A simple LoRaWAN temperature sensor based on Multitech mDot module.
Dependencies: DS1820 libmDot mbed-rtos mbed
main.cpp
- Committer:
- SomeRandomBloke
- Date:
- 2015-09-21
- Revision:
- 2:9db840d12557
- Parent:
- 1:45cec6aea002
- Child:
- 3:367aa95f9771
File content as of revision 2:9db840d12557:
/** mDot_DS18B20 - Simple mDot temperature sensor using Dallas Semiconductors DS18B20 OneWire temperature sensor. * * Uses MultiTech mDot developer board http://www.multitech.com/models/94558010LF * Requires a MultiTech MultiConnect Conduit http://www.multitech.com/models/94557203LF * * Example JSON received on Conduit: { "chan": 5, "codr": "4/5", "datr": "SF9BW125", "freq": "869.5", "lsnr": "8.8", "modu": "LORA", "rfch": 1, "rssi": -41, "seqn": 13, "size": 12, "timestamp": "2015-07-22T21:19:11Z", "tmst": 517590990, "payload": "{\"tmp\":21.3}", "eui": "00:80:00:00:00:00:9a:63", "_msg id": "73bcd8dd.8c4328" } * */ #include "mbed.h" #include "DS1820.h" #include "mDot.h" #include "MTSLog.h" #include "MTSText.h" #include <string> #include <vector> using namespace mts; // these options must match the settings on your Conduit in // /var/config/lora/lora-network-server.conf static std::string config_network_name = "ThingInnovations"; static std::string config_network_pass = "donkey123"; //static uint8_t config_frequency_sub_band = 1; // mDot/dev board activity LED //#define ACTIVITY_LED PA_0 // DS18B20 OneWire pin // D13 on Dev Board, pin x on mDot #define DATA_PIN PA_5 // A0 on Dev Board, pin x on mDot //#define DATA_PIN PB_1 DS1820 probe(DATA_PIN); //void log_error(mDot* dot, const char* msg, int32_t retval); Serial pc(USBTX,USBRX); int main() { int32_t ret; mDot* dot; std::vector<uint8_t> send_data; std::vector<uint8_t> recv_data; float temperature = 0.0; pc.baud(115200); pc.printf("mDot LoRa Temperature sensor\n\r"); // get a mDot handle dot = mDot::getInstance(); dot->setLogLevel(MTSLog::TRACE_LEVEL); logInfo("Checking Config"); // Test if we've already saved the config std::string configNetworkName = dot->getNetworkName(); // Check pin, if low then reset config. // if ((ret = dot->setJoinMode( mDot::AUTO_OTA )) != mDot::MDOT_OK) { // logError("failed to set join mode %d:%s", ret, mDot::getReturnCodeString(ret).c_str()); // } if( config_network_name.compare(configNetworkName) != 0 ) { // Not saved config, reset logInfo("Setting Config"); // reset to default config so we know what state we're in dot->resetConfig(); // Set byte order - AEP less than 1.0.30 // dot->setJoinByteOrder(mDot::MSB); dot->setJoinByteOrder(mDot::LSB); logInfo("setting Join mode"); if ((ret = dot->setJoinMode(mDot::AUTO_OTA)) != mDot::MDOT_OK) { logError("failed to set Join Mode %d:%s", ret, mDot::getReturnCodeString(ret).c_str()); } // If on developer board then you can enable activity LED // Currently no spare pins that LEDs are connected too. // dot->setActivityLedPin( ACTIVITY_LED ); // dot->setActivityLedEnable(false); // Have a decent nubmer of retries in connecting to LoRaWAN dot->setJoinRetries( 3 ); // Set Spreading Factor, higher is lower data rate, smaller packets but longer range // Lower is higher data rate, larger packets and shorter range. // dot->setTxDataRate( mDot::SF_9 ); dot->setTxDataRate( mDot::SF_12 ); dot->setTxPower( 14 ); dot->setAck( 0 ); // 1 retries on Ack, 0 to disable // Not applicable for 868MHz in EU // if ((ret = dot->setFrequencySubBand(config_frequency_sub_band)) != mDot::MDOT_OK) { // initStatus = false; // logError(dot, "failed to set frequency sub band", ret); // } if ((ret = dot->setNetworkName(config_network_name)) != mDot::MDOT_OK) { // initStatus = false; logError("failed to set network name %d:%s", ret, mDot::getReturnCodeString(ret).c_str()); } if ((ret = dot->setNetworkPassphrase(config_network_pass)) != mDot::MDOT_OK) { // initStatus = false; logError("failed to set network password %d:%s", ret, mDot::getReturnCodeString(ret).c_str()); } if ((ret = dot->setJoinMode( mDot::AUTO_OTA )) != mDot::MDOT_OK) { logError("failed to set join mode %d:%s", ret, mDot::getReturnCodeString(ret).c_str()); } logInfo("Saving Config"); // Save config if (! dot->saveConfig()) { logError("failed to save configuration"); } } else { logInfo("Using existing Config"); } while ((ret = dot->joinNetwork()) != mDot::MDOT_OK) { logError("failed to join network [%d][%s]", ret, mDot::getReturnCodeString(ret).c_str()); //wait(2); wait_ms(dot->getNextTxMs() + 1); } probe.setResolution(9); char dataBuf[50]; // for (uint8_t i = 0; i < iterations; i++) { while( 1 ) { // This takes upto 750mS, way too long. Change to 9 bit resolution if not already used. probe.convertTemperature(true, DS1820::all_devices); //Start temperature conversion, wait until ready // printf("It is %3.1fC\r\n", probe.temperature()); // Output data as JSON e.g. {"temperature":"21.3"} temperature = probe.temperature(); sprintf(dataBuf, "{\"tmp\":%3.1f}", temperature ); send_data.clear(); // probably not the most efficent way to do this for( int i=0; i< strlen(dataBuf); i++ ) send_data.push_back( dataBuf[i] ); if ((ret = dot->send(send_data)) != mDot::MDOT_OK) { logError("failed to send: [%d][%s]", ret, mDot::getReturnCodeString(ret).c_str()); } else { logInfo("send data: %s", Text::bin2hexString(send_data).c_str()); } // Should sleep here and wakeup after a set interval. uint32_t sleep_time = (dot->getNextTxMs() / 1000) + 60; logInfo("going to sleep for %d seconds", sleep_time); // go to sleep and wake up automatically sleep_time seconds later dot->sleep(sleep_time, mDot::RTC_ALARM); /* next_tx = dot->getNextTxMs() + 1; logInfo("waiting %ld ms to transmit again", next_tx); wait_ms(next_tx); logInfo("waiting another %d seconds", wait_time); wait(wait_time); */ } return 0; }