器材：arduino uno + 舵机 + dht11 + 杜邦线 + usb + 面包板
第一步：dht11测量 温湿度
贴代码：
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） // 参考: http://wahiduddin.net/calc/density_algorithms.htm 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() // 参考: http://en.wikipedia.org/wiki/Dew_point double dewPointFast(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 <dht11.h> dht11 DHT11; #define DHT11PIN 2 void setup() { Serial.begin(9600); Serial.println("DHT11 TEST PROGRAM "); Serial.print("LIBRARY VERSION: "); Serial.println(DHT11LIB_VERSION); Serial.println(); } void loop() { /*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.print((float)DHT11.temperature, 2); Serial.println((float)DHT11.humidity, 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));*/ delay(2000); }
注明代码出处：http://www.arduino.cn/thread-1429-1-2.html
第二步：可以通过ArduBlock可视化编程
自己改过后的代码：
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） // 参考: http://wahiduddin.net/calc/density_algorithms.htm 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() // 参考: http://en.wikipedia.org/wiki/Dew_point double dewPointFast(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 <Servo.h> #include <dht11.h> dht11 DHT11; #define DHT11PIN 2 Servo servo_pin_3; void setup() { Serial.begin(9600); Serial.println("DHT11 TEST PROGRAM "); Serial.print("LIBRARY VERSION: "); Serial.println(DHT11LIB_VERSION); Serial.println(); servo_pin_3.attach(3); } void loop() { static int a=0; int chk = DHT11.read(DHT11PIN); Serial.println((float)DHT11.temperature, 2); Serial.println((float)DHT11.humidity, 2); if((float)DHT11.temperature>18) { servo_pin_3.write( a ); a+=20; } delay(1000); }
这是我改过之后的代码可以在串口监视器看到温湿度让后用温度大于18度让舵机运动。
转载注明出处。
