Send DHT11 & SHT10 sensors data through LoRa SX1272 board.
Dependencies: DHT11 SHTx SX1272Lib mbed
Fork of SX1272-Transmitter by
main.cpp
- Committer:
- Antoine38
- Date:
- 2017-04-03
- Revision:
- 23:711e46d8c9c6
- Parent:
- 22:e6a5e6cf38cb
File content as of revision 23:711e46d8c9c6:
#include "mbed.h" #include "main.h" // SX1272 Lib #include "sx1272-hal.h" #include "debug.h" // DHT11 Lib (air temperature and humidity) #include "DHT11.h" // SHT10 (soil temperature and humidity) #include "SHTx/sht15.hpp" /* Set this flag to '1' to display debug messages on the console */ #define DEBUG_MESSAGE 1 /* DELAY between two transmission (in seconds) */ #define TRANSMISSION_DELAY 1800 #define RF_FREQUENCY 868000000 // Hz #define TX_OUTPUT_POWER 14 // 14 dBm #define LORA_BANDWIDTH 2 // [0: 125 kHz, // 1: 250 kHz, // 2: 500 kHz, // 3: Reserved] #define LORA_SPREADING_FACTOR 7 // [SF7..SF12] #define LORA_CODINGRATE 1 // [1: 4/5, // 2: 4/6, // 3: 4/7, // 4: 4/8] #define LORA_PREAMBLE_LENGTH 8 #define LORA_SYMBOL_TIMEOUT 5 // Symbols #define LORA_FIX_LENGTH_PAYLOAD_ON false #define LORA_FHSS_ENABLED false #define LORA_NB_SYMB_HOP 4 #define LORA_IQ_INVERSION_ON false #define LORA_CRC_ENABLED true #define BUFFER_SIZE 6 // Define the payload size here DigitalOut led(LED1); /*! * Radio events function pointer */ static RadioEvents_t RadioEvents; /* * Global variables declarations */ SX1272MB2xAS Radio( NULL ); uint8_t msg[BUFFER_SIZE]; uint16_t BufferSize = BUFFER_SIZE; uint8_t Buffer[BUFFER_SIZE]; // Air temperature and humidity sensor DHT11 airSensor(D6); int DHT11_state; // Soil temperature and humidity sensor SHTx::SHT15 soilSensor(D9, D8); int main() { debug( "\n\n\r iGreenhouse Application - Transmitter \n\n\r" ); // Initialize Radio driver RadioEvents.TxDone = OnTxDone; RadioEvents.TxTimeout = OnTxTimeout; Radio.Init( &RadioEvents ); // verify the connection with the board while( Radio.Read( REG_VERSION ) == 0x00 ) { debug( "Radio could not be detected!\n\r", NULL ); wait( 1 ); } debug_if( ( DEBUG_MESSAGE & ( Radio.DetectBoardType( ) == SX1272MB2XAS ) ) , "\n\r > Board Type: SX1272MB2xAS < \n\r" ); Radio.SetChannel( RF_FREQUENCY ); debug_if( LORA_FHSS_ENABLED, "\n\n\r > LORA FHSS Mode < \n\n\r"); debug_if( !LORA_FHSS_ENABLED, "\n\n\r > LORA Mode < \n\n\r"); Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH, LORA_SPREADING_FACTOR, LORA_CODINGRATE, LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON, LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP, LORA_IQ_INVERSION_ON, 2000000 ); // Soil sensor configuration soilSensor.setOTPReload(false); soilSensor.setResolution(true); soilSensor.setScale(false); debug_if( DEBUG_MESSAGE, "Starting sending loop\r\n" ); led = 0; while(1) { // Retrieving sensors data DHT11_state = airSensor.readData(); soilSensor.update(); if (DHT11_state == DHT11::OK) { msg[0] = airSensor.readTemperature(); // Temperature - Air msg[1] = airSensor.readHumidity(); // Humidity - Air } else { msg[0] = 0x00; // Temperature - Air msg[1] = 0x00; // Humidity - Air } msg[2] = to_u8(soilSensor.getTemperature(), true); // Temperature - Soil msg[3] = to_u8(soilSensor.getHumidity(), false); // Humidity - Soil // Measurements types - Should be 0111 0010 -> 0x72 msg[4] = 0x72; // Greenhouse num 1 and sensors in the middle - Should be 0001 0001 msg[5] = 0x11; // id serre // Sending a new packet debug("\r\n========\r\nSending a new Packet\r\n========\r\n"); for(int i = 0; i < BufferSize; i++) { debug("%x", msg[i]); } debug_if( DEBUG_MESSAGE, "\n" ); memcpy( Buffer, msg, BufferSize ); wait_ms(10); Radio.Send(Buffer, BufferSize); // Switch the led state led = 1-led; // wait X seconds before resend data //wait(TRANSMISSION_DELAY); wait(5); } } // temperature: -30 < x < 70 // humidity: 0 < x < 100 uint8_t to_u8(float x, bool isTemp) { float a = 0; float min = 0.0; float max = 100.0; if( isTemp) { min = -30.0; max = 70.0; a = 30.0; } // On passe le float entre 0 et 1.0 if(x > min && x < max) { x = (x + a) / 100.0; } else if(x <= min) { x = 0.0; } else { x = 1.0; } return rint(x * 255); } void OnTxDone( void ) { Radio.Sleep( ); debug_if( DEBUG_MESSAGE, "> OnTxDone\n\r" ); } void OnTxTimeout( void ) { Radio.Sleep( ); debug_if( DEBUG_MESSAGE, "> OnTxTimeout\n\r" ); }