Brendan Kelly
/
mDot_LDR_DHT22_Example
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Fork of
mDot_AnalogIn_LDR_Example
by 
Brendan Kelly
Revision 3:3947bb0a2b4f, committed 2017-08-06
- Comitter:
- kellybs1
- Date:
- Sun Aug 06 04:14:08 2017 +0000
- Parent:
- 2:55d40722ec9d
- Commit message:
- testing dht22 ldr
Changed in this revision
| DHT22.lib | Show annotated file Show diff for this revision Revisions of this file |
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DHT22.lib Sun Aug 06 04:14:08 2017 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/Julepalme/code/DHT22/#7fd3ff04ae95
--- a/main.cpp Sun Aug 06 00:24:22 2017 +0000
+++ b/main.cpp Sun Aug 06 04:14:08 2017 +0000
@@ -8,15 +8,36 @@
*
* This program reads the analog input connected to pin PB_1 (UDK2
* pin A0) and prints the result.
+ * And reads temperature/humidity from a DHT22 sensor and prints
+ * the result
*/
#include "mbed.h"
+#include "DHT22.h"
+
+ DHT22 dht22(PA_1);
int main() {
+ //analogue ldr pin
AnalogIn a0(PB_1);
+
while (true) {
- //read as float (0.0-1.0, multiply by 1000)
+ printf("-----------------------------\r\n");
+ int error = dht22.sample();
+ if (error == 1)
+ {
+ //it's required to divide these values by ten for some reason
+ float h = (float)dht22.getHumidity() / 10;
+ float t = (float)dht22.getTemperature() / 10;
+ printf("TempC: %2.1f, HumidP: %2.1f\r\n", t , h);
+ }
+ else
+ {
+ printf("Error: %d\n", error);
+ }
+
+ //read LDR as float (0.0-1.0, multiply by 1000)
float ldr1 = a0.read() * 1000;
wait_ms(100);
float ldr2 = a0.read() * 1000;
@@ -27,6 +48,6 @@
float ldr = (ldr1 + ldr2 + ldr3) / 3;
//output 3 digits . 3 decimal places
printf("LDR: %3.3f\r\n", ldr);
- wait(1);
+ wait(5);
}
}
\ No newline at end of file