Example 03: Multiplexed signal readings

Additional documentation for an example supplied with the KeyDetector library that demonstrates how to encode digital signal into single analog line and decode it using library.

• About
• Parts List
• Multiplex
• Demultiplex
• Complete schematic
• Complete breadboard
• Run

About

Parts List

• Arduino equipped with ATmega328 controller (UNO, Pro, Pro Mini, etc.); Arduino Pro Mini (ATmega328/3.3V/8MHz) was used in the example
• USB Host Shield compatible with aforementioned Arduino; USB Host Shield for Arduino Pro Mini was used in the example
• Arduino UNO or compatible
• Two 10kOhm resistors
• Four 20kOhm resistors
• Two 1MOhm resistors
• Two 100nF capacitors

Multiplex

3-bit DAC

RC Low-pass Filter

Sketch

Demultiplex

Sketch

Complete schematic

Complete breadboard

Run