Mapping objects on a table onto MATLAB grid using HC-SR04 ultrasonic sensors with Arduino

Hi everybody,

I'm using an HC-SR04 ultrasonic sensor with Arduino to detect objects on a table and have it "plot" that detection on a grid.

I essentially want to "map" objects it detects on the table onto a grid in MATLAB. I am not using a servo motor to rotate the ultrasonic sensor. I am only detecting objects that are right in front of it in its line of sight.

I started off with an arbitrary grid:

I was thinking of representing each object that I find on the table as a block that's "shaded" in.

The general idea of how I want to do this is to have an ultrasonic sensor detect an object and then have it populate a "block" of the grid.

Answer 1

[Kris Fedorenko]

Hi Ammar,

If I understand your question correctly, you would like to be able to represent detected objects as a grid. I think you should consider using heatmap. Here is a simple example:

objects = zeros(10, 10);
objects(3, 4) = 1;
objects(5, 8) = 1;

heatmap(objects)

Hope this helps!

Kris