main.cpp

00001 #include "counter.h"
00002 
00003 //todo: implement 2k sample buffer and store results until client connects, implement real time clock
00004 
00005 Serial pc(USBTX, USBRX);
00006 counter SF800 (p29);
00007 Timer t_a, t_b;
00008 
00009 int main() {
00010 
00011     t_a.start();
00012     t_b.start();
00013     int a_init_pulses = 0;
00014     int b_init_pulses = 0;
00015     float flowrate = 0;
00016     int time_window = 10000;
00017 
00018     bool a_b_flip_flop = true; // if true use window a
00019     
00020     pc.printf("\n\r*************\n\rMBED restarted\n\r*************\n");
00021 
00022     while (1) {
00023         wait(0.1);
00024 
00025         if (a_b_flip_flop) {
00026             flowrate = (float)(SF800.getPulses() - a_init_pulses)/(6000 * t_a.read_ms() / 60000);
00027         } else {
00028             flowrate = (float)(SF800.getPulses() - b_init_pulses)/(6000 * t_b.read_ms() / 60000);
00029         }
00030 
00031         if (t_a.read_ms() > time_window) { // switch to window B
00032         
00033             pc.printf("\rswitching to window B = %i pulses detected in window A\n", SF800.getPulses() - a_init_pulses);
00034         
00035             t_a.reset();
00036             a_b_flip_flop = false;
00037             a_init_pulses =  SF800.getPulses();
00038         }
00039         
00040         if (t_a.read_ms() > time_window/2 && !a_b_flip_flop) { // switch to window A
00041         
00042             pc.printf("\rswitching to window A = %i pulses detected in window B\n", SF800.getPulses() - b_init_pulses);
00043         
00044             t_b.reset();
00045             a_b_flip_flop = true;
00046             b_init_pulses =  SF800.getPulses();
00047         }
00048 
00049         pc.printf("\rflowrate = %f l/min", flowrate);
00050     }
00051 
00052 }