ADS1115 conversion delay (increase loop speed)

Other Hardware Sensors
1

I am using ADS1115's to read sensor data. So far, so good. However, every time I request a value from the ADC, I need to wait for 8 ms conversion delay. I am looking for a shorter read-time but I do not know where to start.
I am using this library;

I think I must use continous mode instead of single-shot mode, but I don't know how to get it working. Any advice?

2

you might try to change the
#define ADS1115_CONVERSIONDELAY ( 8 )
line in the .h file of the library with 7,6 ... and see how low you can go.
I do not know what the datasheet says about minimal delay between reads.
Related question, do you need 16 bits?

3

I changed that, but once I decrease the value, the output is no longer corresponding to the analog signal.
I don't mind waiting for 8 ms, but I do mind if I need to wait for the chip 6 times per loop.
Can you tell me how to put the device in continous mode instead of single shot? I am not familiar with altering libraries yet.

4

Can you post your code?
To see why you wait 6 times ?

5

Voila, I use three ADS1115's on three boards. All have a different address and use two of the four inputs to read a sensor with two outputs. The ads1115 library is stock.

#include <Wire.h>
#include <Adafruit_ADS1015.h>
#include <SPI.h>

Adafruit_ADS1115 boardroll(0x4a);
Adafruit_ADS1115 boardpitch(0x4b);
Adafruit_ADS1115 boardyaw(0x49);

double sensor1;
double sensor2;
double sensor3;	

//Gyro related
int result;
int result2;
int GyROLL;
int GyPITCH;
int GyYAW;

 int16_t adcroll_1, adcroll_2;
 int16_t adcpitch_1, adcpitch_2;
 int16_t adcyaw_1, adcyaw_2;

void setup(void) 
{
  
  Wire.begin();
  Serial.begin(19200);
  SPI.begin();

  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  
  digitalWrite(8,HIGH);
  digitalWrite(9,HIGH);
  digitalWrite(10,HIGH);
  
  SPI.setBitOrder(MSBFIRST);
  SPI.setClockDivider(SPI_CLOCK_DIV2);
  SPI.setDataMode(SPI_MODE0);

  boardroll.setGain(GAIN_TWOTHIRDS);
  boardpitch.setGain(GAIN_TWOTHIRDS);
  boardyaw.setGain(GAIN_TWOTHIRDS); 

  boardroll.begin();
  boardpitch.begin();
  boardyaw.begin();
  
}

void loop(void) 
{
 
 adcroll_1 = boardroll.readADC_SingleEnded(1);
 adcroll_2 = boardroll.readADC_SingleEnded(2);
 adcpitch_1 = boardpitch.readADC_SingleEnded(1);
 adcpitch_2 = boardpitch.readADC_SingleEnded(2);
 adcyaw_1 = boardyaw.readADC_SingleEnded(1);
 adcyaw_2 = boardyaw.readADC_SingleEnded(2);


  digitalWrite(10, LOW);
  result = SPI.transfer(0x20);
  result = result << 8 | SPI.transfer(0x00);
  result2 = SPI.transfer(0x00) >>2;
  SPI.transfer(0x00);
  GyROLL = result << 6 | result2;
  digitalWrite(10, HIGH); 

  digitalWrite(8, LOW);
  result = SPI.transfer(0x20);
  result = result << 8 | SPI.transfer(0x00);
  result2 = SPI.transfer(0x00) >>2;
  SPI.transfer(0x00);
  GyPITCH = result << 6 | result2;
  digitalWrite(8, HIGH); 
  
  digitalWrite(9, LOW);
  result = SPI.transfer(0x20);
  result = result << 8 | SPI.transfer(0x00);
  result2 = SPI.transfer(0x00) >>2;
  SPI.transfer(0x00);
  GyYAW = result << 6 | result2;
  digitalWrite(9, HIGH); 
  
  

Serial.print(adcyaw_1);
Serial.print(','); 
Serial.print(adcpitch_2);
Serial.print(','); 

Serial.print(adcyaw_2);
Serial.print(',');  
Serial.print(adcroll_2);
Serial.print(','); 

Serial.print(adcroll_1);
Serial.print(',');
Serial.print(adcpitch_1);
Serial.print(',');

Serial.print(GyROLL);
Serial.print(',');
Serial.print(GyPITCH);
Serial.print(',');
Serial.print(GyYAW);
Serial.println();
   
}