Interfacing ADS1244

Projects Networking, Protocols, and Devices
10

better results with pos.Vref = +2.5V
+5V 7FFFFF 8.388.607
+2,5V 40ACA4 ~4.238.500
+0,1V 5DC ~1,500
<+0,1 FFXXXX 16.xxx.xxx

/*
  ADS1244
  
*/

int DATA = 4;
int SCLK = 5;

void setup() {
  
  pinMode(DATA, INPUT);
  pinMode(SCLK, OUTPUT); 
  
  Serial.begin(115200);
  
  // generate a 2.4MHz clock signal on pin 3
  pinMode(3, OUTPUT);      //CLK
  
  // 17.11 Register Description
  TCCR2A = 0x33;  // 0011 0011  
  TCCR2B = 0x09;  // 0000 1001
  OCR2A  = 0x06;  // 0000 0110
  OCR2B  = 0x03;  // 0000 0011
  
  Serial.print("ADS1244");    // output 'AADS1244' (?) additional 'A' in front
  delay(100);
}

void loop() {
  
  // Code for reading the data:
      
  int32_t value = 0;
  
  //digitalWrite(SCLK, HIGH);  //enter slleep mode
  delay(1000);
  digitalWrite(SCLK, LOW);  // wake up ADC
  
      
  // wait for data ready, stay in while-loop until LOW
  while (digitalRead(DATA) == HIGH);     

  value = shiftIn(DATA, SCLK, MSBFIRST);
  value <<= 8;
  value |= shiftIn(DATA, SCLK, MSBFIRST);
  value <<= 8;
  value |= shiftIn(DATA, SCLK, MSBFIRST);

  digitalWrite(SCLK, HIGH);  // enter sleep mode
  //digitalWrite(SCLK, LOW); // 25th pulse to keep DATA high till next data ready
    
  Serial.println(value, DEC);
  Serial.flush();

}