osd-contiki/examples/osd/arduino-htu21/sketch.pde

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/*
* Sample arduino sketch using contiki features.
* We turn the LED off
* We allow read the moisture sensor
* 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.
*/
#include <Wire.h>
#include "Adafruit_HTU21DF.h"
extern "C" {
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#include "arduino-process.h"
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#include "rest-engine.h"
Adafruit_HTU21DF htu = Adafruit_HTU21DF();
extern resource_t res_htu21dtemp, res_htu21dhum, res_battery;
float htu21d_hum;
float htu21d_temp;
char htu21d_hum_s[8];
char htu21d_temp_s[8];
#define LED_PIN 4
}
void setup (void)
{
// switch off the led
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, HIGH);
// htu21d sensor
if (!htu.begin()) {
printf("Couldn't find sensor!");
}
// init coap resourcen
rest_init_engine ();
rest_activate_resource (&res_htu21dtemp, "s/temp");
rest_activate_resource (&res_htu21dhum, "s/hum");
rest_activate_resource (&res_battery, "s/battery");
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mcu_sleep_set(128); // Power consumtion 278uA; average over 20 minutes
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}
// at project-conf.h
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// LOOP_INTERVAL (30 * CLOCK_SECOND)
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void loop (void)
{
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mcu_sleep_off();
htu21d_temp = htu.readTemperature();
htu21d_hum = htu.readHumidity();
mcu_sleep_on();
dtostrf(htu21d_temp , 6, 2, htu21d_temp_s );
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dtostrf(htu21d_hum , 6, 2, htu21d_hum_s );
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// remove space
if(htu21d_temp_s[0]==' '){
memcpy (htu21d_temp_s,htu21d_temp_s+1,strlen(htu21d_temp_s)+1);
}
if(htu21d_hum_s[0]==' '){
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memcpy (htu21d_hum_s,htu21d_hum_s+1,strlen(htu21d_hum_s)+1);
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}
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// debug only
// printf("Temp: %s",htu21d_temp_s);
// printf("\t\tHum: %s\n",htu21d_hum_s);
}