Arduino DHT Sensor
#include "DHT.h" //FOR DHT SENSOR#include <SPI.h> //FOR SD CARD#include <SD.h> //FOR SD CARD#include <OneWire.h>#include <DallasTemperature.h>
const int chipSelect = 4; //Pin to SD card
#define DHTPIN 2 // Digital pin connected to the DHT sensor
// Data wire is plugged into port 7 on the Arduino for water temp probe#define ONE_WIRE_BUS 7// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.DallasTemperature sensors(&oneWire);
// Uncomment whatever type you're using!//#define DHTTYPE DHT11 // DHT 11#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Initialize DHT sensor.
DHT dht(DHTPIN, DHTTYPE);
void setup() { // start serial port Serial.begin(9600);
dht.begin(); Serial.println(F("DHT AM2302 test!")); sensors.begin(); Serial.println("Water Probe Sensor"); 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); }
}
void loop() {
// make a string for assembling the data to log: //String dataString = "";
// Wait a few seconds between measurements. delay(9000); sensors.requestTemperatures(); // Send the command to get temperatures // After we got the temperatures, we can print them here. // We use the function ByIndex, and as an example get the temperature from the first sensor only. float tempC = sensors.getTempCByIndex(0); // Reading temperature or humidity takes about 250 milliseconds! // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) float h = dht.readHumidity(); // Read temperature as Celsius (the default) float t = dht.readTemperature(); // Read temperature as Fahrenheit (isFahrenheit = true) float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { Serial.println(F("Failed to read from DHT sensor!")); return; }
// Compute heat index in Fahrenheit (the default) float hif = dht.computeHeatIndex(f, h); // Compute heat index in Celsius (isFahreheit = false) float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: ")); Serial.print(h); Serial.print(F("% Temperature: ")); Serial.print(t); Serial.print(F("°C ")); Serial.print(f); Serial.print(F("°F Heat index: ")); Serial.print(hic); Serial.print(F("°C ")); Serial.print(hif); Serial.print(F("°F")); Serial.print(F(" Water Temp: ")); Serial.print(tempC); Serial.println(F("°C "));
// 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) { dataFile.print(F("Humidity: ")); dataFile.print (h); dataFile.print(F("% Temperature: ")); dataFile.print(t); dataFile.print(F("°C ")); dataFile.print(f); dataFile.print(F("°F Heat index: ")); dataFile.print(hic); dataFile.print(F("°C ")); dataFile.print(hif); dataFile.print(F("°F")); dataFile.print(F(" Water Temp: ")); dataFile.print(tempC); dataFile.println(F("°C ")); dataFile.close(); // print to the serial port too: //Serial.println(dataString); } // if the file isn't open, pop up an error: else { Serial.println("error opening datalog.txt"); }}
const int chipSelect = 4; //Pin to SD card
#define DHTPIN 2 // Digital pin connected to the DHT sensor
// Data wire is plugged into port 7 on the Arduino for water temp probe#define ONE_WIRE_BUS 7// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.DallasTemperature sensors(&oneWire);
// Uncomment whatever type you're using!//#define DHTTYPE DHT11 // DHT 11#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Initialize DHT sensor.
DHT dht(DHTPIN, DHTTYPE);
void setup() { // start serial port Serial.begin(9600);
dht.begin(); Serial.println(F("DHT AM2302 test!")); sensors.begin(); Serial.println("Water Probe Sensor"); 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); }
}
void loop() {
// make a string for assembling the data to log: //String dataString = "";
// Wait a few seconds between measurements. delay(9000); sensors.requestTemperatures(); // Send the command to get temperatures // After we got the temperatures, we can print them here. // We use the function ByIndex, and as an example get the temperature from the first sensor only. float tempC = sensors.getTempCByIndex(0); // Reading temperature or humidity takes about 250 milliseconds! // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) float h = dht.readHumidity(); // Read temperature as Celsius (the default) float t = dht.readTemperature(); // Read temperature as Fahrenheit (isFahrenheit = true) float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { Serial.println(F("Failed to read from DHT sensor!")); return; }
// Compute heat index in Fahrenheit (the default) float hif = dht.computeHeatIndex(f, h); // Compute heat index in Celsius (isFahreheit = false) float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: ")); Serial.print(h); Serial.print(F("% Temperature: ")); Serial.print(t); Serial.print(F("°C ")); Serial.print(f); Serial.print(F("°F Heat index: ")); Serial.print(hic); Serial.print(F("°C ")); Serial.print(hif); Serial.print(F("°F")); Serial.print(F(" Water Temp: ")); Serial.print(tempC); Serial.println(F("°C "));
// 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) { dataFile.print(F("Humidity: ")); dataFile.print (h); dataFile.print(F("% Temperature: ")); dataFile.print(t); dataFile.print(F("°C ")); dataFile.print(f); dataFile.print(F("°F Heat index: ")); dataFile.print(hic); dataFile.print(F("°C ")); dataFile.print(hif); dataFile.print(F("°F")); dataFile.print(F(" Water Temp: ")); dataFile.print(tempC); dataFile.println(F("°C ")); dataFile.close(); // print to the serial port too: //Serial.println(dataString); } // if the file isn't open, pop up an error: else { Serial.println("error opening datalog.txt"); }}
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