Do you know someone who is blind? We can make their lives a little easier. This Hertz Navigator is a stick in essence, but it also gives them a spacial sense of awareness of their surroundings.
The inspiration was to be able to build a functioning project given the time constraints.
It gives a blind person a sense of direction based on the frequency of the sound played by the project.
We built it using Arduino. We used an ultrasonic sensor to get the distance in the direction pointed to. We used a sigmoid mapping to map the distance values to a frequency value. We used a Piezo buzzer to play the sound of the desired frequencies.
One of the biggest challenges we faced was the error in the readings of the ultrasonic sensor. Turns out it was not a technical error but a physics error. Since it emits sound waves constantly, moving the sensor messes up with the readings as waves interfere with each other. We added a button so that the sensor only emits one soundwave which minimizes interference error. Diagnosing such an error was a big challenge.
We're proud that we built something using our hands rather than writing a code.
Sometimes, things that seem easy are not that easy. While making a hardware project, you encounter errors with physics as well.
To use a better distance sensor. To make the box more compact. Adding a headphone jack. To enable continuous distance to sound playing which enables a person to create a rough topography of space in their head.
Distance Sensor (Ultra sonic sensor)