求助！checksum error dht11 在线等！【新人贴】
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！！！！double Fahrenheit(double celsius)
{
return 1.8 * celsius + 32;
} //摄氏温度度转化为华氏温度
double Kelvin(double celsius)
{
return celsius + 273.15;
} //摄氏温度转化为开氏温度
// 露点（点在此温度时，空气饱和并产生露珠）
double dewPoint(double celsius, double humidity)
{
double A0= 373.15/(273.15 + celsius);
double SUM = -7.90298 * (A0-1);
SUM += 5.02808 * log10(A0);
SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
SUM += log10(1013.246);
double VP = pow(10, SUM-3) * humidity;
double T = log(VP/0.61078); // temp var
return (241.88 * T) / (17.558-T);
}
// 快速计算露点，速度是5倍dewPoint()
(double celsius, double humidity)
{
double a = 17.271;
double b = 237.7;
double temp = (a * celsius) / (b + celsius) + log(humidity/100);
double Td = (b * temp) / (a - temp);
return Td;
}
#include <Timers.h>
#include <dht11.h>
dht11 DHT11;
#define DHT11PIN 2
int sensor = 9;
int ledPin = 13;
void setup() {
Serial.begin(9600);
pinMode(sensor,INPUT);
pinMode(ledPin,OUTPUT);
TCs.AddFunc(0, DHT11PIN2, 1000);//定义一个任务，1000毫秒执行一次
TCs.AddFunc(1, SENSOR9, 1);//定义一个任务，1毫秒执行一次
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
void DHT11PIN2()
{
Serial.println("\n");
int chk = DHT11.read(DHT11PIN);
Serial.print("Read sensor: ");
switch (chk)
{
case DHTLIB_OK:
Serial.println("OK");
break;
case DHTLIB_ERROR_CHECKSUM:
Serial.println("Checksum error");
break;
case DHTLIB_ERROR_TIMEOUT:
Serial.println("Time out error");
break;
default:
Serial.println("Unknown error");
break;
}
Serial.print("Humidity (%): ");
Serial.println((float)DHT11.humidity, 2);
Serial.print("Temperature (oC): ");
Serial.println((float)DHT11.temperature, 2);
Serial.print("Temperature (oF): ");
Serial.println(Fahrenheit(DHT11.temperature), 2);
Serial.print("Temperature (K): ");
Serial.println(Kelvin(DHT11.temperature), 2);
Serial.print("Dew Point (oC): ");
Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));
Serial.print("Dew PointFast (oC): ");
Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));
}
void SENSOR9()
{
int val=digitalRead(sensor); //定义参数存储人体红外传感器读到的状态
if(HIGH == val) //如果检测到有动物运动（在检测范围内），LED亮
{
digitalWrite(ledPin,HIGH);
delay(5000);
}
else
{
digitalWrite(ledPin,LOW);
}
}
好吧，用taskscheduler做出来了。:) lz,也遇到同样问题，求分享怎么解决的
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