Arduino 8：溫度量測，來個LCD顯示

DS18B20

需要引入函式庫

1. #include <OneWire.h>
2. 
   
3. int DS18S20_Pin = 2; //DS18S20 Signal pin on digital 2
4. 
   
5. //Temperature chip i/o
6. OneWire ds(DS18S20_Pin);  // on digital pin 2
7. 
   
8. void setup(void) {
9.   Serial.begin(9600);     //從螢幕上監測
10. }
11. 
    
12. void loop(void) {
13.   float temperature = getTemp();
14.   Serial.println(temperature);
15.   
16.   delay(100); //just here to slow down the output so it is easier to read
17. }
18. 
    
19. 
    
20. 
    
21. float getTemp(){
22.                             //returns the temperature from one DS18S20 in DEG Celsius
23.   byte data[12];
24.   byte addr[8];
25. 
    
26.   if ( !ds.search(addr)) {
27.       //no more sensors on chain, reset search
28.       ds.reset_search();
29.       return -1000;
30.   }
31. 
    
32.   if ( OneWire::crc8( addr, 7) != addr[7]) {
33.       Serial.println("CRC is not valid!");
34.       return -1000;
35.   }
36. 
    
37.   if ( addr[0] != 0x10 && addr[0] != 0x28) {
38.       Serial.print("Device is not recognized");
39.       return -1000;
40.   }
41. 
    
42.   ds.reset();
43.   ds.select(addr);
44.   ds.write(0x44,1); // start conversion, with parasite power on at the end
45. 
    
46.   byte present = ds.reset();
47.   ds.select(addr);    
48.   ds.write(0xBE); // Read Scratchpad
49. 
    
50.   
51.   for (int i = 0; i < 9; i++) { // we need 9 bytes
52.     data[i] = ds.read();
53.   }
54.   
55.   ds.reset_search();
56.   
57.   byte MSB = data[1];
58.   byte LSB = data[0];
59. 
    
60.   float tempRead = ((MSB << 8) | LSB); //using two's compliment
61.   float TemperatureSum = tempRead / 16;
62.   return TemperatureSum;
63. }

改成將結果輸出到LCD

1. //-------------------------   LCD 
2.                                              //Library version:1.1
3.  #include <OneWire.h>      // DS18S20 waterproof溫度模組
4.  #include <Wire.h>
5.  #include <LiquidCrystal_I2C.h>
6.  #if defined(ARDUINO) && ARDUINO >= 100
7.  #define printByte(args)  write(args);
8.  #else
9.  #define printByte(args)  print(args,BYTE);
10.  #endif
11.  LiquidCrystal_I2C lcd(0x20,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line
12. //-------------------------
13. 
    
14.  int DS18S20_Pin = 2;     //DS18S20 溫度Signal pin on digital 2
15.                                          //Temperature chip i/o
16.  OneWire ds(DS18S20_Pin);  // on digital pin 2
17.  
18. void setup() {
19.     //-------------------------   LCD  
20.      lcd.init();                      // initialize the lcd 
21.      lcd.backlight();
22. 
    
23.      lcd.setCursor(0, 0);
24.      lcd.print   ("Temp.=");
25.     //-------------------------   LCD 
26. }
27. 
    
28. 
    
29. void loop(){       
30.         float temperature = getTemp();
31.                                    //Serial.println(temperature);
32.        //-------------------------   LCD  
33.          lcd.setCursor(6, 0);
34.          lcd.print(temperature, 3  );
35.          lcd.print((char)223);            //度
36.          lcd.print("C");
37.        //-------------------------   LCD 
38.  
39.   delay(100);   //just here to slow down the output so it is easier to read
40.                                 // delay(1000);          // 等待一秒鐘（每隔一秒測量一次）
41. }
42. 
    
43. 
    
44. 
    
45. float getTemp(){
46.                             //returns the temperature from one DS18S20 in DEG Celsius
47.   byte data[12];
48.   byte addr[8];
49.   if ( !ds.search(addr)) {
50.       //no more sensors on chain, reset search
51.       ds.reset_search();
52.       return -1000;
53.   }
54. 
    
55.   if ( OneWire::crc8( addr, 7) != addr[7]) {
56.       Serial.println("CRC is not valid!");
57.       return -1000;
58.   }
59. 
    
60.   if ( addr[0] != 0x10 && addr[0] != 0x28) {
61.       Serial.print("Device is not recognized");
62.       return -1000;
63.   }
64. 
    
65.   ds.reset();
66.   ds.select(addr);
67.   ds.write(0x44,1); // start conversion, with parasite power on at the end
68. 
    
69.   byte present = ds.reset();
70.   ds.select(addr);    
71.   ds.write(0xBE); // Read Scratchpad
72. 
    
73.   
74.   for (int i = 0; i < 9; i++) { // we need 9 bytes
75.     data[i] = ds.read();
76.   }
77.   
78.   ds.reset_search();
79.   
80.   byte MSB = data[1];
81.   byte LSB = data[0];
82. 
    
83.   float tempRead = ((MSB << 8) | LSB); //using two's compliment
84.   float TemperatureSum = tempRead / 16;
85.   return TemperatureSum;
86. }