DHT_mbed.cpp

#include "DHT.h"
#include "mbed.h"
using namespace std;

#define NEED_LIGHT_HOURS 12
#define MINUTE_CYCLE 30

// sensor port
DHT dht(PC_13, DHT22);  // PC13 = D2
AnalogIn in(PA_5);

int lightCounter = 0;  // from the night 0:00
int timeCounter = 0;

void checkDayLight(int light) {
    if (light >= 5000) {  // 天亮
        lightCounter++;

        if (lightCounter >= NEED_LIGHT_HOURS * (60 / MINUTE_CYCLE)) printf("close the ceiling\r\n");
        // cout << "close the ceiling\r\n";

    } else {
        if (lightCounter < NEED_LIGHT_HOURS * (60 / MINUTE_CYCLE)) {
            printf("turn light on\r\n");
            // cout << "turn light on\r\n";
            lightCounter++;
        }
    }
}

void checkDegree(float temp) {
    if (temp < (float)23)
        printf("add up temperature\r\n");
    else if (temp > (float)30)
        printf("lower the temperature\r\n");
}

void checkHumidity(float hum) {
    if (hum < (float)60)
        printf("add some water fog\r\n");
    else if (hum > (float)85)
        printf("make the air dryer\r\n");
}

void resetCounter() {
    timeCounter = 0;
    lightCounter = 0;
}

int main() {
    while (1) {
        // get data
        time_t now = time(0);
        char* dt = ctime(&now);
        printf("---The local date and time is: %s\r\n---", dt);

        float temp, hum;
        temp = dht.ReadTemperature(CELCIUS);
        hum = dht.ReadHumidity();
        dht.readData();
        printf("   temperature = %.2f\r\n   humidity = %.2f\r\n", temp, hum);

        int light;
        light = in.read_u16();
        printf("   light sensitive = %d\r\n", light);

        printf("\r\n");

        // deal with data
        checkDayLight(light);
        checkDegree(temp);
        checkHumidity(hum);

        // timer
        timeCounter++;
        if (timeCounter == (24 * 60 / MINUTE_CYCLE)) {  // 重置時間為 0:00
            resetCounter();
        }
        
        wait(MINUTE_CYCLE * 60);  // sec
//         wait(5);
    }
}