#include <LiquidCrystal.h>
#include <dht.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); //To lcd (RS,E,D4,D5,D6,D7)
dht DHT;
#define DHT11_PIN 7
//Counter to change positions of pages
int page_counter = 1 ; //To move beetwen pages
//-------Pins-----//
int up = 18; //Up button
int down = 19; //Down button
//---------Storage debounce function-----//
boolean current_up = LOW;
boolean last_up = LOW;
boolean last_down = LOW;
boolean current_down = LOW;
void setup() {
lcd.begin(16, 2);
pinMode(up, INPUT_PULLUP);
pinMode(down, INPUT_PULLUP);
}
void loop()
{
current_up = debounce(last_up, up); //Debounce for Up button
current_down = debounce(last_down, down); //Debounce for Down button
//----Page counter function to move pages----//
//Page Up
pageUP();
//Page Down
pageDOWN();
float chk = DHT.read11(DHT11_PIN);
//------- Switch function to write and show what you want---//
switch (page_counter)
{
case 1:
{ //Design of home page 1
lcd.setCursor(3, 0);
lcd.print("Temperature" );
lcd.setCursor(3, 1);delay(2000);
lcd.print(DHT.temperature);//here is the problem ********
lcd.print((char)223);
lcd.print("C");
}
break;
case 2:
{ //Design of page 2
lcd.setCursor(5, 0);
lcd.print("Humidity");
lcd.setCursor(5, 1);
lcd.print(DHT.humidity); //here is the problem ********
lcd.print("%");
}
break;
case 3:
{ //Design of page 3
lcd.setCursor(1, 0);
lcd.print("You are now on");
lcd.setCursor(4, 1);
lcd.print("Page 3");
}
break;
}//switch end
//delay(2000);
}//loop end
//---- De-bouncing function for all buttons----//
boolean debounce(boolean last, int pin)
{
boolean current = digitalRead(pin);
if (last != current)
{
//delay(5);
current = digitalRead(pin);
}
return current;
}
void pageUP()
{
if (last_up == LOW && current_up == HIGH)
{ //When up button is pressed
lcd.clear(); //When page is changed, lcd clear to print new page
if (page_counter < 3) { //Page counter never higher than 3(total of pages)
page_counter = page_counter + 1; //Page up
}
else {
page_counter = 1;
}
}
last_up = current_up;
}
void pageDOWN()
{
if (last_down == LOW && current_down == HIGH)
{ //When down button is pressed
lcd.clear(); //When page is changed, lcd clear to print new page
if (page_counter > 1) { //Page counter never lower than 1 (total of pages)
page_counter = page_counter - 1; //Page down
}
else {
page_counter = 3;
}
}
last_down = current_down;
}`enter code here`
当我要打印温度和湿度等变化的值时，这些按钮不起作用。我认为这是因为dht22传感器需要延迟。 我只是使用Arduino的初学者，我在互联网上找到了此代码。我在面包板上放置的2个按钮仅在我打印字符串时起作用，但是当我打印循环更改的值时，我会遇到一些问题。