Arduino Nano 读取ADS1100实例

/*
*  Arduino reads ADS1100  I2C 16bit diff ADC
*/  

/* 
    SDA  ==>  analog 4  PC4
    SCL  ==>  analog 5  PC5

    set register:  STBY   0  0    SC    DR1  DR0 PGA1  PGA0
          default   1     0  0    0      1    1    0     0      0x8C
          i want    1     0  0    0      1    1    0     0
                    ign   0  0   con      8SPS      GAIN 1
    STBY, only for single mode to start conversion
    SC    1= single , 0=continuous 
    DR1:0    datarate 00 = 128sps, 12 bit      -2048 to  2047
                      01 =  32sps, 14          -8192 to  9191
                      10 =  16sps, 15         -16384 to 16383
                      11 =   8sps, 16         -32768 to 32767  
    PGA1:0  Gain      00 = *1, 01 = *2, 10 = *4, 11 = *8  
*/

#include <Wire.h>

//  AD0 1001 000 r/w      AD1 1001 001 r/w ; r=1. w=0     
#define AD0 B1001000         // ADS1100 地址0x48
#define options B10001100    // 0x8C-- 8SPS，16位精度，1倍放大

uint8_t reg = 0;
int16_t result = 0;


void setup() {
  Serial.begin(9600);
  Wire.begin();
  Wire.beginTransmission(AD0);
    Wire.write(options);
  Wire.endTransmission();
}

void loop() {
  Wire.beginTransmission(AD0);
      Wire.requestFrom(AD0, 3);      // 返回 3个 bytes

      while(Wire.available()) {      
        result = Wire.read();     
        result = result << 8;
        result +=  Wire.read();
        reg = Wire.read();
        Serial.print(result, DEC); 
        Serial.println("\t");
        Serial.print((3300.00 * result)/ 0x7FFF, 2);//ADS1100接3.3V电源，如果接5V要将3300.00改为5000.00
        Serial.println(" mV");     
  }
  Wire.endTransmission();
  delay(100);
}