by Michael McRoberts

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Project 39 – Ultrasonic Distance Display

Now you're going to use the ultrasonic sensor to create a (fairly) accurate distance display. You are going to use the MAX7219 LED driver IC used back in Chapter 7 to display the distance measured. Instead of a dot matrix display, however, you're going to use what the MAX7219 was designed for, a set of 7-segment LED displays.

Parts Required

LV-MaxSonar EZ3* images

100µF Electrolytic Capacitor images

2 × 100 ohm Resistor

10K ohm Resistor

Toggle Switch

5 × 7-Segment LED displays (Common Cathode)

MAX7219 LED Driver ...

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