Demo of a weather station sending temperature and humidity values over LORA to TTN.
Dependencies: DHT libmDot mbed-rtos mbed
Fork of mDot_LoRa_example_TTN_connect by
main.cpp
- Committer:
- nicoschtein
- Date:
- 2015-11-19
- Revision:
- 8:60007735feed
- Parent:
- 7:609e7bb06486
File content as of revision 8:60007735feed:
#include "mbed.h"
#include "mDot.h"
#include "MTSLog.h"
#include <string>
#include <vector>
#include <algorithm>
#include "DHT.h"
// these options must match the settings on your Conduit
// TTN Keys
static const uint8_t netowork_session_key_array[] = {0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C};
static const uint8_t data_session_key_array[] = {0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C};
// uncomment the following lines and edit their values to match your configuration
static const uint8_t network_address_array[] = {0x02, 0x01, 0xBA, 0x16}; // use yours based on http://thethingsnetwork.org/wiki/AddressSpace
static std::vector<uint8_t> netowork_session_key (netowork_session_key_array, netowork_session_key_array + sizeof(netowork_session_key_array) / sizeof(uint8_t));
static std::vector<uint8_t> data_session_key (data_session_key_array, data_session_key_array + sizeof(data_session_key_array) / sizeof(uint8_t));
static std::vector<uint8_t> network_address (network_address_array, network_address_array + sizeof(network_address_array) / sizeof(uint8_t));
static uint8_t config_frequency_sub_band = 4;
int main() {
int32_t ret;
mDot* dot;
std::vector<uint8_t> data;
DHT sensor(PA_11,DHT11); // Use the DHT11 sensor connected to Vcc GND and on pin D7 UKD2
std::string data_str = "Hello Nico!";
// get a mDot handle
dot = mDot::getInstance();
dot->resetConfig();
dot->setLogLevel(mts::MTSLog::DEBUG_LEVEL);
// too lazzy to check all errors
dot->setJoinMode(mDot::MANUAL);
dot->setPublicNetwork(true);
dot->setFrequencySubBand(config_frequency_sub_band);
dot->setNetworkSessionKey(netowork_session_key);
dot->setDataSessionKey(data_session_key);
dot->setNetworkAddress(network_address);
// a higher spreading factor allows for longer range but lower throughput
// in the 915 (US) frequency band, spreading factors 7 - 10 are available
// in the 868 (EU) frequency band, spreading factors 7 - 12 are available
logInfo("setting TX spreading factor");
if ((ret = dot->setTxDataRate(mDot::SF_10)) != mDot::MDOT_OK) {
logError("failed to set TX datarate %d:%s", ret, mDot::getReturnCodeString(ret).c_str());
}
// request not to receive confirmation of packets from the gateway since TTN doesn't support it
logInfo("enabling ACKs");
if ((ret = dot->setAck(0)) != mDot::MDOT_OK) {
logError("failed to enable ACKs %d:%s", ret, mDot::getReturnCodeString(ret).c_str());
}
// save this configuration to the mDot's NVM
logInfo("saving config");
if (! dot->saveConfig()) {
logError("failed to save configuration");
}
//*******************************************
// end of configuration
//*******************************************
// attempt to join the network
logInfo("joining network");
while ((ret = dot->joinNetwork()) != mDot::MDOT_OK) {
logError("failed to join network %d:%s", ret, mDot::getReturnCodeString(ret).c_str());
// in the 868 (EU) frequency band, we need to wait until another channel is available before transmitting again
osDelay(std::max((uint32_t)1000, (uint32_t)dot->getNextTxMs()));
}
int sensor_error = 0;
float temp = 0;
float humid = 0;
int update_period = 5000;
std::string separator_str = ",";
char string_buffer[64];
while (true) {
data.clear();
sensor_error = sensor.readData();
if (sensor_error !=0)
printf("\r\nErr %i \n",sensor_error);
while ( sensor_error != 0 ) {
sensor_error = sensor.readData();
osDelay(100);
}
// TEMP
temp = sensor.ReadTemperature(CELCIUS);
sprintf(string_buffer, "%4.2f", temp);
for (int i = 0; i<strlen(string_buffer); i++)
{
data.push_back(((char*)string_buffer)[i]);
}
// SEPARATOR
data.push_back((uint8_t) *separator_str.begin());
// HUMIDITY
humid = sensor.ReadHumidity();
sprintf(string_buffer, "%4.2f", humid);
for (int i = 0; i<strlen(string_buffer); i++)
{
data.push_back(((char*)string_buffer)[i]);
}
logInfo("Temperature is %4.2f C",temp);
logInfo("Temperature is %4.2f F",sensor.ReadTemperature(FARENHEIT));
logInfo("Temperature is %4.2f K",sensor.ReadTemperature(KELVIN));
logInfo("Humidity is %4.2f",humid);
logInfo("Dew point is %4.2f",sensor.CalcdewPoint(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity()));
logInfo("Dew point (fast) is %4.2f",sensor.CalcdewPointFast(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity()));
logDebug("Sending LoRa message, length: %d", data.size());
logDebug("sending data: ");
for(int i = 0; i < data.size(); i++)
{
printf("%c", data[i]);
}
printf("\n");
if ((ret = dot->send(data)) != mDot::MDOT_OK)
{
logError("failed to send", ret, mDot::getReturnCodeString(ret).c_str());
} else
{
logInfo("successfully sent data to gateway");
data.clear();
if ((ret = dot->recv(data)) != mDot::MDOT_OK) {
logError("failed to rec", ret, mDot::getReturnCodeString(ret).c_str());
} else {
logDebug("successfully recd data from gateway");
logDebug("recv data size: %i\n",data.size());
logDebug("recv data: ");
for(int i = 0;i < data.size();i++) {
printf("%c", data[i]);
}
printf("\n");
}
}
osDelay(std::max((uint32_t)update_period, (uint32_t)dot->getNextTxMs()));
}
return 0;
}
