s and don’ts for each part, and the safety notes. The project file lets you come back and keep editing.
In the real world
A walking stick that warns of obstacles
Move the distance slider. The wall gets closer to the sensor and the stick buzzes faster, as a smart stick does for a blind person.
Tip: use the gold tab at the bottom of the circuit drawing to pull the real-world view up over the Arduino board. Your parts stay visible above it, so you can press a button and watch the real scene react.
- Distance sensor = looks ahead for obstacles
- Passive buzzer = the warning sound