84 lines
2.5 KiB
Plaintext
84 lines
2.5 KiB
Plaintext
/*
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* Sample arduino sketch using contiki features.
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* 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
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* possible, something turns off the CPU (including PWM outputs) if a
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* Proto-Thread is taking too long. We need to find out how to sleep in
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* a Contiki-compatible way.
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* Note that for a normal arduino sketch you won't have to include any
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* of the contiki-specific files here, the sketch should just work.
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*/
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#include <Wire.h>
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#include "DHT.h"
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extern "C" {
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#include "arduino-process.h"
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#include "rest-engine.h"
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extern resource_t res_htu21dtemp, res_htu21dhum, res_battery;
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#define LED_PIN 4
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// Uncomment whatever type you're using!
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//#define DHTTYPE DHT11 // DHT 11
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#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
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//#define DHTTYPE DHT21 // DHT 21 (AM2301)
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// Connect pin 1 (on the left) of the sensor to +3.3V
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// Connect pin 2 of the sensor to whatever your DHTPIN is
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// Connect pin 4 (on the right) of the sensor to GROUND
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// Connect a 10K resistor from pin 2 (data) to pin 1 (power) o
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#define DHTPIN 9 // what digital pin we're connected to
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DHT dht(DHTPIN, DHTTYPE);
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float dht_hum;
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float dht_temp;
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char dht_hum_s[8];
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char dht_temp_s[8];
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}
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void setup (void)
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{
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printf("DHT Sensor\n");
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// switch off the led
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pinMode(LED_PIN, OUTPUT);
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digitalWrite(LED_PIN, HIGH);
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// DHT sensor
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dht.begin();
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// init coap resourcen
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rest_init_engine ();
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#pragma GCC diagnostic ignored "-Wwrite-strings"
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rest_activate_resource (&res_htu21dtemp, "s/temp");
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rest_activate_resource (&res_htu21dhum, "s/hum");
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rest_activate_resource (&res_battery, "s/battery");
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#pragma GCC diagnostic pop
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mcu_sleep_set(128); // Power consumtion 278uA; average over 20 minutes
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}
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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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{
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// Reading temperature or humidity takes about 250 milliseconds!
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// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
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dht_hum = dht.readHumidity();
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// Read temperature as Celsius (the default)
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dht_temp = dht.readTemperature();
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// Check if any reads failed and exit early (to try again).
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if (isnan(dht_hum) || isnan(dht_temp)) {
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printf("Failed to read from DHT sensor!\n");
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return;
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}
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dtostrf(dht_temp , 0, 2, dht_temp_s );
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dtostrf(dht_hum , 0, 2, dht_hum_s );
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// debug only
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printf("Temp: '%s'",dht_temp_s);
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printf("\t\tHum: '%s'\n",dht_hum_s);
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}
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