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发表于 2013-5-26 20:55:15
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本帖最后由 philhoo 于 2013-5-26 21:05 编辑
我也做了实验，并且改了程序，没有明白弘毅大师为什么要转换温度，一个位一个位的显示？用这个程序和弘老师的程序比较了一下温度也没有太大的差别。我还以为1602不能显示变量的值，非要转换后显示10位，显示个位，显示小数点这样的。
- /*
- LiquidCrystal Library - Hello World
-
- Demonstrates the use a 16x2 LCD display. The LiquidCrystal
- library works with all LCD displays that are compatible with the
- Hitachi HD44780 driver. There are many of them out there, and you
- can usually tell them by the 16-pin interface.
-
- This sketch prints "Hello World!" to the LCD
- and shows the time.
-
- The circuit:
- * 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)
-
- Library originally added 18 Apr 2008
- by David A. Mellis
- library modified 5 Jul 2009
- by Limor Fried (http://www.ladyada.net)
- example added 9 Jul 2009
- by Tom Igoe
- modified 22 Nov 2010
- by Tom Igoe
-
- This example code is in the public domain.
- http://www.arduino.cc/en/Tutorial/LiquidCrystal
- */
- // include the library code:
- #include <LiquidCrystal.h>
- // initialize the library with the numbers of the interface pins
- LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
- int potPin = 4; //设置模拟口4为LM35的信号输入端
- float temperature = 0; //设置temperature为浮点变量
- long val=0;
- void setup() {
- // set up the LCD's number of columns and rows:
- lcd.begin(16, 2);
- }
- void loop() {
- val = analogRead(potPin); //val变量为从LM35信号口读取到的数
- temperature = (val*0.0048828125*100); //把读取到的val转换为温度数值的10倍
- lcd.clear(); //清屏
- lcd.print("Now Temp is"); //使屏幕显示文字
- lcd.setCursor(0, 1) ; //设置光标位置为第二行第一个位置
- lcd.print(temperature); //显示温度
- lcd.print((char)223); //显示o符号
- lcd.print("C"); //显示字母C
- delay(1000);
- }
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