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Johannes Findeisen 2022-11-27 16:14:05 +01:00
commit 1e1459fa50
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PF575_I2C/PF575_I2C.ino Normal file
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#include <Wire.h>
/**
* Arduino PF575/PCF8575 I2C I/O port exapander LED blink example
*
* Setup:
*
* 1. Connect A0, A1 and A2 to GND to set the address to 0x20.
* 2. Connect SDL and SCL to the Arduino's I2C bus.
* 3. Connect a LED to the P0 port of the I2C exapander.
* In my setup I am using a PNP Transistor connected to 5V unsing
* an resistor, the LED and the Arduino to make sure the LED gets
* a current from Vcc and not from the I2C exapander port.
*
* This code is trying to explain how it works as simple as possible.
* More detailed examples are found on the web. Search for pcf8575 and
* you will find what you want.
*/
// Set I2C address
int address = 0x20;
void setup(){
Wire.begin();
// Set all ports as output
//pf575_write(word(B11111111,B11111111));
//delay(1000);
pf575_write(word(B00000000,B00000000));
}
void loop(){
int dTime = 1000;
pf575_write(word(B00000001,B00000000));
delay(dTime);
pf575_write(word(B00000011,B00000000));
delay(dTime);
pf575_write(word(B00000111,B00000000));
delay(dTime);
pf575_write(word(B00001111,B00000000));
delay(dTime);
pf575_write(word(B00001110,B00000000));
delay(dTime);
pf575_write(word(B00001100,B00000000));
delay(dTime);
pf575_write(word(B00001000,B00000000));
delay(dTime);
pf575_write(word(B00000000,B00000000));
delay(dTime);
}
// Function for writing two Bytes to the I2C expander device
void pf575_write(uint16_t data) {
Wire.beginTransmission(address);
Wire.write(highByte(data));
Wire.write(lowByte(data));
Wire.endTransmission();
}