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- // DHT Temperature & Humidity Sensor
- // Unified Sensor Library Example
- // Originally Written by Tony DiCola for Adafruit Industries
- // Released under an MIT license.
- // Modified by G.D. Walters for Full Circle Magazine
- // April, 2017
- // Depends on the following Arduino libraries:
- // - Adafruit Unified Sensor Library: https://github.com/adafruit/Adafruit_Sensor
- // - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
- #include <Adafruit_Sensor.h>
- #include <DHT.h>
- #include <DHT_U.h>
- #define DHTPIN 4 // Pin which is connected to the DHT sensor.
- // Uncomment the type of sensor in use:
- //#define DHTTYPE DHT11 // DHT 11
- #define DHTTYPE DHT22 // DHT 22 (AM2302)
- //#define DHTTYPE DHT21 // DHT 21 (AM2301)
- // See guide for details on sensor wiring and usage:
- // https://learn.adafruit.com/dht/overview
- DHT_Unified dht(DHTPIN, DHTTYPE);
- uint32_t delayMS;
- void setup() {
- Serial.begin(9600);
- // Initialize device.
- dht.begin();
- Serial.println("DHTxx Unified Sensor Example");
- // Print temperature sensor details.
- sensor_t sensor;
- dht.temperature().getSensor(&sensor);
- Serial.println("------------------------------------");
- Serial.println("Temperature");
- Serial.print ("Sensor: "); Serial.println(sensor.name);
- Serial.print ("Driver Ver: "); Serial.println(sensor.version);
- Serial.print ("Unique ID: "); Serial.println(sensor.sensor_id);
- Serial.print ("Max Value: "); Serial.print(sensor.max_value); Serial.println(" *C");
- Serial.print ("Min Value: "); Serial.print(sensor.min_value); Serial.println(" *C");
- Serial.print ("Resolution: "); Serial.print(sensor.resolution); Serial.println(" *C");
- Serial.println("------------------------------------");
- // Print humidity sensor details.
- dht.humidity().getSensor(&sensor);
- Serial.println("------------------------------------");
- Serial.println("Humidity");
- Serial.print ("Sensor: "); Serial.println(sensor.name);
- Serial.print ("Driver Ver: "); Serial.println(sensor.version);
- Serial.print ("Unique ID: "); Serial.println(sensor.sensor_id);
- Serial.print ("Max Value: "); Serial.print(sensor.max_value); Serial.println("%");
- Serial.print ("Min Value: "); Serial.print(sensor.min_value); Serial.println("%");
- Serial.print ("Resolution: "); Serial.print(sensor.resolution); Serial.println("%");
- Serial.println("------------------------------------");
- // Set delay between sensor readings based on sensor details.
- delayMS = sensor.min_delay / 1000;
- }
- void loop() {
- handleSerial();
- }
- void handleSerial() {
- while (Serial.available() > 0) {
- char inChar = Serial.read();
- switch (inChar) {
- case 'T':
- case 't':
- // get temp
- sensors_event_t event;
- dht.temperature().getEvent(&event);
- if (isnan(event.temperature)) {
- Serial.println("Error reading temperature!");
- }
- else {
- Serial.print("Temperature: ");
- Serial.print(event.temperature);
- Serial.print(" *C - ");
- Serial.print((event.temperature * 1.8) + 32);
- Serial.println(" *F");
- }
- // Delay between measurements.
- delay(delayMS);
- break;
- case 'H':
- case 'h':
- // get humidity
- dht.humidity().getEvent(&event);
- if (isnan(event.relative_humidity)) {
- Serial.println("Error reading humidity!");
- }
- else {
- Serial.print("Humidity: ");
- Serial.print(event.relative_humidity);
- Serial.println("%");
- }
- // Delay between measurements.
- delay(delayMS);
- break;
- default:
- break;
- }
- }
- }
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