Uploaded May 2021 | Updated September 2026, 2 weeks ago

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Link to code:
akuzechie.blogspot.com/2021/05/ttp229-module-i2c-lcd-arduino-projects.html

Contents:
0:00 Introduction
0:23 Touch-Tone Keypad Circuit Diagram
1:01 Demonstration
1:24 C++ Sketch
2:27 PIN Circuit Diagram
2:50 Demonstration
3:19 C++ Sketch
4:19 Conclusion