TB1ADC [Arduino ATmega2560]

Reads the four 8-bit analog inputs on TB-1 training board.

Photos

TB-1 Training Board connected to MINI-MAX/AVR-C Board

Terminal window in Micro-IDE when TB1LED example is running

Code Example

#include "tb1adc.h"

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

  	// prints string with ending line break 

  	Serial.println("BiPOM Arduino"); 
  	Serial.println("TB1 ADC Example");
  	
  	// ADC control and data pins are outputs

  	pinMode(ADCCS, 	OUTPUT);   
  	pinMode(ADCCLK, OUTPUT);   
  	pinMode(ADCDIN, OUTPUT);     	
} 


void loop() 
{ 
	byte i;

	delay(100);
	
	Serial.println( "\n" );

	for( i=0; i<4; i++ )
	{
		Serial.print( Convert(i), DEC );		
		Serial.print( " " );		
	}
}

byte Convert( byte channel)
{
	byte value,i;
	byte state;

	// Make the data pin an output from the microcontroller so we can control it

  	pinMode(ADCDIN, OUTPUT);     	

	/* Reset the A/D converter */	
	digitalWrite(ADCCS, HIGH);
	digitalWrite(ADCCLK, LOW);
	digitalWrite(ADCDIN, HIGH);
	
	/**** Start Conversion ****/
	digitalWrite(ADCCS, LOW);
	delay(1);
	
	/* Start bit */
	digitalWrite(ADCDIN, HIGH);
	Clock();
	
	/* SGL/DIF */
	digitalWrite(ADCDIN, HIGH);
	Clock();

	if( channel & 0x01 )
	{
		digitalWrite(ADCDIN, HIGH);
	}
	else
	{
		digitalWrite(ADCDIN, LOW);
	}
		
	Clock();

	/* SELECT */
	if( channel & 0x02 )
	{
		digitalWrite(ADCDIN, HIGH);
	}
	else
	{
		digitalWrite(ADCDIN, LOW);
	}
	
	Clock();
	
	/* 1 millisecond delay for the Multiplexer to settle */
	delay(1);
	Clock();
	
	value = 0;
	digitalWrite(ADCDIN, HIGH);
	
  	// Make the data pin an input to microcontroller now

  	pinMode(ADCDOUT, INPUT);

	/* Clock out the 8-bit data from A/D converter */
	for( i=0; i<8; i++ )
	{
		state = digitalRead(ADCDOUT);
		
		if( state ) value |= 1;		
		
		Clock();
		
		if( i < 7 ) value = value << 1;		
	}
	
	// 8 dummy clocks

	for( i=0; i<8; i++ )
		Clock();
	
	return value;
}
 
void Clock()
{
	digitalWrite(ADCCLK, HIGH);
	digitalWrite(ADCCLK, HIGH);			/* A little delay */
	digitalWrite(ADCCLK, LOW);
}