本帖最后由 Alfers 于 2015-1-8 22:29 编辑
连线如图片,测量温湿度,但是LCD只显示第一行的16个方块。程序如下。连线检查过N次无误。 - /*
- * LCD RS pin to digital pin 12
- * LCD Enable pin to digital pin 11
- * LCD D4 pin to digital pin 5
- * LCD D5 pin to digital pin 4
- * LCD D6 pin to digital pin 3
- * LCD D7 pin to digital pin 2
- * LCD R/W pin to ground
- * 10K resistor:
- * ends to +5V and ground
- * wiper to LCD VO pin (pin 3)
- */
- #include <LiquidCrystal.h>
- #include <dht11.h>
- #define DHT11PIN 8
- dht11 DHT11;
- // initialize the library with the numbers of the interface pins
- LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
- void setup() {
- pinMode(DHT11PIN,OUTPUT);
- // set up the LCD's number of columns and rows:
- lcd.begin(16, 2);
- }
- void loop() {
- int chk = DHT11.read(DHT11PIN);
- lcd.setCursor(0, 0);
- lcd.print("Tep: ");
- lcd.print((float)DHT11.temperature, 2);
- lcd.print("C");
- // set the cursor to column 0, line 1
- // (note: line 1 is the second row, since counting begins with 0):
- lcd.setCursor(0, 1);
- // print the number of seconds since reset:
- lcd.print("Hum: ");
- lcd.print((float)DHT11.humidity, 2);
- lcd.print("%");
- delay(200);
- }
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