Arduino drive lcd1602a

Demo_01、 Display temperature and humidity data

Be careful ： According to my code annotation Make wiring , If you still don't understand, check lcd Of User manual , There is a detailed circuit diagram ！

#include <LiquidCrystal.h>//LCD The header file 
#include <dht11.h>// Import dht11 The header file 

#define DhtPIN 2 //dht11 Controlled port 
#define RS 6 //LCD1602 Of RS port 
							//RW、VSS、K Pick up GND,VDD、A Pick up VCC
#define E 7 //LCD1602 Of E port 
#define D_Four 9 //LCD1602 Of D4 port 
#define D_Five 10 //LCD1602 Of D5 port 
#define D_six 11 //LCD1602 Of D6 port 
#define D_Seven 12 //LCD1602 Of D7 port 
	
LiquidCrystal lcd(RS,E,D_Four,D_Five,D_six,D_Seven);

void setup() {
    
  lcd.begin(16,2);        // Set up LCD by 2 That's ok 16 Column 
  Serial.begin(9600);
}

void loop() {
    
  dht11 DHT11;
  int chk = DHT11.read(DhtPIN);             // Read sensor data 
  Serial.print("chk = ");                   // Serial port print results , Easy to observe and debug 
  Serial.println(chk);                      // Serial port print results , Easy to observe and debug 
  lcd.setCursor(0,0);                       // initialization LCD The pointer of 1 Xing di 1 Column （ Subscript to be 0）
  
  lcd.print("Temp:");                       //LCD Show “Temp:” character 
  lcd.print((float)DHT11.temperature,0);    // Display temperature data ,2 Significant digits 
    							
  lcd.print("℃");                          // The back shows “℃” Company   character 
  Serial.print("temp = ");                  // Serial port print results , Easy to observe and debug 
  Serial.println((float)DHT11.temperature); // Serial port print results , Easy to observe and debug 
  
  lcd.setCursor(0,1);                       // initialization LCD The pointer of 2 Xing di 1 Column 
  lcd.print("Hum:");                        //LCD Show “Hum:” character 
  lcd.print((float)DHT11.humidity,0);       // Display humidity data ,2 Significant digits 
  lcd.print("%");                           // The back shows “%” Company   character 
    
  Serial.print("Hum = ");                   // Serial port print results , Easy to observe and debug 
  Serial.println((float)DHT11.humidity);    // Serial port print results , Easy to observe and debug 
  
  delay(2000);
}