求助！checksum error dht11 在线等！【新人贴】

yanglz2000

我在使用czad的timers多任务库（http://www.geek-workshop.com/thread-4852-1-1.html）时dht11出现了checksum error,请问为何？在线等！！！！

1. double Fahrenheit(double celsius)
   
2. {
   
3.         return 1.8 * celsius + 32;
   
4. }    //摄氏温度度转化为华氏温度
   
5. 
   
6. double Kelvin(double celsius)
   
7. {
   
8.         return celsius + 273.15;
   
9. }     //摄氏温度转化为开氏温度
   
10. 
    
11. // 露点（点在此温度时，空气饱和并产生露珠）
    
12. double dewPoint(double celsius, double humidity)
    
13. {
    
14.         double A0= 373.15/(273.15 + celsius);
    
15.         double SUM = -7.90298 * (A0-1);
    
16.         SUM += 5.02808 * log10(A0);
    
17.         SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
    
18.         SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
    
19.         SUM += log10(1013.246);
    
20.         double VP = pow(10, SUM-3) * humidity;
    
21.         double T = log(VP/0.61078);   // temp var
    
22.         return (241.88 * T) / (17.558-T);
    
23. }
    
24. 
    
25. // 快速计算露点，速度是5倍dewPoint()
    
26. (double celsius, double humidity)
    
27. {
    
28.         double a = 17.271;
    
29.         double b = 237.7;
    
30.         double temp = (a * celsius) / (b + celsius) + log(humidity/100);
    
31.         double Td = (b * temp) / (a - temp);
    
32.         return Td;
    
33. }
    
34. #include <Timers.h>
    
35. #include <dht11.h>
    
36. dht11 DHT11;
    
37. #define DHT11PIN 2
    
38. int sensor = 9;
    
39. int ledPin = 13;
    
40. void setup() {
    
41.   Serial.begin(9600);
    
42.   pinMode(sensor,INPUT);
    
43.   pinMode(ledPin,OUTPUT);
    
44.    TCs.AddFunc(0, DHT11PIN2, 1000);//定义一个任务，1000毫秒执行一次
    
45.    TCs.AddFunc(1, SENSOR9, 1);//定义一个任务，1毫秒执行一次
    
46.   // put your setup code here, to run once:
    
47. 
    
48. }
    
49. 
    
50. void loop() {
    
51.   // put your main code here, to run repeatedly:
    
52. 
    
53. }
    
54. 
    
55. void DHT11PIN2()
    
56. {
    
57. Serial.println("\n");
    
58. 
    
59.   int chk = DHT11.read(DHT11PIN);
    
60. 
    
61.   Serial.print("Read sensor: ");
    
62.   switch (chk)
    
63.   {
    
64.     case DHTLIB_OK:
    
65.                 Serial.println("OK");
    
66.                 break;
    
67.     case DHTLIB_ERROR_CHECKSUM:
    
68.                 Serial.println("Checksum error");
    
69.                 break;
    
70.     case DHTLIB_ERROR_TIMEOUT:
    
71.                 Serial.println("Time out error");
    
72.                 break;
    
73.     default:
    
74.                 Serial.println("Unknown error");
    
75.                 break;
    
76.   }
    
77. 
    
78.   Serial.print("Humidity (%): ");
    
79.   Serial.println((float)DHT11.humidity, 2);
    
80. 
    
81.   Serial.print("Temperature (oC): ");
    
82.   Serial.println((float)DHT11.temperature, 2);
    
83. 
    
84.   Serial.print("Temperature (oF): ");
    
85.   Serial.println(Fahrenheit(DHT11.temperature), 2);
    
86. 
    
87.   Serial.print("Temperature (K): ");
    
88.   Serial.println(Kelvin(DHT11.temperature), 2);
    
89. 
    
90.   Serial.print("Dew Point (oC): ");
    
91.   Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));
    
92. 
    
93.   Serial.print("Dew PointFast (oC): ");
    
94.   Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));
    
95. }
    
96. 
    
97. void SENSOR9()
    
98. {
    
99. int val=digitalRead(sensor); //定义参数存储人体红外传感器读到的状态
    
100. if(HIGH == val) //如果检测到有动物运动（在检测范围内），LED亮
     
101. {
     
102. digitalWrite(ledPin,HIGH);
     
103. delay(5000);
     
104. }
     
105. else
     
106. {
     
107. digitalWrite(ledPin,LOW);
     
108. }
     
109. }
     

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yanglz2000

好吧，用taskscheduler做出来了。

陌上桑

lz,也遇到同样问题，求分享怎么解决的