Cayenne-DHT11.ino

/*******************************************************************************
 * Copyright (c) 2015 Thomas Telkamp and Matthijs Kooijman
 *
 * Permission is hereby granted, free of charge, to anyone
 * obtaining a copy of this document and accompanying files,
 * to do whatever they want with them without any restriction,
 * including, but not limited to, copying, modification and redistribution.
 * NO WARRANTY OF ANY KIND IS PROVIDED.
 *
 * This example sends a valid LoRaWAN packet with static payload, 
 * using frequency and encryption settings matching those of
 * the (early prototype version of) The Things Network.
 *
 * Note: LoRaWAN per sub-band duty-cycle limitation is enforced (1% in g1,
 *  0.1% in g2).
 *
 * ToDo:
 * - set NWKSKEY (value from staging.thethingsnetwork.com)
 * - set APPKSKEY (value from staging.thethingsnetwork.com)
 * - set DEVADDR (value from staging.thethingsnetwork.com)
 * - optionally comment #define DEBUG
 * - optionally comment #define SLEEP
 * - set TX_INTERVAL in seconds
 * - change mydata to another (small) static text
 *
 *******************************************************************************/
#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>
#include <DHT.h>
#include <CayenneLPP.h>

#define MAX_SIZE 200 // depends on spreading factor and frequency used

CayenneLPP Payload(MAX_SIZE);

#define DHTPIN            9         // Pin which is connected to the DHT sensor.
#define DHTTYPE           DHT11     // DHT 11 

DHT dht(DHTPIN, DHTTYPE);


// LoRaWAN NwkSKey, your network session key, 16 bytes (from staging.thethingsnetwork.org)
static const PROGMEM u1_t NWKSKEY[16] = { 0x45, 0x09, 0x81, 0xC9, 0x0B, 0xBB, 0x56, 0x89, 0x21, 0x02, 0x91, 0x00, 0x00, 0x00, 0x00, 0x00 };

// LoRaWAN AppSKey, application session key, 16 bytes  (from staging.thethingsnetwork.org)
static const u1_t PROGMEM APPSKEY[16] = { 0x38, 0x88, 0x51, 0x9C, 0x69, 0xD0, 0x36, 0x41, 0x3F, 0xFB, 0x93, 0x00, 0x00, 0x00, 0x00, 0x00 };

// LoRaWAN end-device address (DevAddr), ie 0x91B375AC  (from staging.thethingsnetwork.org)
static const u4_t DEVADDR = 0x26020000; // <-- Change this address for every node!

// show debug statements; comment next line to disable debug statements
#define DEBUG
// use low power sleep; comment next line to not use low power sleep
#define SLEEP

// Schedule TX every this many seconds (might become longer due to duty
// cycle limitations).
const unsigned TX_INTERVAL = 60;   

// static text, you can replace T
static uint8_t mydata[8] = { 0x03, 0x67, 0x01, 0x10, 0x05, 0x67, 0x00, 0xFF };

#ifdef SLEEP
  #include "LowPower.h"
  bool next = false;
#endif

// These callbacks are only used in over-the-air activation, so they are
// left empty here (we cannot leave them out completely unless
// DISABLE_JOIN is set in config.h, otherwise the linker will complain).
void os_getArtEui (u1_t* buf) { }
void os_getDevEui (u1_t* buf) { }
void os_getDevKey (u1_t* buf) { }

static osjob_t sendjob;

// Pin mapping
const lmic_pinmap lmic_pins = {
    .nss = 6,
    .rxtx = LMIC_UNUSED_PIN,
    .rst = 5,
    .dio = {2, 3, 4},
};

void onEvent (ev_t ev) {
    #ifdef DEBUG
      Serial.println(F("Enter onEvent"));
    #endif
    
    switch(ev) {
        case EV_SCAN_TIMEOUT:
            Serial.println(F("EV_SCAN_TIMEOUT"));
            break;
        case EV_BEACON_FOUND:
            Serial.println(F("EV_BEACON_FOUND"));
            break;
        case EV_BEACON_MISSED:
            Serial.println(F("EV_BEACON_MISSED"));
            break;
        case EV_BEACON_TRACKED:
            Serial.println(F("EV_BEACON_TRACKED"));
            break;
        case EV_JOINING:
            Serial.println(F("EV_JOINING"));
            break;
        case EV_JOINED:
            Serial.println(F("EV_JOINED"));
            break;
        case EV_RFU1:
            Serial.println(F("EV_RFU1"));
            break;
        case EV_JOIN_FAILED:
            Serial.println(F("EV_JOIN_FAILED"));
            break;
        case EV_REJOIN_FAILED:
            Serial.println(F("EV_REJOIN_FAILED"));
            break;
        case EV_TXCOMPLETE:
            Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)"));
            if(LMIC.dataLen) {
                // data received in rx slot after tx
                Serial.print(F("Data Received: "));
                Serial.write(LMIC.frame+LMIC.dataBeg, LMIC.dataLen);
                Serial.println();
            }
            // Schedule next transmission
#ifndef SLEEP
            os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);
#else
            next = true;
#endif
            
            break;
        case EV_LOST_TSYNC:
            Serial.println(F("EV_LOST_TSYNC"));
            break;
        case EV_RESET:
            Serial.println(F("EV_RESET"));
            break;
        case EV_RXCOMPLETE:
            // data received in ping slot
            Serial.println(F("EV_RXCOMPLETE"));
            break;
        case EV_LINK_DEAD:
            Serial.println(F("EV_LINK_DEAD"));
            break;
        case EV_LINK_ALIVE:
            Serial.println(F("EV_LINK_ALIVE"));
            break;
         default:
            Serial.println(F("Unknown event"));
            break;
    }
    #ifdef DEBUG
      Serial.println(F("Leave onEvent"));
    #endif
    
}

void do_send(osjob_t* j){
    // Check if there is not a current TX/RX job running
    if (LMIC.opmode & OP_TXRXPEND) {
        Serial.println(F("OP_TXRXPEND, not sending"));
    } else {
        // Prepare upstream data transmission at the next possible time. 
      Payload.reset();
      
      // Get temperature event and print its value.

      int temp = dht.readTemperature(false);
      if (isnan(temp)) {
        Serial.println(F("Error reading temperature!"));
      }
      else {
        Serial.print(F("Temperature: "));
        Serial.print(temp);
        Serial.println(F(" *C"));
      }
      
      // Get humidity event and print its value.
      int humidity = dht.readHumidity();
      if (isnan(humidity)) {
        Serial.println("Error reading humidity!");
      }
      else {
        Serial.print(F("Humidity: "));
        Serial.print(humidity);
        Serial.println(F("%"));
      }

       Payload.addTemperature(0, temp);
       Payload.addRelativeHumidity(1, humidity);

      LMIC_setTxData2(1, Payload.getBuffer(), Payload.getSize(), 0);
      Serial.println(F("Packet queued"));
      // Next TX is scheduled after TX_COMPLETE event.
    }

}


void setup() {
    Serial.begin(9600);
    Serial.println(F("Enter setup"));
    
    #ifdef VCC_ENABLE
    // For Pinoccio Scout boards
    pinMode(VCC_ENABLE, OUTPUT);
    digitalWrite(VCC_ENABLE, HIGH);
    delay(1000);
    #endif

    // LMIC init
    os_init();
    
    // Reset the MAC state. Session and pending data transfers will be discarded.
    LMIC_reset();

    // Set static session parameters. Instead of dynamically establishing a session
    // by joining the network, precomputed session parameters are be provided.
    #ifdef PROGMEM
    // On AVR, these values are stored in flash and only copied to RAM
    // once. Copy them to a temporary buffer here, LMIC_setSession will
    // copy them into a buffer of its own again.
    uint8_t appskey[sizeof(APPSKEY)];
    uint8_t nwkskey[sizeof(NWKSKEY)];
    memcpy_P(appskey, APPSKEY, sizeof(APPSKEY));
    memcpy_P(nwkskey, NWKSKEY, sizeof(NWKSKEY));
    LMIC_setSession (0x1, DEVADDR, nwkskey, appskey);
    #else
    // If not running an AVR with PROGMEM, just use the arrays directly 
    LMIC_setSession (0x1, DEVADDR, NWKSKEY, APPSKEY);
    #endif

    // Set up the channels used by the Things Network, which corresponds
    // to the defaults of most gateways. Without this, only three base
    // channels from the LoRaWAN specification are used, which certainly
    // works, so it is good for debugging, but can overload those
    // frequencies, so be sure to configure the full frequency range of
    // your network here (unless your network autoconfigures them).
    // Setting up channels should happen after LMIC_setSession, as that
    // configures the minimal channel set.
    LMIC_setupChannel(0, 903900000, DR_RANGE_MAP(DR_SF10, DR_SF7),  BAND_CENTI);      // g-band
    LMIC_setupChannel(1, 904100000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI);      // g-band
    LMIC_setupChannel(2, 904300000, DR_RANGE_MAP(DR_SF10, DR_SF7),  BAND_CENTI);      // g-band
    LMIC_setupChannel(3, 904500000, DR_RANGE_MAP(DR_SF10, DR_SF7),  BAND_CENTI);      // g-band
    LMIC_setupChannel(4, 904700000, DR_RANGE_MAP(DR_SF10, DR_SF7),  BAND_CENTI);      // g-band
    LMIC_setupChannel(5, 904900000, DR_RANGE_MAP(DR_SF10, DR_SF7),  BAND_CENTI);      // g-band
    LMIC_setupChannel(6, 905100000, DR_RANGE_MAP(DR_SF10, DR_SF7),  BAND_CENTI);      // g-band
    LMIC_setupChannel(7, 905300000, DR_RANGE_MAP(DR_SF10, DR_SF7),  BAND_CENTI);      // g-band
    LMIC_setupChannel(8, 904600000, DR_RANGE_MAP(DR_SF8,  DR_SF8),  BAND_CENTI);      // g2-band
    // TTN defines an additional channel at 869.525Mhz using SF9 for class B
    // devices' ping slots. LMIC does not have an easy way to define set this
    // frequency and support for class B is spotty and untested, so this
    // frequency is not configured here.

    // Disable link check validation
    LMIC_setLinkCheckMode(0);

    // Set data rate and transmit power (note: txpow seems to be ignored by the library)
    LMIC_setDrTxpow(DR_SF7,14);

    // Start job
    do_send(&sendjob);
    
    #ifdef DEBUG
      Serial.println(F("Leave setup"));
    #endif
}

void loop() {

#ifndef SLEEP

  os_runloop_once();
  
#else
  extern volatile unsigned long timer0_overflow_count;

  if (next == false) {

    os_runloop_once();

  } else {

    int sleepcycles = TX_INTERVAL / 8;  // calculate the number of sleepcycles (8s) given the TX_INTERVAL
    #ifdef DEBUG
      Serial.print(F("Enter sleeping for "));
      Serial.print(sleepcycles);
      Serial.println(F(" cycles of 8 seconds"));
    #endif
    Serial.flush(); // give the serial print chance to complete
    for (int i=0; i<sleepcycles; i++) {
      // Enter power down state for 8 s with ADC and BOD module disabled
      LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
      //LowPower.idle(SLEEP_8S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF, SPI_OFF, USART0_OFF, TWI_OFF);

      // LMIC uses micros() to keep track of the duty cycle, so
      // hack timer0_overflow for a rude adjustment:
      cli();
      timer0_overflow_count+= 8 * 64 * clockCyclesPerMicrosecond();
      sei();
    }
    #ifdef DEBUG
      Serial.println(F("Sleep complete"));
    #endif
    next = false;
    // Start job
    do_send(&sendjob);
  }
  
#endif

}