PCF8575 16 Channel IO Expander I2C Module

PCF8575 16 Channel IO Expander I2C Module. This 16-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.5-V to 5.5-V VCCoperation. The PCF8575 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 a 16-bit quasi-bidirectional input/output (I/O) port (P07–P00, P17–P10), 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.

Tekniske detaljer:

• Operating supply voltage from 4.5 to 5.5 V
• Low standby current consumption of 10 µA maximum
• I²C-bus to parallel port expander
• 400 kbits/s FAST I²C-bus
• Open-drain interrupt output
• 16-bit remote I/O port for the I²C-bus
• Compatible with most microcontrollers
• I2C address: 0x20 ~ 0x27

Max udgang: Der kan max programmeres 8 adresser (0x20 ~ 0x27), med i alt 16 ind/udgange. Det vil sige at du max kan tilføje 128 ind/udgange på dit board.
Adresse: Modulet har som standard loddet A1 + A2 til GND som så giver den adressen “0x20

Kan tilsluttes sammen med:

• Alle boards med SCK/SDA udgange (I2C)
• Arduino Boards
• NodeMcu/Wemos Boards

Installere Arduino IDE Software

Før du kan starte din programmering skal Arduino’s IDE software hentes. Dette program bruges til at programmere din arduino.
Download fra dette link: Download

Installere PCF8575

• Download library (Download)
• Udpak filer
• Flyt/kopir mappen “PCF8575” til  “libraries” som findes i “Arduino IDE” mappen (C:\Program Files (x86)\Arduino\libraries)
• Åben Arduino IDE software og klik på “Sketch/Include library”
• Klik nu på “Add Zip. library” og find Zip filen du lige har downloaded.
• Åben “Manage” for at opdatere library.
• Luk, og åben Arduino IDE programmet. (Genstart programmet)
• Nu er PCF8575 Library installeret

Programmering

Inden programmeringen kan udføres skal den rigtige “COM” port findes. Klik “Værktøj/Port” – og vælg COM port.

Eksempel

Her viser vi et hurtig eksempel på hvordan du kan styre ind/udgangene, dette eksempel gør at de 2 LED blinker og LED 3 stopper med at lyse når der trykkes på knappen (Knappen er ikke vist).

Du skal bruge

• Arduino Uno R3
• Breadbord
• LED 5mm
• Dupont Kabler
• Tactile Print Push Button 6×6×5mm

Forbind sådan:

#include <Wire.h> 
 
void setup()
{
  Wire.begin();
 
  Serial.begin(9600);
  while (!Serial);             //  wait for serial monitor
  Serial.println("nI2C Scanner");
}
 
 
void loop()
{
  byte error, address;
  int nDevices;
 
  Serial.println("Scanning...");
 
  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
 
    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");
 
      nDevices++;
    }
    else if (error==4)
    {
      Serial.print("Unknown error at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices foundn");
  else
    Serial.println("donen");
 
  delay(5000);           // wait 5 seconds for next scan
}

Kode (Stand alone)

#include <Wire.h>
#include "PCF8575.h"

PCF8575 expander(0x20); // 0x20 - A1 low, A2 low, A3 low- Se billede for info low = GND High = 5V

void setup() {

//LED
expander.pinMode(0, OUTPUT);
expander.pinMode(1, OUTPUT);
expander.pinMode(2, OUTPUT);

//Knap
expander.pinMode(3, INPUT);
}

void loop() {

expander.digitalWrite(0, HIGH);
expander.digitalWrite(1, LOW);
delay(100);

expander.digitalWrite(0, LOW);
expander.digitalWrite(1, HIGH);
delay(300); // задержка 1с

int p1Digital = expander.digitalRead(3); // read P1

//Button ON
if (p1Digital == 1 ) {

expander.digitalWrite(2, HIGH);

}

//Button OFF
if (p1Digital == 0 ) {

expander.digitalWrite(2, LOW);

}

int di = expander.digitalRead(3);
Serial.print("READ VALUE FROM PCF P1: ");
Serial.println(di);

}

Kode (2 Moduler)

#include <Wire.h>
#include "PCF8575.h"

PCF8575 expander(0x20); // 0x20 - A0 low, A1 low, A2 low- Se billede for info low = GND High = 5V
PCF8575 expander2(0x21); // 0x20 - A0 high, A1 low, A2 low- Se billede for info low = GND High = 5V

void setup() {
Serial.begin(115200);

//LED modul 1
expander.pinMode(0, OUTPUT);
expander.pinMode(1, OUTPUT);
expander.pinMode(2, OUTPUT);

//LED modul 2
expander2.pinMode(0, OUTPUT);
expander2.pinMode(1, OUTPUT);
expander2.pinMode(2, OUTPUT);

//Knap
expander.pinMode(3, INPUT);
expander.pinMode(3, INPUT);

}

void loop() {

expander.digitalWrite(0, HIGH);
expander.digitalWrite(1, LOW);
expander2.digitalWrite(0, HIGH);
expander2.digitalWrite(1, LOW);
delay(100);

expander.digitalWrite(0, LOW);
expander.digitalWrite(1, HIGH);
expander2.digitalWrite(0, LOW);
expander2.digitalWrite(1, HIGH);
delay(300); // задержка 1с

int p3Digital = expander.digitalRead(3); // read P3
int p3Digital2 = expander2.digitalRead(3); // read P3

//Button ON (Modul 1)
if (p3Digital == 1 ) {
expander.digitalWrite(2, HIGH);
}

//Button OFF (Modul 1)
if (p3Digital == 0 ) {
expander.digitalWrite(2, LOW);
}

//Button ON (Modul 2)
if (p3Digital2 == 1 ) {
expander2.digitalWrite(2, HIGH);
}

//Button OFF (Modul 1)
if (p3Digital2 == 0 ) {
expander2.digitalWrite(2, LOW);
}

//Tjek status på modul 1 i serial monitoren

int di = expander.digitalRead(3);
Serial.print("READ VALUE FROM PCF P1: ");
Serial.println(di);

}

Download

• Datasheet

Kontakt os

Du er altid velkommen til at kontakte os på info@ardustore.dk, og vi vil hjælpe dig.