Andrea Corrado / Mbed OS water_flow_rate

water flow sensor, k64f https://www.adafruit.com/product/828

main.cpp@1:f9f5db2931e9, 2019-01-17 (annotated)

Committer:
andcor02
Date:
Thu Jan 17 14:08:21 2019 +0000
Revision:
1:f9f5db2931e9
Parent:
0:9d07fa1b15a7 
fixed formatting error.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andcor02 0:9d07fa1b15a7 1 #include "mbed.h"
andcor02 0:9d07fa1b15a7 2
andcor02 0:9d07fa1b15a7 3 DigitalOut myled(LED1);
andcor02 1:f9f5db2931e9 4 InterruptIn sensor(PTB10);
andcor02 0:9d07fa1b15a7 5
andcor02 0:9d07fa1b15a7 6 Serial pc(USBTX, USBRX);
andcor02 0:9d07fa1b15a7 7
andcor02 0:9d07fa1b15a7 8 int NbTopsFan;
andcor02 0:9d07fa1b15a7 9 int Calc;
andcor02 0:9d07fa1b15a7 10
andcor02 0:9d07fa1b15a7 11 void rpm() //This function increments on the rising edge of the hall effect sensors signal
andcor02 0:9d07fa1b15a7 12 {
andcor02 0:9d07fa1b15a7 13 NbTopsFan++;
andcor02 0:9d07fa1b15a7 14 }
andcor02 0:9d07fa1b15a7 15
andcor02 0:9d07fa1b15a7 16 int main() {
andcor02 0:9d07fa1b15a7 17
andcor02 0:9d07fa1b15a7 18 while(1) {
andcor02 0:9d07fa1b15a7 19
andcor02 0:9d07fa1b15a7 20 NbTopsFan = 0; //Set NbTops to 0 ready for calculations
andcor02 0:9d07fa1b15a7 21 myled=1;
andcor02 0:9d07fa1b15a7 22 sensor.rise(&rpm); //Enables rising edge interrupt
andcor02 0:9d07fa1b15a7 23 wait_ms(1000); //Wait 1 second and count HALL pulses
andcor02 0:9d07fa1b15a7 24 sensor.rise(NULL); //Disable interrupt
andcor02 0:9d07fa1b15a7 25 myled=0;
andcor02 0:9d07fa1b15a7 26
andcor02 0:9d07fa1b15a7 27 Calc = (NbTopsFan * 60) / 7.5; //(Pulse frequency x 60) / 7.5Q, = flow rate in L/hour
andcor02 0:9d07fa1b15a7 28
andcor02 0:9d07fa1b15a7 29 pc.printf ("Flow L/hour: %d\r\n",Calc); //Prints the number calculated above
andcor02 0:9d07fa1b15a7 30 }
andcor02 0:9d07fa1b15a7 31 }