CapPoll.h

/*
 * CapPoll.h
 *
 * This file is part of Mozzi.
 *
 * Copyright 2015-2024 Tim Barrass and the Mozzi Team
 *
 * Mozzi is licensed under the GNU Lesser General Public Licence (LGPL) Version 2.1 or later.
 *
 */
 
#ifndef RCPOLL_H
#define RCPOLL_H
 
 
template <unsigned char SENSOR_PIN, unsigned char SEND_PIN>
class CapPoll
{
 
public:
    CapPoll():result(0),rc_cued(true), output(0)
    {
        ;
    }
 
    inline
    unsigned int next(){
        if (rc_cued){
            pinMode(SENSOR_PIN, INPUT);        // turn pin into an input and time till pin goes low
            digitalWrite(SENSOR_PIN, LOW);     // turn pullups off - or it won't work
            rc_cued = false;
        }
        if(digitalRead(SENSOR_PIN)){    // wait for pin to go low
            result++;
        }
        else{
            output = result;
            result = 0;
            pinMode(SENSOR_PIN, OUTPUT);  // make pin OUTPUT
            digitalWrite(SENSOR_PIN, HIGH);    // make pin HIGH to discharge capacitor - see the schematic
            rc_cued = true;
        }
        return output;
    }
 
private:
    unsigned int result;
    boolean rc_cued;
    unsigned int output;
 
};
 
#endif        //  #ifndef RCPOLL_H