85 lines
3.3 KiB
Arduino
85 lines
3.3 KiB
Arduino
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#include <Wire.h>
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#include "Adafruit_ADS1015.h"
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#include <SPI.h>
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#include <SD.h>
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File myFile;
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Adafruit_ADS1115 ads(0x48); /* Use this for the 16-bit version */
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//Adafruit_ADS1015 ads; /* Use thi for the 12-bit version */
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int GAIN[6] = {GAIN_TWOTHIRDS, GAIN_ONE, GAIN_TWO, GAIN_FOUR, GAIN_EIGHT, GAIN_SIXTEEN};
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float factor[6] = { 3, 2, 1, 0.5, 0.25, 0.125};
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void setup(void)
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{
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Serial.begin(9600);
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Serial.print("Initializing SD card...");
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// On the Ethernet Shield, CS is pin 4. It's set as an output by default.
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// Note that even if it's not used as the CS pin, the hardware SS pin
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// (10 on most Arduino boards, 53 on the Mega) must be left as an output
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// or the SD library functions will not work.
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pinMode(MOSI, OUTPUT);
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pinMode(SCK, OUTPUT);
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if (!SD.begin(11)) {
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Serial.println("initialization failed!");
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return;
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}
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Serial.println("initialization done.");
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// delete the file:
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Serial.println("Removing example.txt...");
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SD.remove("example.txt");
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if (SD.exists("example.txt")) {
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Serial.println("example.txt exists.");
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}
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else {
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Serial.println("example.txt doesn't exist.");
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}
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// open a new file and immediately close it:
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Serial.println("Creating example.txt...");
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myFile = SD.open("example.txt", FILE_WRITE);
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myFile.close();
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// The ADC input range (or gain) can be changed via the following
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// functions, but be careful never to exceed VDD +0.3V max, or to
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// exceed the upper and lower limits if you adjust the input range!
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// Setting these values incorrectly may destroy your ADC!
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// ADS1015 ADS1115
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// ------- -------
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//ads.setGain(GAIN_TWOTHIRDS); // 2/3x gain +/- 6.144V 1 bit = 3mV 0.1875mV (default)
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// ads.setGain(GAIN_ONE); // 1x gain +/- 4.096V 1 bit = 2mV 0.125mV
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ads.setGain(GAIN_TWO); // 2x gain +/- 2.048V 1 bit = 1mV 0.0625mV
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// ads.setGain(GAIN_FOUR); // 4x gain +/- 1.024V 1 bit = 0.5mV 0.03125mV
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// ads.setGain(GAIN_EIGHT); // 8x gain +/- 0.512V 1 bit = 0.25mV 0.015625mV
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// ads.setGain(GAIN_SIXTEEN); // 16x gain +/- 0.256V 1 bit = 0.125mV 0.0078125mV
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ads.begin();
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}
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int16_t adc0, adc1, adc2, adc3;
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void loop(void)
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{
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myFile = SD.open("example.txt", FILE_WRITE);
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if (myFile) {
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adc0 = ads.readADC_SingleEnded(2);
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adc1 = ads.readADC_SingleEnded(3);
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Serial.print("AN2: "); Serial.print(adc0*0.0625); Serial.println("mV"); //Serial.print(((float)(adc0*0.0625 - 200.56)/(344))*1000. ); Serial.println("ppb");
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Serial.print("AN3: "); Serial.print(adc1*0.0625); Serial.println("mV"); //Serial.print(((float)(adc0*0.0625 - 200.56)/(344))*1000. ); Serial.println("ppb");
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myFile.print(adc0*0.0625);
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myFile.print(" ");
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myFile.println(adc1*0.0625);
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// Serial.print("CO: "); Serial.print(adc0*0.5); Serial.print("mV, "); Serial.print((float)(430 - adc0*0.5)*0.473); Serial.println("ppb");
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// Serial.print("NO2: "); Serial.print(adc1*0.5); Serial.print("mV, "); Serial.print((float)(adc1*0.5 - 273)*0.278 ); Serial.println("ppb");
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// Serial.print("AIN2: "); Serial.println(adc2);
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// Serial.print("AIN3: "); Serial.println(adc3);
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delay(1000);
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myFile.close();
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}
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}
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