Código para Salvar dados do Ds18b20 no cartaoSD
#include <SPI.h>
#include <SD.h>
#include <DallasTemperature.h>
#include <OneWire.h>
const int chipSelect = 4;
int t = 0;
OneWire pino(3);
DallasTemperature barramento(&pino);
DeviceAddress sensor;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
barramento.begin();
barramento.getAddress(sensor, 0);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("Initializing SD card...");
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
while (1);
}
Serial.println("card initialized.");
}
void loop()
{
barramento.requestTemperatures();
float temperatura = barramento.getTempC(sensor);
Serial.print(temperatura);
//Mostra a temperatura medida
Serial.print (" ºC");
// make a string for assembling the data to log:
String dataString = "";
// read three sensors and append to the string:
for (int analogPin = 0; analogPin < 1; analogPin++) {
int sensor = analogRead(analogPin);
dataString += String(sensor);
if (analogPin < 2) {
dataString += ",";
}
}
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open("datalog.txt", FILE_WRITE);
// if the file is available, write to it:
if (dataFile) {
Serial.print("tempo: ");
Serial.print(t);
Serial.print(" Temperatura: ");
t=t+8;
dataFile.println(temperatura);
dataFile.println(t);
dataFile.close();
// print to the serial port too:
Serial.println(temperatura);
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
}
delay(480000);
}