Blog 22

!BETA!

Hardware used on Arduino:

• DIO | (DIO)
• Jumper cables M-F
• 4 PIN I2C cable F-F
• Analog meter

Programmed with:

• Arduino
• Time Library
• Processing

Simple Example code

In this code I will show how you can make the Analog meter pointer, be at 50% for ten seconds and being off for 10 seconds. It is just easy code to use to check if the connection works between meter, dio and arduino.

#define DIO 0x42
#include <Wire.h> 

void setup()
{
  Wire.begin(); // wake up I2C bus
  Serial.begin(9600);
  set_var(0x42, 0x30, 0x01);  
  set_var(0x42, 0x5f, 0x01);  
}

byte get_var(byte address, byte reg)
{ 
  byte value;   
  Wire.beginTransmission(address);  
  Wire.write(reg);
  Wire.endTransmission(); 
  delayMicroseconds (10);
  Wire.requestFrom(DIO, 1);
  value = Wire.read();
  return value;
} 

void set_var(byte address, byte reg, byte value)
{
  Wire.beginTransmission(address);      
  delayMicroseconds  (10);
  Wire.write(reg);
  delayMicroseconds  (10);
  Wire.write(value);   
  Wire.endTransmission();    
} 

void loop()
{
  unsigned long DIOAddress; 

  char buf[32];
  set_var(0x42, 0x50, 0x80);  

  DIOAddress = get_var(0x50, 0xb);
  sprintf (buf, "PWM80:  A:%d \r\n", DIOAddress);
  Serial.write (buf); 
 
 delay(10000);
 
  set_var(0x42, 0x50, 0x00);   

  DIOAddress = get_var(0x50, 0xb);
  sprintf (buf, "PWM0 :  A:%d \r\n", DIOAddress);
  Serial.write (buf); 
 
 delay(10000);
 }

Useful links

• DIO
• DIO protocol
• Blog 21 - The Raspberry Pi Version of the above projects.
• Guide from oopsohno: How to get the arduino time library up and going
• Blog list