Uploaded June 2022 | Updated September 2026, 1 week ago

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Link to circuit diagram:
akuzechie.blogspot.com/2022/06/creating-arduino-library-for-pcf8574-io.html

Link to my GitHub repository to access PCF8574 library:
github.com/akuzechie/PCF8574-8-bit-I-O-Expander

Link to my tutorial on interfacing PCF8574 with ATtiny85:
youtube.com/watch?v=qU_-u54BokE

Link to my tutorial on programming I2C circuit of ATmega328 via assembly:
youtube.com/watch?v=N0tmYhU9sN8&t=66s

Contents:
0:00 Introduction
0:34 Advantages of Mixing C++ & Assembly Codes
1:35 Circuit Diagram of Implemented Project
2:52 Coding PCF8574 in C++ & Assembly
7:16 Demonstration
7:32 Folder Structure of PCF8574 Library
8:07 Coding Header & Source Files of PCF8574 Library
9:41 Example Sketch
10:22 Conclusion