DHT11 on pin 3, readings on an LCD, on an Arduino Uno

// Temperature and humidity: a DHT11 on pin 3, read out on the LCD.
//
//   DHT11 DATA -> pin 3   VCC -> 5V   GND -> GND
//   LCD RS -> pin 4    LCD E -> pin 6
//   LCD D4 -> pin 10   D5 -> pin 11   D6 -> pin 12   D7 -> pin 13
//   LCD RW, VSS, K -> GND     VDD, A -> 5V
//   LCD V0 (contrast) -> GND here; on the bench, the middle leg of a pot
//
// The DHT11 sends its readings down one wire as a string of short and long
// pulses. The DHT library times them. The sensor needs about two seconds
// between readings, so the sketch waits that long.
//
// Click the sensor and change its temperature or humidity.

#include <LiquidCrystal.h>
#include <DHT.h>

DHT dht(3, DHT11);
LiquidCrystal lcd(4, 6, 10, 11, 12, 13);

void setup() {
  dht.begin();
  lcd.begin(16, 2);
  Serial.begin(9600);
  Serial.println("Mokxi Uno: DHT11 on pin 3, LCD on pins 4, 6 and 10 to 13");
}

void loop() {
  delay(2000);
  float humidity = dht.readHumidity();
  float celsius = dht.readTemperature();
  if (isnan(humidity) || isnan(celsius)) {
    lcd.clear();
    lcd.print("Sensor error");
    Serial.println("no reading: check the DATA wire");
    return;
  }
  lcd.setCursor(0, 0);
  lcd.print("Temp:     C     ");
  lcd.setCursor(6, 0);
  lcd.print(celsius, 0);
  lcd.setCursor(0, 1);
  lcd.print("Humidity:  %    ");
  lcd.setCursor(10, 1);
  lcd.print(humidity, 0);
  Serial.print(celsius, 0);
  Serial.print(" C, ");
  Serial.print(humidity, 0);
  Serial.println(" %");
}