![](/media/cache/profiles/profiel_pic.jpg.50x50_q85.jpg)
Code example to regularly report light level and temperature over Sigfox on the QW dev kit
This is a code example that demonstrates sending the light level sensor and temperature sensor output over Sigfox at regular time intervals.
The payload that is sent over the network consists of 3 bytes:
- two bytes light level reading
- one bye temperature reading.
Use this code example as a start to connect your own device over Sigfox with the Quicksand QW development kit.
main.cpp
- Committer:
- LievenHollevoet
- Date:
- 2016-03-08
- Revision:
- 0:9a93fff79b27
File content as of revision 0:9a93fff79b27:
/* This program is an example application that measures the temperature and the light level * and transmits the sensor readings over the Sigfox network. * A transmission is scheduled every 15 minutes, and the user can force a transmission * by pressing the user button one. * * The data format of the Sigfox payload is: * First two bytes of the payload: light level as unsigned 16-bit value. * Third byte of the payload: temperature as signed 8-bit value * * Open a serial console to the board to get a debug trace. * * Note: this is a very basic example that has no energy usage optimization. The controller is not put in sleep mode * in between readings/Sigfox transmissions in order to keep the code flow linear and short. * * In the current configuration, the temperature sensor is read once per second and a Sigfox transmission is scheduled every 15 minutes. * Adapt the defines TX_INTERVAL and MEASURE_INTERVAL to change these settings. */ #include "mbed.h" #include "math.h" #include "LinearTempSensor.h" #include "VCNL4010.h" #define SER_BUFFER_SIZE 32 // Interval in minutes for scheduled Tx #define TX_INTERVAL 15 // Temperature measure interval in seconds #define MEASURE_INTERVAL 1 /* The 4 onboard LEDs */ DigitalOut LED_0 (PB_6); DigitalOut LED_1 (PA_7); DigitalOut LED_2 (PA_6); DigitalOut LED_3 (PA_5); /* The 2 user buttons */ InterruptIn SW1(PA_8); InterruptIn SW2(PB_10); /* Proximity and ambient light sensor*/ VCNL40x0 VCNL4010(PB_9, PB_8, VCNL40x0_ADDRESS); // SDA, SCL pin and I2C address /*Temperature sensor */ LinearTempSensor sensor(PA_0, 40); /* Ticker for scheduled transmissions */ Ticker tTX; Ticker tSense; /* Function prototypes */ void sw1interrupt(); void sw2interrupt(); void sertmout(); bool read_acc(int& x, int& y, int& z); bool modem_command_check_ok(char * command); void modem_setup(); void txData(); void dataScheduledTX(); void senseTemperature(); bool ser_timeout = false; bool handleIRQ1 = false; /* Serial port over USB */ Serial pc(USBTX, USBRX); /* Serial connection to sigfox modem */ Serial modem(PA_9, PA_10); int main() { /* Storage for VCNL4010 readout */ unsigned char ID=0, Current=0; //unsigned int ProxiValue=0, AmbiValue=0; /* Variables that will store analog temperature sensor reading */ //float Tav, To; /* Setup TD120x */ wait(3); modem_setup(); /* Turn off all LED */ LED_0 = 1; LED_1 = 1; LED_2 = 1; LED_3 = 1; /* Setup button interrupts */ SW2.fall(&sw2interrupt); SW1.fall(&sw1interrupt); /* Read VCNL40x0 product ID revision register */ VCNL4010.ReadID (&ID); pc.printf("\nVCNL4010 Product ID Revision Register: %d", ID); VCNL4010.SetCurrent (20); // Set current to 200mA VCNL4010.ReadCurrent (&Current); // Read back IR LED current pc.printf("\nVCNL4010 IR LED Current: %d\n\n", Current); // Sense temperature for the first time senseTemperature(); wait_ms(3000); // wait 3s (only for display) tTX.attach(&dataScheduledTX, TX_INTERVAL*60); // Attach the timer for TX tSense.attach(&senseTemperature, MEASURE_INTERVAL); // Attach the timer for sensing the temperature while(1) { /* // VCNL4010 reading VCNL4010.ReadProxiOnDemand (&ProxiValue); // read prox value on demand VCNL4010.ReadAmbiOnDemand (&AmbiValue); // read ambi value on demand // MCP9700 reading Tav = sensor.GetAverageTemp(); To = sensor.GetLatestTemp(); pc.printf("\n\rVCNL4010 report: Proximity: %5.0i cts, Ambient light: %5.0i cts, Illuminance: %7.2f lx\n\rMCP9700 report: Average Temp: %.2f %cC, Latest Temp: %.2f %cC", ProxiValue, AmbiValue, AmbiValue/4.0, Tav, 176, To, 176); wait_ms(5000); */ if (handleIRQ1) { txData(); handleIRQ1 = false; } } } void modem_setup() { /* Reset to factory defaults */ if(modem_command_check_ok("AT&F")) { pc.printf("Factory reset succesfull\r\n"); } else { pc.printf("Factory reset TD120x failed\r\n"); } /* Disable local echo */ modem.printf("ATE0\n"); if(modem_command_check_ok("ATE0")) { pc.printf("Local echo disabled\r\n"); } /* Write to mem */ if(modem_command_check_ok("AT&W")) { pc.printf("Settings saved!\r\n"); } } bool modem_command_check_ok(char * command) { /* first clear serial data buffers */ while(modem.readable()) modem.getc(); /* Timeout for response of the modem */ Timeout tmout; ser_timeout = false; /* Buffer for incoming data */ char responsebuffer[6]; /* Flag to set when we get 'OK' response */ bool ok = false; bool error = false; /* Print command to TD120x */ modem.printf(command); /* Newline to activate command */ modem.printf("\n"); /* Wait untill serial feedback, max 3 seconds before timeout */ tmout.attach(&sertmout, 3.0); while(!modem.readable()&& ser_timeout == false); while(!ok && !ser_timeout && !error) { if(modem.readable()) { for(int i = 0; i < 5; i++) { responsebuffer[i] = responsebuffer[i+1]; } responsebuffer[5] = modem.getc(); if(responsebuffer[0] == '\r' && responsebuffer[1] == '\n' && responsebuffer[2] == 'O' && responsebuffer[3] == 'K' && responsebuffer[4] == '\r' && responsebuffer[5] == '\n' ) { ok = true; } else if(responsebuffer[0] == '\r' && responsebuffer[1] == '\n' && responsebuffer[2] == 'E' && responsebuffer[3] == 'R' && responsebuffer[4] == 'R' && responsebuffer[5] == 'O' ) { error = true; } } } tmout.detach(); return ok; } /* Button 1 ISR */ void sw1interrupt() { pc.printf("\n\rButton 1 pressed\n\r"); LED_1 = 0; handleIRQ1 = true; } /* Button 2 ISR */ void sw2interrupt() { pc.printf("\n\rButton 2 pressed\n\r"); } void dataScheduledTX() { pc.printf("\n\rScheduled Sigfox TX triggered\n\r"); LED_1 = 0; handleIRQ1 = true; } /* ISR for serial timeout */ void sertmout() { ser_timeout = true; } /* TX data over Sigfox */ void txData (){ unsigned int ambiValue = 0; int8_t tAvgByte = 0; uint16_t ambiValueShort; float tAvg; char command[32]; VCNL4010.ReadAmbiOnDemand (&ambiValue); // read ambi value on demand tAvg = sensor.GetAverageTemp(); tAvgByte = (int8_t)tAvg; ambiValueShort = (uint16_t)ambiValue; sprintf(command, "AT$SF=%04X%02X,2,0\n", ambiValueShort, tAvgByte); pc.printf("Sending ambient light level %i cts and temperature %i degrees C over Sigfox\n", ambiValueShort, tAvgByte); pc.printf("using modem command: %s", command); modem_command_check_ok(command); LED_1 = 1; } void senseTemperature() { float vOut = sensor.Sense(); //pc.printf("\n\rMCP9700 reading: Vout: %.2f mV", vOut); }