osd-contiki/examples/osd/arduino-wateralert/sketch.pde

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/*
* Sample arduino sketch using contiki features.
* We turn the LED off
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* We allow read the moisture sensor
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* Unfortunately sleeping for long times in loop() isn't currently
* possible, something turns off the CPU (including PWM outputs) if a
* Proto-Thread is taking too long. We need to find out how to sleep in
* a Contiki-compatible way.
* Note that for a normal arduino sketch you won't have to include any
* of the contiki-specific files here, the sketch should just work.
*/
extern "C" {
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#include "rest-engine.h"
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extern volatile uint8_t mcusleepcycle; // default 16
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extern resource_t res_moisture, res_battery;
uint8_t moisture_pin = A5;
uint16_t moisture_voltage = 0;
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#define BUZZER_PIN 3 /* sig pin of the buzzer */
#define LED_PIN 4 /* LED Pin */
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}
void setup (void)
{
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// switch off the led
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pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, HIGH);
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// setup Buzzer
pinMode(BUZZER_PIN, OUTPUT);
digitalWrite(BUZZER_PIN, LOW);
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// init coap resourcen
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rest_init_engine ();
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rest_activate_resource (&res_moisture, "s/moisture");
rest_activate_resource (&res_battery, "s/battery");
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}
void loop (void)
{
mcusleepcycle=0; // dont sleep
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moisture_voltage = analogRead(moisture_pin);
if(moisture_voltage < 800){
digitalWrite(BUZZER_PIN, LOW);
}else{
digitalWrite(BUZZER_PIN, HIGH);
}
mcusleepcycle=32; // sleep, wakeup every 32 cycles
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}