Circuit Documentation

Summary

This circuit involves an ESP32 microcontroller, a DHT11 temperature and humidity sensor, a red LED, and a 220 Ohm resistor. The ESP32 reads temperature data from the DHT11 sensor and controls the LED based on the temperature readings. If the temperature exceeds 30°C, the LED is turned on; otherwise, it remains off.

Component List

ESP32

• Description: A powerful microcontroller with Wi-Fi and Bluetooth capabilities.
• Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT

LED: Two Pin (red)

• Description: A red LED used for visual indication.
• Pins: cathode, anode

DHT11

• Description: A temperature and humidity sensor.
• Pins: DATA, GND, VCC

Resistor

• Description: A 220 Ohm resistor used to limit current through the LED.
• Pins: pin1, pin2
• Properties:
  • Resistance: 220 Ohms

Wiring Details

ESP32

• D26 is connected to pin2 of the Resistor.
• GND is connected to cathode of the LED and GND of the DHT11.
• 3V3 is connected to VCC of the DHT11.
• D4 is connected to DATA of the DHT11.

LED: Two Pin (red)

• cathode is connected to GND of the ESP32.
• anode is connected to pin1 of the Resistor.

DHT11

• GND is connected to GND of the ESP32.
• VCC is connected to 3V3 of the ESP32.
• DATA is connected to D4 of the ESP32.

Resistor

• pin1 is connected to anode of the LED.
• pin2 is connected to D26 of the ESP32.

Code Documentation

ESP32 Code

#include <DHT.h>

#define DHTPIN 4       // DHT22 sensor pin
#define DHTTYPE DHT11  // DHT11 sensor type
#define LEDPIN 26      // LED pin

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(LEDPIN, OUTPUT);
  digitalWrite(LEDPIN, LOW);
  dht.begin();
}

void loop() {
  float temperature = dht.readTemperature();
  if (isnan(temperature)) {
    Serial.println("Error reading temperature!");
    return;
  }

  if (temperature >= 30.0) {
    digitalWrite(LEDPIN, HIGH);
  } else {
    digitalWrite(LEDPIN, LOW);
  }

  delay(1000); // Delay 1 second
}

DHT11 Code

void setup() {
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:
}

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component descriptions, wiring details, and the embedded code for the microcontrollers.