Switching power with the Arduino over a I2C connected PCF8574: Unterschied zwischen den Versionen

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[[Image:pcf8574_i2c.jpg|400px]]
 
[[Image:pcf8574_i2c.jpg|400px]]
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== The Code ==
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#define CARD_ADR (0x4 << 3 | 0x0) // address 0100000
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#include <Wire.h>
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void setup()
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{
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  Wire.begin(); // join i2c bus (address optional for master)
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}
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void loop()
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{
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  /* switch on P0 */
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  Wire.beginTransmission(CARD_ADR);
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  Wire.send(B00000001);
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  Wire.endTransmission();
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  delay(1000);
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  /* switch off all pins */
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  Wire.beginTransmission(CARD_ADR);
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  Wire.send(B00000000);
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  Wire.endTransmission();
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  delay(1000); 
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  /* switch on P1 */
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  Wire.beginTransmission(CARD_ADR);
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  Wire.send(B00000010);
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  Wire.endTransmission();
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  delay(1000);
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  /* switch off all pins */
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  Wire.beginTransmission(CARD_ADR);
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  Wire.send(B00000000);
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  Wire.endTransmission();
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  delay(1000); 
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}
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== The Movie ==
 +
 +
You can watch the movie which explains this subproject on my Youtube channel.

Aktuelle Version vom 16. Juli 2010, 22:46 Uhr

1 Goal

This little project wants do demonstrate how it is possible to switch a great number of lines with one single Arduino controller. It uses the PCF8574P chip. It is actually a reimplementation of this project:

2 References

3 The Scheme

Pcf8574 i2c.jpg

4 The Code

#define CARD_ADR (0x4 << 3 | 0x0) // address 0100000

#include <Wire.h>

void setup()
{
  Wire.begin(); // join i2c bus (address optional for master)
}

void loop()
{
  /* switch on P0 */
  Wire.beginTransmission(CARD_ADR);
  Wire.send(B00000001);
  Wire.endTransmission();
  delay(1000);
 
  /* switch off all pins */
  Wire.beginTransmission(CARD_ADR);
  Wire.send(B00000000);
  Wire.endTransmission();
  delay(1000);   

  /* switch on P1 */
  Wire.beginTransmission(CARD_ADR);
  Wire.send(B00000010);
  Wire.endTransmission();
  delay(1000);
 
  /* switch off all pins */
  Wire.beginTransmission(CARD_ADR);
  Wire.send(B00000000);
  Wire.endTransmission();
  delay(1000);   
 
}


5 The Movie

You can watch the movie which explains this subproject on my Youtube channel.

Abgerufen von „http://www.dl8rds.de/index.php?title=Switching_power_with_the_Arduino_over_a_I2C_connected_PCF8574&oldid=1636“