File content as of revision 0:941787ae3c86:

#include "mbed.h"
AnalogIn waterSensor(p20);
AnalogIn moistureSensor(p19);
AnalogIn lightSensor(p18);
Serial pc(USBTX, USBRX); // tx, rx
PwmOut speaker(p21);
PwmOut led(p22);
PwmOut warningLight(LED1);

int main() {
    pc.printf("\rstart printing\n");
    int counting = 0;
    float water = 0.0;
    float light = 0.0;
    float moist = 0.0;
    speaker.period(1.0/2000.0);

    while(1) {
        water = waterSensor.read();
        moist = moistureSensor.read();
        light = lightSensor.read();
        pc.printf("%d: ",counting);
        pc.printf("%f water\n\r",water);
        pc.printf("%f moist\n\r",moist);
        pc.printf("%f light\n\r",light);
        counting++;
        led.write(1-light);
        
        if (light<0.3){//water>0.4 //mosit<0.3
            speaker = 0.3;
            warningLight.write(.5);
        }
        else 
        {
            speaker = warningLight = 0;            
        }
        wait(1);
    }
}