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ESP32 C3 Super Mini with DHT11

Introduction

This project demonstrates how to use the ESP32 C3 Super Mini microcontroller with a DHT11 sensor to measure temperature and humidity. The data will be displayed via the Serial Monitor in the Arduino IDE.

Schematic

Below is the schematic for connecting the ESP32 C3 Super Mini to the DHT11 sensor.

Schematic

Components

  • ESP32 C3 Super Mini
  • DHT11 Temperature and Humidity Sensor
  • Jumper Wires
  • Breadboard
  • 10K Resistor

Code Explanation

The provided code reads the temperature and humidity data from the DHT11 sensor and prints it to the Serial Monitor. It also calculates the heat index, which is a measure of how hot it feels when relative humidity is factored in with the actual air temperature.

#include "DHT.h"

#define DHTPIN 10     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11 // DHT 11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  dht.begin();
}

void loop() {
  delay(2000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  float hif = dht.computeHeatIndex(f, h);
  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.println(F("°F"));
}

Instructions

  1. Set Up:

  2. Upload Code:

    • Open the Arduino IDE.
    • Copy the provided code into the Arduino IDE.
    • Select the appropriate board and port in the Arduino IDE.
    • Upload the code to the ESP32 C3 Super Mini.

  3. View Results:

    • Open the Serial Monitor in the Arduino IDE.
    • Set the baud rate to 9600.
    • Observe the temperature and humidity readings along with the calculated heat index.

Result

Once the code is uploaded and the ESP32 C3 is running, the Serial Monitor will display the temperature, humidity, and heat index values.

Result

Hardware

Additional Notes

  • Ensure that the DHT11 sensor is properly connected and powered.
  • If using a 3.3V logic board, connect the sensor's VCC pin to 3.3V instead of 5V.
  • Use a 10K resistor between the data pin and VCC for stable readings.

Resources