69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
/**
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* DHT11 Sensor Reader for Arduino
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* This sketch reads temperature and humidity data from the DHT11 sensor and prints the values to the serial port.
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* It also handles potential error states that might occur during reading.
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*
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* Author: Dhruba Saha
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* Version: 2.0.0
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* License: MIT
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*/
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// Include the DHT11 library for interfacing with the sensor.
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#include <DHT11.h>
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// Create an instance of the DHT11 class.
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// - For Arduino: Connect the sensor to Digital I/O Pin 2.
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// - For ESP32: Connect the sensor to pin GPIO2 or P2.
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// - For ESP8266: Connect the sensor to GPIO2 or D4.
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DHT11 dht11(2);
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void setup()
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{
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// Initialize serial communication to allow debugging and data readout.
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// Using a baud rate of 9600 bps.
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Serial.begin(9600);
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}
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void loop()
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{
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// Attempt to read the temperature and humidity values from the DHT11 sensor.
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int temperature = dht11.readTemperature();
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// If using ESP32 or ESP8266 (xtensa architecture), uncomment the delay below.
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// This ensures stable readings when calling methods consecutively.
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// delay(50);
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int humidity = dht11.readHumidity();
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// Check the results of the readings.
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// If there are no errors, print the temperature and humidity values.
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// If there are errors, print the appropriate error messages.
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if (temperature != DHT11::ERROR_CHECKSUM && temperature != DHT11::ERROR_TIMEOUT &&
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humidity != DHT11::ERROR_CHECKSUM && humidity != DHT11::ERROR_TIMEOUT)
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{
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Serial.print("Temperature: ");
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Serial.print(temperature);
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Serial.println(" °C");
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Serial.print("Humidity: ");
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Serial.print(humidity);
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Serial.println(" %");
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}
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else
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{
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if (temperature == DHT11::ERROR_TIMEOUT || temperature == DHT11::ERROR_CHECKSUM)
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{
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Serial.print("Temperature Reading Error: ");
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Serial.println(DHT11::getErrorString(temperature));
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}
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if (humidity == DHT11::ERROR_TIMEOUT || humidity == DHT11::ERROR_CHECKSUM)
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{
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Serial.print("Humidity Reading Error: ");
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Serial.println(DHT11::getErrorString(humidity));
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}
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}
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// Wait for 1 seconds before the next reading.
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delay(1000);
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}
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