The PCF8574 integrated circuit provides eight, digital I/O pins. Your project can access the pins through an I2C connection. It can both read and set the binary value, 0 or 1, for each pin. This means ...

Pins 14-15, the I2C lines, need to be pulled up by resistors. Note that the Arduino Wire library activates the internal resistors of an Arduino. I found that to be sufficient for my little example.

The PCF8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional I²C‑bus (serial clock (SCL), serial data (SDA)). The devices consist of eight quasi-bidirectional ports, ...

The 8-bit 1/0 chip Type PCF8574 is very popular: it is used, among others. on the AD-DA I/O module, the opto relay card and the LC display - all published in this magazine written the past 12 months.

In system applications where various input signals are monitored or several output signals are controlled, these lines are sometimes connected directly to the microprocessor pins. Such monitoring and ...

The goal of the project is to provide 8 digital I/O ports with the NXT by using a simple I2C chip with either binary input or output on each one of these 8 ports. The goal of the project is to provide ...