dth11，1602扩展版，arduino uno温度计简单教程，
1602扩展版温度计 今天又用1602显示屏扩展板+dth11温度计，arduinoUNO做了一个温度计，这个温度计最大的特点是简单，接三根线就行，剩下的就是烧录程序了。 Arduino IDE版本：1.0.6 程序如下。 缺点是，要按，才测量温度，不按不理你。 DTH11，用的是12号中断口。1602显示屏扩展板是一体的，买回来就是这样，但是缺几根针，我去焊了几根针。这个扩展板不好用，没传感器什么的，不推荐各位买。
#include <LiquidCrystal.h>
#include <dht11.h>
#include <Wire.h>
dht11 DHT;
#define DHT11_PIN 12
LiquidCrystal lcd(8, 13, 9, 4, 5, 6, 7);
char msgs = {"Ri",
"Up",
"Do",
"Le",
"Se" };
int adc_key_val ={50, 200, 400, 600, 800};
int NUM_KEYS = 5;
int adc_key_in;
int key=-1;
int oldkey=-1;
void setup() {
//put your setup code here, to run once:
lcd.clear();
lcd.begin(16, 2);
lcd.setCursor(0,0);
lcd.print("% CRQ shcool %");
}
void loop() {
delay (1000);
//put your main code here, to run repeatedly:
adc_key_in = analogRead(0); //read the value from the sensor
key= get_key(adc_key_in);// convert intokey press
if(key != oldkey) // if keypress isdetected
{
delay(50);// wait for debouncetime
adc_key_in = analogRead(0); //read the value from the sensor
key = get_key(adc_key_in); //convert into key press
if (key != oldkey)
{
lcd.setCursor(0, 1);
int chk;//chk用于存储DHT11传感器的数据
Serial.print("DHT11 \t");
//读取DHT11传感器的数据
chk = DHT.read(DHT11_PIN);
switch(chk)
{
caseDHTLIB_OK:
Serial.print("OK,\t");
break;
caseDHTLIB_ERROR_CHECKSUM:
Serial.print("Checksumerror,\t");
break;
caseDHTLIB_ERROR_TIMEOUT:
Serial.print("Time outerror,\t");
break;
Serial.print("Unknown error,\t");
break;
}
//串口显示温湿度值
Serial.print(DHT.humidity,1);
Serial.print("\t");
Serial.println(DHT.temperature,1);
oldkey = key;
if (key >=0){
lcd.print("H");
lcd.print(DHT.humidity,1);
lcd.print("% ");
lcd.print(msgs);
lcd.print(" ");
lcd.print(DHT.temperature,1);
lcd.print("C");
}
}
}
delay(100);
}
// Convert ADC value to key number
int get_key(unsigned int input)
{
int k;
for (k = 0; k < NUM_KEYS; k++)
{
if (input < adc_key_val)
{
return k;
}
}
if (k >= NUM_KEYS)k = -1;//No valid key pressed
return k;
}
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