Shigenori Inoue / Mbed 2 deprecated AM2303_Hello_World

An example to use an AM2303 （a.k.a. DHT22) humidity sensor

Dependencies:   AM2303 TextLCD mbed

main.cpp@0:a1cd181526fc, 2014-10-13 (annotated)

Committer:
s_inoue_mbed
Date:
Mon Oct 13 14:24:24 2014 +0000
Revision:
0:a1cd181526fc
An example program to use an AM2303 humidity sensor.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
s_inoue_mbed 0:a1cd181526fc 1 /* Copyright (c) 2014 Shigenori Inoue, MIT License
s_inoue_mbed 0:a1cd181526fc 2 *
s_inoue_mbed 0:a1cd181526fc 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
s_inoue_mbed 0:a1cd181526fc 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
s_inoue_mbed 0:a1cd181526fc 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
s_inoue_mbed 0:a1cd181526fc 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
s_inoue_mbed 0:a1cd181526fc 7 * furnished to do so, subject to the following conditions:
s_inoue_mbed 0:a1cd181526fc 8 *
s_inoue_mbed 0:a1cd181526fc 9 * The above copyright notice and this permission notice shall be included in all copies or
s_inoue_mbed 0:a1cd181526fc 10 * substantial portions of the Software.
s_inoue_mbed 0:a1cd181526fc 11 *
s_inoue_mbed 0:a1cd181526fc 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
s_inoue_mbed 0:a1cd181526fc 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
s_inoue_mbed 0:a1cd181526fc 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
s_inoue_mbed 0:a1cd181526fc 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
s_inoue_mbed 0:a1cd181526fc 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
s_inoue_mbed 0:a1cd181526fc 17 */
s_inoue_mbed 0:a1cd181526fc 18
s_inoue_mbed 0:a1cd181526fc 19 #include "mbed.h"
s_inoue_mbed 0:a1cd181526fc 20 #include "TextLCD.h"
s_inoue_mbed 0:a1cd181526fc 21 #include "AM2303.h"
s_inoue_mbed 0:a1cd181526fc 22
s_inoue_mbed 0:a1cd181526fc 23 /* LEDs for debugging */
s_inoue_mbed 0:a1cd181526fc 24 BusOut leds(LED4, LED3, LED2, LED1);
s_inoue_mbed 0:a1cd181526fc 25
s_inoue_mbed 0:a1cd181526fc 26 /* LCD module */
s_inoue_mbed 0:a1cd181526fc 27 TextLCD lcd(p25, p24, p12, p13, p14, p23);
s_inoue_mbed 0:a1cd181526fc 28
s_inoue_mbed 0:a1cd181526fc 29 /* Humidity sensor */
s_inoue_mbed 0:a1cd181526fc 30 AM2303 h(p18);
s_inoue_mbed 0:a1cd181526fc 31
s_inoue_mbed 0:a1cd181526fc 32 /* The main function */
s_inoue_mbed 0:a1cd181526fc 33 int main()
s_inoue_mbed 0:a1cd181526fc 34 {
s_inoue_mbed 0:a1cd181526fc 35 /* Variables */
s_inoue_mbed 0:a1cd181526fc 36 int state;
s_inoue_mbed 0:a1cd181526fc 37
s_inoue_mbed 0:a1cd181526fc 38 /* Show splash screen */
s_inoue_mbed 0:a1cd181526fc 39 lcd.cls();
s_inoue_mbed 0:a1cd181526fc 40 lcd.locate(0, 0);
s_inoue_mbed 0:a1cd181526fc 41 lcd.printf("AM2303 Humidity");
s_inoue_mbed 0:a1cd181526fc 42
s_inoue_mbed 0:a1cd181526fc 43 /* Infinate loop */
s_inoue_mbed 0:a1cd181526fc 44 while(true) {
s_inoue_mbed 0:a1cd181526fc 45 /* Wait for measurement */
s_inoue_mbed 0:a1cd181526fc 46 wait(2.0);
s_inoue_mbed 0:a1cd181526fc 47
s_inoue_mbed 0:a1cd181526fc 48 /* Read the measured results */
s_inoue_mbed 0:a1cd181526fc 49 state = h.readData();
s_inoue_mbed 0:a1cd181526fc 50
s_inoue_mbed 0:a1cd181526fc 51 /* Show the data, otherwise error */
s_inoue_mbed 0:a1cd181526fc 52 lcd.locate(0, 1);
s_inoue_mbed 0:a1cd181526fc 53 if (state != AM2303::OK) {
s_inoue_mbed 0:a1cd181526fc 54 lcd.printf("<Error: %d>", state);
s_inoue_mbed 0:a1cd181526fc 55 } else {
s_inoue_mbed 0:a1cd181526fc 56 lcd.printf("T:%2.1fC, H:%2.1f%%", h.readTemperature(), h.readHumidity());
s_inoue_mbed 0:a1cd181526fc 57 }
s_inoue_mbed 0:a1cd181526fc 58
s_inoue_mbed 0:a1cd181526fc 59 /* Blink LED for Debug */
s_inoue_mbed 0:a1cd181526fc 60 leds = leds + 1;
s_inoue_mbed 0:a1cd181526fc 61 }
s_inoue_mbed 0:a1cd181526fc 62 }