Found an example of a sketch which works with a DHT22 temp/humidity sensor attached to the Dragino shield.This is for the AU_915 frequency band
/*******************************************************************************
* Copyright (c) 2015 Thomas Telkamp and Matthijs Kooijman
* Copyright (c) 2018 Terry Moore, MCCI
* Copyright (c) 2018 Betina Wendel and Thomas Laurenson
*
* 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 WORKS ON TTN V3*******************.
* Sketch Summary:Modified by DL for dht22 sensor
* Target device: Dragino LoRa Shield (US900) with Arduino Uno
* Target frequency: AU915 sub-band 2 (916.8 to 918.2 uplink)
* Authentication mode: Over the Air Authentication (OTAA)
* Connect DHT22 temp/humidity sensor to Dragino Shield as follows
* + to 3.3V - to Gnd and Data to D4
* This example requires the following modification before upload:
* 1) Enter a valid Application EUI (APPEUI)
* For example: { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
* 2) Enter a valid Device EUI (DEVEUI)
* For example: { 0x33, 0x22, 0x11, 0x11, 0x88, 0x88, 0x11, 0x22 };
* This is little endian format, so it is in reverse order that the server
* provides. In the example above, the original value was: 2211888811112233
* 3) Enter a valid Application Key (APPKEY)
* For example: { 0xe4, 0x17, 0xd3, 0x3b, 0xef, 0xf3, 0x80, 0x7c, 0x7c, 0x6e, 0x42, 0x43, 0x56, 0x7c, 0x21, 0xa7 };
*
* The DEVEUI and APPKEY values should be obtained from your LoRaWAN server
* (e.g., TTN or any private LoRa provider). APPEUI is set to zeroes as
* the LoRa Server project does not requre this value.
*
*******************************************************************************/
#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>
// include the DHT22 Sensor Library
#include <DHT.h>
#include <DHT_U.h>
#include <Adafruit_Sensor.h>
//
// For normal use, we require that you edit the sketch to replace FILLMEIN
// with values assigned by the TTN console. However, for regression tests,
// we want to be able to compile these scripts. The regression tests define
// COMPILE_REGRESSION_TEST, and in that case we define FILLMEIN to a non-
// working but innocuous value.
//
#ifdef COMPILE_REGRESSION_TEST
# define FILLMEIN 0
#else
# warning "You must replace the values marked FILLMEIN with real values from the TTN control panel!"
# define FILLMEIN (#dont edit this, edit the lines that use FILLMEIN)
#endif
// This EUI must be in little-endian format, so least-significant-byte
// first. When copying an EUI from ttnctl output, this means to reverse
// the bytes. For TTN issued EUIs the last bytes should be 0xD5, 0xB3,
// 0x70.
static const u1_t PROGMEM APPEUI[8]= { 0xEE, 0xE4, 0x03, 0xD0, 0x7E, 0xD5, 0xB3, 0x70 };
void os_getArtEui (u1_t* buf) { memcpy_P(buf, APPEUI, 8);}
// This should also be in little endian format, see above.
static const u1_t PROGMEM DEVEUI[8]= { 0x90, 0x45, 0x12, 0x32, 0x65, 0x89, 0x65, 0x34 };
void os_getDevEui (u1_t* buf) { memcpy_P(buf, DEVEUI, 8);}
// This key should be in big endian format (or, since it is not really a
// number but a block of memory, endianness does not really apply). In
// practice, a key taken from the TTN console can be copied as-is.
static const u1_t PROGMEM APPKEY[16] = { 0xC3, 0x9B, 0xBC, 0x57, 0x87, 0xA1, 0x36, 0xFE, 0x4B, 0xBF, 0xF3, 0xE2, 0xBD, 0xD2, 0x2D, 0x66 };
void os_getDevKey (u1_t* buf) { memcpy_P(buf, APPKEY, 16);}
static uint8_t mydata[] = "OTAA";
static osjob_t sendjob;
// Schedule TX every this many seconds (might become longer due to duty
// cycle limitations).
const unsigned TX_INTERVAL = 60;
// Pin mapping for Dragino Lorashield
const lmic_pinmap lmic_pins = {
.nss = 10,
.rxtx = LMIC_UNUSED_PIN,
.rst = 9,
.dio = {2, 6, 7},
};
// DHT digital pin and sensor type
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
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"));
{
u4_t netid = 0;
devaddr_t devaddr = 0;
u1_t nwkKey[16];
u1_t artKey[16];
LMIC_getSessionKeys(&netid, &devaddr, nwkKey, artKey);
Serial.print("netid: ");
Serial.println(netid, DEC);
Serial.print("devaddr: ");
Serial.println(devaddr, HEX);
Serial.print("artKey: ");
for (int i=0; i<sizeof(artKey); ++i) {
Serial.print(artKey[i], HEX);
}
Serial.println("");
Serial.print("nwkKey: ");
for (int i=0; i<sizeof(nwkKey); ++i) {
Serial.print(nwkKey[i], HEX);
}
Serial.println("");
}
Serial.println(F("Successful OTAA Join..."));
// Disable link check validation (automatically enabled
// during join, but because slow data rates change max TX
// size, we don't use it in this example.
LMIC_setLinkCheckMode(0);
break;
/*
|| This event is defined but not used in the code. No
|| point in wasting codespace on it.
||
|| 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;
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.print(F("Received "));
Serial.print(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;
/*
|| This event is defined but not used in the code. No
|| point in wasting codespace on it.
||
|| case EV_SCAN_FOUND:
|| Serial.println(F("EV_SCAN_FOUND"));
|| break;
*/
case EV_TXSTART:
Serial.println(F("EV_TXSTART"));
break;
default:
Serial.print(F("Unknown event: "));
Serial.println((unsigned) ev);
break;
}
}
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 {
uint32_t humidity = dht.readHumidity(false) * 100;
uint32_t temperature = dht.readTemperature(false) * 100;
Serial.println("Humidity: " + String(humidity));
Serial.println("Temperature: " + String(temperature));
byte payload[4];
payload[0] = highByte(humidity);
payload[1] = lowByte(humidity);
payload[2] = highByte(temperature);
payload[3] = lowByte(temperature);
//Prepare upstream data transmission at the next possible time.
LMIC_setTxData2(1, payload, sizeof(payload), 0);
Serial.println(F("Packet queued"));
}
// Next TX is scheduled after TX_COMPLETE event.
}
void setup() {
Serial.begin(115200);
Serial.println(F("Starting"));
dht.begin();
//-----------------------------
#ifdef VCC_ENABLE
// For Pinoccio Scout boards
pinMode(VCC_ENABLE, OUTPUT);
digitalWrite(VCC_ENABLE, HIGH);
delay(1000);
#endif
#if defined(CFG_au921)
Serial.println(F("Loading AU915/AU921 Configuration..."));
#endif
// LMIC init
os_init();
// Reset the MAC state. Session and pending data transfers will be discarded.
LMIC_reset();
LMIC_setDrTxpow(DR_SF7, 14);
LMIC_selectSubBand(1);
LMIC_setClockError(MAX_CLOCK_ERROR * 1 / 100);
// Start job (sending automatically starts OTAA too)
do_send(&sendjob);
}
void loop() {
os_runloop_once();
}
