Interfacing Arduino Uno with MCP3208 ADC

MCP3208 is a 12-bit 8-channel SAR ADC. MCP3208 is interfaced to Arduino Uno to read ADC input. SD interface of Arduino is used to connect to MCP3208 ADC. Connectivity is shown below:

Below is the code for the above interfacing:

#define DATAOUT 11//MOSI

#define DATAIN  12//MISO

#define SPICLOCK  13//sck

#define CHIPSELECT 10//ss

byte ADC_output_data;

byte ADC_input_data=0;

byte clr;

char spi_transfer(volatile char data)

{

  SPDR = data;                    // Start the transmission

  while (!(SPSR & (1<<SPIF)))     // Wait the end of the transmission

  {

  };

  return SPDR;                    // return the received byte

}

void setup()

{

  Serial.begin(9600);

  pinMode(DATAOUT, OUTPUT);

  pinMode(DATAIN, INPUT);

  pinMode(SPICLOCK,OUTPUT);

  pinMode(CHIPSELECT,OUTPUT);

  digitalWrite(CHIPSELECT,HIGH); //disable device  

  spi_init();

  delay(10);

  digitalWrite(CHIPSELECT,LOW);

  spi_transfer(0x06); 

  delay(10);

  spi_transfer(0x00); 

  delay(10);

}

void loop()

{

  ADC_output_data = read_ADC();

  Serial.print(ADC_output_data,DEC);

  Serial.print('\n');

  delay(500);  

  digitalWrite(CHIPSELECT,HIGH);

  delay(500);

  digitalWrite(CHIPSELECT,LOW);

  delay(10);

  spi_transfer(0x06); 

  delay(10);

  spi_transfer(0x00); 

  delay(10);

}

void spi_init()

{

  // SPCR = 01010000

  //interrupt disabled,spi enabled,msb 1st,controller,clk low when idle,

  //sample on leading edge of clk,system clock/4 rate (fastest)

  SPCR = (1<<SPE)|(1<<MSTR);

  clr=SPSR;

  clr=SPDR;

}

byte read_ADC()

{

  //READ ADC

  int data;

  data = spi_transfer(0xFF); //get data byte

  return data;

}