Sylvester Demmel / Mbed 2 deprecated Seeed_Grove_Temp_Humidity_Example

Example for DHT22 / AM2302 DHT11 and similar sensors. Now with value behind decimal point for DHT22 and comment on the calculation for temp and humidity of DHT22

Dependencies:   DHT mbed

Fork of Seeed_Grove_Temp_Humidity_Example by Seeed

main.cpp@2:17efe72364ea, 2017-01-07 (annotated)

Committer:
Sly_fox
Date:
Sat Jan 07 21:59:37 2017 +0000
Revision:
2:17efe72364ea
Parent:
0:c12c28a0f9e7 
Changed to one decimal after deciml point as 1/100 of degrees do not realy make sense with these sensors.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sam_grove 0:c12c28a0f9e7 1
sam_grove 0:c12c28a0f9e7 2 #include "mbed.h"
sam_grove 0:c12c28a0f9e7 3 #include "DHT.h"
sam_grove 0:c12c28a0f9e7 4
Sly_fox 2:17efe72364ea 5 DHT sensor(D7, DHT22);
sam_grove 0:c12c28a0f9e7 6
sam_grove 0:c12c28a0f9e7 7 int main()
sam_grove 0:c12c28a0f9e7 8 {
sam_grove 0:c12c28a0f9e7 9 int error = 0;
sam_grove 0:c12c28a0f9e7 10 float h = 0.0f, c = 0.0f, f = 0.0f, k = 0.0f, dp = 0.0f, dpf = 0.0f;
sam_grove 0:c12c28a0f9e7 11
sam_grove 0:c12c28a0f9e7 12 while(1) {
Sly_fox 2:17efe72364ea 13 wait(2.0f);
sam_grove 0:c12c28a0f9e7 14 error = sensor.readData();
sam_grove 0:c12c28a0f9e7 15 if (0 == error) {
sam_grove 0:c12c28a0f9e7 16 c = sensor.ReadTemperature(CELCIUS);
sam_grove 0:c12c28a0f9e7 17 f = sensor.ReadTemperature(FARENHEIT);
sam_grove 0:c12c28a0f9e7 18 k = sensor.ReadTemperature(KELVIN);
sam_grove 0:c12c28a0f9e7 19 h = sensor.ReadHumidity();
sam_grove 0:c12c28a0f9e7 20 dp = sensor.CalcdewPoint(c, h);
sam_grove 0:c12c28a0f9e7 21 dpf = sensor.CalcdewPointFast(c, h);
Sly_fox 2:17efe72364ea 22 printf("Temperature in Kelvin: %4.1f, Celcius: %4.1f, Farenheit %4.1f\n", k, c, f);
Sly_fox 2:17efe72364ea 23 printf("Humidity is %4.1f, Dewpoint: %4.1f, Dewpoint fast: %4.1f\n", h, dp, dpf);
Sly_fox 2:17efe72364ea 24 printf("\n");
sam_grove 0:c12c28a0f9e7 25 } else {
sam_grove 0:c12c28a0f9e7 26 printf("Error: %d\n", error);
sam_grove 0:c12c28a0f9e7 27 }
sam_grove 0:c12c28a0f9e7 28 }
sam_grove 0:c12c28a0f9e7 29 }