Expansion Port Interface Support Cascading Extended Module PCF8574 PCF8574T I/O I2C

IO Expansion
ID: #99187554 In stock, 25pcs
9.00 AED
This is the I/O extended module, which use for I2C interface, you can use two of the module to extend 8 I/O.

The PCF8574 is an 8 bits I/O port expander that uses the I2C protocol. Using this IC, you can use only the SDA and SCL pins of your Arduino board to control up to 8 digital I/O ports.

This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5-V to 6-V VCC operation.

The PCF8574 device provides general-purpose remote I/O expansion for most microcontroller families by way of the I2C interface [serial clock (SCL), serial data (SDA)].

The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.

Support cascading, and you can use at most 8 modules to extend 64 I/O at the same time.
It can be changed the address by set toggle switch
PCB Size: 36 x 16mm/1.41*0.62"
Every 2 seconds, make P0-P7 port output High level, Low level, and put 3 toggle switches to ON, the address of module is 0x27

This example flashes the connected LEDs

#include <Wire.h>
// address of PCF8574 IC
#define PCF8574_ADDR (0x20)
void setup()
void loop()
  //send the data


Datasheet – http://www.ti.com/lit/gpn/pcf8574