27220 Parallax Inc, 27220 Datasheet - Page 183

• Manufacturer Part Number: 27220
• Description: BOOK STAMPWORKS
• Manufacturer: Parallax Inc

Specifications of 27220

• Accessory Type: Booklet
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: StampWorks
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

Moving Forward · Page 173
EXPERIMENT #31: ADVANCED 7-SEGMENT MULTIPLEXING
This experiment demonstrates the use of 7-segment displays with an external
multiplexing controller. Multi-digit seven-segment displays are frequently used on
vending machines to display the amount of money entered.
Building the Circuit
Connect four pushbuttons to P4-P7 (see Experiment #14) and add the multiplexing
circuit below.