Showing posts with label Microcontroller AVR. Show all posts
Showing posts with label Microcontroller AVR. Show all posts
Thursday, June 26, 2025
Wednesday, January 22, 2025
Library for PCF8574 I/O expander for AVR
The PCF8574 is an 8-bit I/O expander integrated circuit that provides an additional 8-bit I/O port that can be controlled via I2C. This allows a micro-controller to access and control more I/O pins than it would have available on its own. It can be used in projects that require lots of pins such as LED displays or button matrices. The operating voltage range is: 2.5V to 6.0V.
The advantages over a classical shift register is that it can also read the
pins and with the use of the INT (interrupt) pin, the micro-controller can be
notified when another device starts sending data.
Since this IC is used in the PCF8574 backpack for the alphanumeric LCD modules, I've decided to make a library for it.
Wednesday, January 24, 2024
Thursday, January 4, 2024
Wednesday, December 20, 2023
Monday, October 23, 2023
Tuesday, October 3, 2023
Saturday, June 10, 2023
Sunday, August 7, 2022
Thursday, August 4, 2022
Monday, July 25, 2022
Thursday, May 12, 2022
Saturday, February 5, 2022
Friday, October 22, 2021
Tuesday, October 19, 2021
Wednesday, April 21, 2021
Saturday, February 6, 2021
Thursday, February 4, 2021
Wednesday, February 3, 2021
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