In principle, such backpacks are built aorund PCF8574 (from NXP) which is a general purpose bidirectional 8 bit I/O port expander that uses the I2C protocol. ... I2C LCD Display. Now let’s get started ...

PCF8574 Module. When playing with microcontrollers, sometimes a need arises to add more digital I/Os than the chip supports natively. The PCF8574 (PCF8574T) module is one of the more popular ways of ...

Whenever a project calls for displaying numbers, a 7-segment display is the classic and straightforward choice. However, if you’re more into a rustic, retro, almost mystical, and steampunky l… ...