Jordan Ford / Mbed 2 deprecated CapSense

Measure capacitances by counting rising edges of a 555 astable oscillator.

Dependencies:   4DGL-uLCD-SE mbed

main.cpp@0:292d0c987fe3, 2014-03-24 (annotated)

Committer:
jford38
Date:
Mon Mar 24 19:47:55 2014 +0000
Revision:
0:292d0c987fe3
Capacitive Sensing using 555 astable oscillator

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jford38 0:292d0c987fe3 1 #include "mbed.h"
jford38 0:292d0c987fe3 2 #include "capSense.h"
jford38 0:292d0c987fe3 3 #include "uLCD_4DGL.h"
jford38 0:292d0c987fe3 4
jford38 0:292d0c987fe3 5
jford38 0:292d0c987fe3 6 #define RA 19770 // ohms
jford38 0:292d0c987fe3 7 #define RB 9053 // ohms
jford38 0:292d0c987fe3 8 #define PERIOD 2000000 //us
jford38 0:292d0c987fe3 9
jford38 0:292d0c987fe3 10 uLCD_4DGL uLCD(p9, p10, p11); // lcd connection
jford38 0:292d0c987fe3 11 CapSense cap(RA, RB, PERIOD, p21);
jford38 0:292d0c987fe3 12
jford38 0:292d0c987fe3 13 int main() {
jford38 0:292d0c987fe3 14 uLCD.locate(3,5); //setting the cursor to the middle
jford38 0:292d0c987fe3 15
jford38 0:292d0c987fe3 16 while(1) {
jford38 0:292d0c987fe3 17 uLCD.locate(0,6); // setting cursor
jford38 0:292d0c987fe3 18 float capacitance = cap.measure();
jford38 0:292d0c987fe3 19 uLCD.printf("Capacitance:\n%f uF \n\n", capacitance);
jford38 0:292d0c987fe3 20 uLCD.printf("Frequency:\n%f Hz ",(float)cap._count/PERIOD*1000000);
jford38 0:292d0c987fe3 21 }
jford38 0:292d0c987fe3 22 }