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motorized-fader-arduino/fadercontrol/fadercontrol.pde
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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). | |
} |