main.cpp

00001 #include <stdio.h>
00002 #include "mbed.h"
00003 #include "sx1276-inAir.h"
00004 
00005 #define STRING_LENGTH 30
00006 #define SUPPLY_VOLTAGE 3.3
00007 
00008 Serial      pc(USBTX, USBRX);  //Create a serial connection to the PC
00009 AnalogIn    ain(PA_0);             //Configure pin PA0 as an analog input for the temperature sensor
00010 //DigitalIn   din(PB_10);         //Configure pin PC2 as a digital input for the reed switch
00011 InterruptIn door(PB_10);
00012 
00013 float reading_float;
00014 bool reading_bool;
00015 
00016 //Return the temperature from the sensor, in degrees celsius
00017 float getTemp() {
00018     float reading = ain.read();
00019     float output_voltage = reading * SUPPLY_VOLTAGE;
00020     return (output_voltage - 0.25) / 0.028;
00021 }
00022 
00023 //Return the door state. If True, the door is closed. If False, the door is open.
00024 bool getDoorState() {
00025     return door.read();
00026 }
00027 
00028 //Code that executes on a rising edge
00029 //For reasons unknown, this executes twice instead of once when the magnet connects
00030 //i.e. there are two falling edges. Could implement debouncing, but that takes effort
00031 void transmitDoorClosing() {
00032     printf("The door has been closed\r\n");
00033 }
00034 
00035 //Code that executes on a falling edge
00036 void transmitDoorOpening() {
00037     printf("The door has been opened\r\n");
00038 }
00039 
00040 
00041 int main() {
00042 
00043     //Configure the serial connection (baud rate = 19200, 8 data bits, 1 stop bit)
00044     pc.baud(9600);
00045     pc.format(8, SerialBase::None, 1);
00046     
00047     door.rise(transmitDoorClosing); //Rising edge occurs when the "door opens"
00048     door.fall(transmitDoorOpening); //Falling edge occurs when the "door closes"
00049 
00050     while(1) {
00051 
00052         char reading_string[STRING_LENGTH];
00053         reading_float = getTemp();
00054         sprintf(reading_string, " Temp: %.8f\r\n", reading_float);
00055         pc.printf("Temperature = %s\r\n", reading_string);
00056 
00057         wait_ms(500);
00058 
00059     }
00060 }