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/* -----------------------------------------------------------------------
* Programmer: Cody Hazelwood
* Date: March 20, 2012
* Platform: Arduino Uno
* Description: Calibrates a motorized fader's max and min
* position. Allows changing the position with an
* external potentiometer. Uses a capacitance
* sensing circuit for touch sensitivity.
* More or less a proof of concept to be used in a future
* project.
* Dependencies: CapSense Arduino Library (for fader touch sensitivity)
* http://www.arduino.cc/playground/Main/CapSense
* -----------------------------------------------------------------------
* Copyright (c) 2012 Cody Hazelwood
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
* -----------------------------------------------------------------------
*/
#include <CapSense.h> //Library for fader touch sensitivity
//Arduino Pin Assignments
const int motorDown = 3; //H-Bridge control to make the motor go down
const int motorUp = 5; //H-Bridge control to make the motor go up
//Inputs
const int wiper = 0; //Position of fader relative to GND (Analog 0)
const int pot = 3; //Potentiometer to set position of fader (Analog 3)
const int touchSend = 7; //Send pin for Capacitance Sensing Circuit (Digital 7)
const int touchReceive = 8; //Receive pin for Capacitance Sensing Circuit (Digital 8)
//Variables
double faderMax = 0; //Value read by fader's maximum position (0-1023)
double faderMin = 0; //Value read by fader's minimum position (0-1023)
CapSense touchLine = CapSense(touchSend, touchReceive);
volatile bool touched = false; //Is the fader currently being touched?
void setup() {
pinMode (motorUp, OUTPUT);
pinMode (motorDown, OUTPUT);
calibrateFader();
}
void loop() {
int state = analogRead(pot); //Read the state of the potentiometer
checkTouch(); //Checks to see if the fader is being touched
if (state < analogRead(wiper) - 10 && state > faderMin && !touched) {
digitalWrite(motorDown, HIGH);
while (state < analogRead(wiper) - 10 && !touched) {}; //Loops until motor is done moving
digitalWrite(motorDown, LOW);
}
else if (state > analogRead(wiper) + 10 && state < faderMax && !touched) {
digitalWrite(motorUp, HIGH);
while (state > analogRead(wiper) + 10 && !touched) {}; //Loops until motor is done moving
digitalWrite(motorUp, LOW);
}
}
//Calibrates the min and max position of the fader
void calibrateFader() {
//Send fader to the top and read max position
digitalWrite(motorUp, HIGH);
delay(250);
digitalWrite(motorUp, LOW);
faderMax = analogRead(wiper);
//Send fader to the bottom and read max position
digitalWrite(motorDown, HIGH);
delay(250);
digitalWrite(motorDown, LOW);
faderMin = analogRead(wiper);
}
//Check to see if the fader is being touched
void checkTouch() {
touched = touchLine.capSense(30) > 700; //700 is arbitrary and may need to be changed
//depending on the fader cap used (if any).
}