Simplified Dual Channel Read in auto mode (default) p. 14.

README.md

Read 16 bit value using TI ADS8330 via Arduino Due

Based on ADS8319 sketch for reading 16 bit adc value using Arduino Uno. Adapted according to ADS8329/ADS8330 datashhet Simplified Dual Channel Read in auto mode (default) on page 14.

To use wit other Arduinos not having SPI.transfer16 function, please reference ADS8319 sketch for reading 16 bits in two 8 bit reading steps.

ADS8319.ino

// BY: yiipmann
// SOURCE: https://arduino.stackexchange.com/questions/17296/interfacing-ads8319-with-arduino-uno

#include <SPI.h>

#define CONVPIN 7
#define SELPIN 8
#define SELPIN2 4
#define MISOPIN 12
#define SCLKPIN 13

int adcvalue;
byte byte1; byte byte2;
const float aRefVoltage = 5;
float volts = 0;

void setup() {

  // put your setup code here, to run once:
  pinMode(SELPIN, OUTPUT); // ADC's selection pin
  pinMode(SELPIN2, OUTPUT); // 2nd ADC's selection pin
  pinMode(CONVPIN, OUTPUT); // ADC's conversion pin
  pinMode(SCLKPIN, OUTPUT); // ADC's clock pin
  pinMode(MISOPIN, INPUT);  // ADC's data out
  SPI.begin();
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(CONVPIN, LOW);
  digitalWrite(SELPIN, HIGH);
  digitalWrite(SELPIN2, HIGH);
  digitalWrite(CONVPIN, HIGH);
  digitalWrite(SELPIN, LOW);

  delay(1000);

  byte1 = SPI.transfer(0x00); //transfer (read) 8 bits from the adc chip D15-8
  byte2 = SPI.transfer(0x00);  //transfer (read) the second 8 bits. D7-0

  adcvalue = (byte1 <<8) | (byte2 & 0xff);  // combine the 2 bytes to make our 16 bit word
  Serial.print("Voltage Value: ");
  Serial.println(adcvalue,BIN);
  volts = (adcvalue*aRefVoltage/65535);
  Serial.print(" Sensor Volts: ");
  Serial.println(volts,5);
  delay(1000);
}

ADS8330.ino

// Based on: https://arduino.stackexchange.com/questions/17296/interfacing-ads8319-with-arduino-uno
// Modified according to "Figure 6. Simplified Dual Channel Timing" (https://www.ti.com/lit/ds/symlink/ads8330.pdf)

#include <SPI.h>

#define CONVPIN 3 // ADC's conversion pin
#define SELPIN 2 // ADC's selection pin

uint16_t ch0_value, ch1_value;
const float referecnce_voltage = 3.3f;
float ch0_volts, ch1_volts;

void setup() {
  pinMode(SELPIN, OUTPUT);
  pinMode(CONVPIN, OUTPUT);
  
  SPI.begin();
  Serial.begin(9600);
}

void loop() {
  // READ CH0
  digitalWrite(SELPIN, LOW);
  digitalWrite(CONVPIN, LOW);
  ch0_value = SPI.transfer16(0x0000);
  digitalWrite(CONVPIN, HIGH);
  digitalWrite(SELPIN, HIGH);

  // READ CH1
  digitalWrite(SELPIN, LOW);
  digitalWrite(CONVPIN, LOW);
  ch1_value = SPI.transfer16(0x0000);
  digitalWrite(CONVPIN, HIGH);
  digitalWrite(SELPIN, HIGH);
  
  // ---------------------
    
  ch0_volts = ch0_value * referecnce_voltage / UINT16_MAX;
  ch1_volts = ch1_value * referecnce_voltage / UINT16_MAX;
  
  Serial.println(ch0_volts, 5);
  Serial.println(ch1_volts, 5);
  Serial.println();
  
  delay(10);
}