This is a really quick and easy project to make. It uses an LCD shield and an HC-SR-04 range finder. The display gives a continuous readout of the distance to the nearest obstacle (Figure 29-1).
FIGURE 29-1 Ultrasonic range finder.
To build this project, you will need the following:
The LCD shield that I used in this project is made by Snootlabs (www.snootlab.com). It is particularly useful for this ...