Sylvester Demmel
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
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Seeed_Grove_Temp_Humidity_Example
by 
Seeed
Diff: main.cpp
- Revision:
- 0:c12c28a0f9e7
- Child:
- 2:17efe72364ea
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Aug 15 20:59:57 2014 +0000
@@ -0,0 +1,28 @@
+
+#include "mbed.h"
+#include "DHT.h"
+
+DHT sensor(D4, DHT11);
+
+int main()
+{
+ int error = 0;
+ float h = 0.0f, c = 0.0f, f = 0.0f, k = 0.0f, dp = 0.0f, dpf = 0.0f;
+
+ while(1) {
+ wait(2.0f);
+ error = sensor.readData();
+ if (0 == error) {
+ c = sensor.ReadTemperature(CELCIUS);
+ f = sensor.ReadTemperature(FARENHEIT);
+ k = sensor.ReadTemperature(KELVIN);
+ h = sensor.ReadHumidity();
+ dp = sensor.CalcdewPoint(c, h);
+ dpf = sensor.CalcdewPointFast(c, h);
+ printf("Temperature in Kelvin: %4.2f, Celcius: %4.2f, Farenheit %4.2f\n", k, c, f);
+ printf("Humidity is %4.2f, Dewpoint: %4.2f, Dewpoint fast: %4.2f\n", h, dp, dpf);
+ } else {
+ printf("Error: %d\n", error);
+ }
+ }
+}