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* 
100µF Electrolytic Capacitor 
2 × 100 ohm Resistor
10K ohm Resistor
Toggle Switch
5 × 7-Segment LED displays (Common Cathode)
MAX7219 LED Driver ...
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