通过物联网收集农业数据

function Decoder(b, port) {
  
 var counter = b[0] << 8) | b[1];
 var moisture = b[2] | b[3] << 8;
 var temp= ( b[4] | b[5] << 8 )/100;
 var lat = ( b[6] | b[7] << 8 | b[8] << 16 | (b[8] & 0x80 ? 0xFF << 24 : 0)) / 10000;
 var lon = ( b[9] | b[10] << 8 | b[11] << 16 | (b[11] & 0x80 ? 0xFF << 24 : 0)) / 10000;

  return {
    field1: counter,
    field2: moisture,
    field3: temp,
    latitude: lat,
    longitude: lon
  }
}

#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>
#include "DHT.h"
#include <Adafruit_GPS.h>

#define DHTPIN 5
#define GPSSerial Serial1
#define SOIL_PIN 14
#define SOIL_POWER_PIN 11
#define GPSECHO false   // Set to 'true' if you want to debug and listen to the raw GPS sentences
#define PAYLOAD_SIZE 13 // Number of bytes sent plus 2


// LoRaWAN NwkSKey, network session key
static const PROGMEM u1_t NWKSKEY[16] = {0x98, 0xEB, 0x1A, 0xC5, 0xF9, 0x20, 0x15, 0xCD, 0x12, 0xE5, 0x72, 0xFF, 0xCD, 0xE2, 0x94, 0x46};
// LoRaWAN AppSKey, application session key
static const u1_t PROGMEM APPSKEY[16] = {0x50, 0x28, 0x4D, 0xAE, 0xEA, 0x41, 0x53, 0x7E, 0xCA, 0x70, 0xD2, 0x26, 0xCC, 0x14, 0x66, 0x19};
// LoRaWAN end-device address (DevAddr)
static const u4_t DEVADDR = 0x26021115;

// Callbacks are only used in over-the-air activation. Leave these variables empty unless you use over the air activation.
void os_getArtEui(u1_t *buf) {}
void os_getDevEui(u1_t *buf) {}
void os_getDevKey(u1_t *buf) {}

// Payload to send to TTN gateway
static uint8_t payload[PAYLOAD_SIZE];
static osjob_t sendjob;

// Schedule TX at least this many seconds
const unsigned TX_INTERVAL = 60; //was 30

// Pin mapping for Adafruit Feather M0 LoRa
const lmic_pinmap lmic_pins = {
    .nss = 8,
    .rxtx = LMIC_UNUSED_PIN,
    .rst = 4,
    .dio = {3, 6, LMIC_UNUSED_PIN},
    .rxtx_rx_active = 0,
    .rssi_cal = 8, // LBT cal for the Adafruit Feather M0 LoRa, in dB.
    .spi_freq = 8000000,
};

Adafruit_GPS GPS(&GPSSerial); // Connect to the GPS on the hardware port.

DHT dht(DHTPIN, DHT22);  // Connect to the temperature sensor.
uint16_t counter = 0;
int32_t myLatitude = -12345; // Initialize for testing before GPS finds a lock.
int32_t myLongitude = 54321; // Initialize for testing.
int myMoisture = 0; // 10 bit ADC value.
float temperatureF = 1111; 

void setup()
{
    Serial.begin(115200);
    dht.begin();
    Serial.println("Start");
    // Set the power pin for the moisture sensor
    pinMode(SOIL_POWER_PIN,OUTPUT);
    digitalWrite(SOIL_POWER_PIN, LOW);

    GPS.begin(9600); // 9600 NMEA is the default baud rate.
    GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
    GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ); // Set a 1 Hz update rate.

    delay(1000); // Wait for GPS to initialize.

    // Ask for firmware version
    GPSSerial.println(PMTK_Q_RELEASE);
    // Initialize the LMIC.
    os_init();
    // Reset the MAC state. Resetting discards the session and pending data transfers. 
    LMIC_reset();

    // Set static session parameters. 
    uint8_t appskey[sizeof(APPSKEY)];
    uint8_t nwkskey[sizeof(NWKSKEY)];
    memcpy_P(appskey, APPSKEY, sizeof(APPSKEY));
    memcpy_P(nwkskey, NWKSKEY, sizeof(NWKSKEY));
    LMIC_setSession(0x13, DEVADDR, nwkskey, appskey);

    LMIC_selectSubBand(1);
    // Only use the correct The Things Network channels, disable the others.
    for (int c = 0; c < 72; c++)
    {
        if ((c < 8) || (c > 15))
        {
            LMIC_disableChannel(c);
        }
    }
    
    LMIC_setClockError(MAX_CLOCK_ERROR * 1 / 100);

    // Disable link check validation
    LMIC_setLinkCheckMode(0);

    // TTN uses SF9 for its RX2 window.
    LMIC.dn2Dr = DR_SF9;

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

    // Start job.
    processJob(&sendjob);
}

void loop() // Run over and over again
{
    os_runloop_once();

    char c = GPS.read();
    if (GPSECHO)
     {
        if (c){
            Serial.print(c);
              }
     }
    // If a sentence is received, parse it
    if (GPS.newNMEAreceived())
    {
        if (!GPS.parse(GPS.lastNMEA())) // Also sets the newNMEAreceived() flag to false
            return;                   
    }
}

void GetSensorData()
{
    digitalWrite(SOIL_POWER_PIN, HIGH);
    delay(1000);
    myMoisture = analogRead(SOIL_PIN);
    digitalWrite(SOIL_POWER_PIN, LOW);
    temperatureF = dht.readTemperature( true );
    Serial.println("moisture " + String( myMoisture ) + " temp " + String( temperatureF ));
     
    if (GPS.fix)
    {
        Serial.print( "Location: " );
        Serial.print( GPS.latitudeDegrees * 100, 4 );
        Serial.print( " break " );
        Serial.print( GPS.lat );
        Serial.print( ", " );
        Serial.print( GPS.longitudeDegrees * 100 , 4 );
        Serial.println( GPS.lon );
        myLatitude = GPS.latitudeDegrees * 10000;
        myLongitude = GPS.longitudeDegrees * 10000;
    }
}

void onEvent(ev_t ev)
{
    Serial.print(os_getTime());
    Serial.print(": ");

    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_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.txrxFlags & TXRX_ACK)
            Serial.println(F("Received ack"));
        if (LMIC.dataLen)
        {
            Serial.println(F("Received "));
            Serial.println(LMIC.dataLen);
            Serial.println(F(" bytes of payload"));
        }
        // Schedule next transmission
        os_setTimedCallback(&sendjob, os_getTime() + sec2osticks(TX_INTERVAL), do_send);
        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;

    case EV_TXSTART:
        Serial.println(F("EV_TXSTART"));
        break;
    default:
        Serial.print(F("Unknown event: "));
        Serial.println((unsigned)ev);
        break;
    }
}

void processJob(osjob_t *j)
{
    getSensorData();
    
    if (LMIC.opmode & OP_TXRXPEND) // Check if there is a current TX/RX job running.
    {
        Serial.println(F("OP_TXRXPEND, not sending"));
    }
    else
    {
        payload[0] = byte(counter);
        payload[1] = counter >>8;

        payload[2] = byte(myMoisture);
        payload[3] = myMoisture >> 8;

        int shiftTemp = int(temperatureF * 100); // Convert temperature float to integer for sending and save two places.
        payload[4] = byte(shiftTemp);
        payload[5] = shiftTemp >> 8;

        payload[6] = byte(myLatitude);
        payload[7] = myLatitude >> 8;
        payload[8] = myLatitude >> 16;

        payload[9] = byte(myLongitude);
        payload[10] = myLongitude >> 8;
        payload[11] = myLongitude >> 16;

        LMIC_setTxData2(1, payload, sizeof(payload) - 1, 0); // Prepare upstream data transmission at the next possible time.

        counter++;
        Serial.println(String(counter));
    }
    // Next TX is scheduled after TX_COMPLETE event.