Motorized Faders – S1:E38

Published: 30 September 2013
Categories: Lets Make It

This week we do some demonstrations on how to make a motorized fader move to where you want it to go.

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Motorized Fader Test 1

/*######################### MOTORIZED FADER TEST 1 ############################

      This fader test program will set the fader to one of 2 positions based on
    the button that is pressed.
      
      For more examples of stepper motor control refer to the show notes at
      http://tech-zen.tv.
 
  From: Mike Myers (http://mikemyers.me)  @netnutmike
      Let's Make It Episode 38 at http://tech-zen.tv
      
      http://tech-zen.tv
      
      For the sample code, show notes, contact information and many more
      videos, visit the show page at http://tech-zen.tv/letsmakeit
     
      Please subscribe to our YouTube channel or our netcasts at any of
      your favorite netcast / podcast outlets.

            We normally record Let's Make It live on Monday evenings around
      9pm eastern. You can watch it live by going to tech-zen.tv and clicking
      the live link at the top of the page.

      We also have a community setup for our viewers and listeners. You can
      join the community by going to community.tech-zen.tv.
     
      We love input on what you would like to know or if you have an idea for
      a new Let's Make it episode, you can contact us via email or phone at
      the show information page.
################################################################################*/
 
#include <AccelStepper.h>
#include <AFMotor.h>
 
#define forward  36
#define backward  38
 
int sensorPin = A8;
int sensorValue = 0;
 
int motorspeed = 250;
 
AF_DCMotor motor(3);
 
void setup()
{  
    pinMode(forward, INPUT_PULLUP);
    pinMode(backward, INPUT_PULLUP);
    motor.setSpeed(motorspeed);
 
    motor.run(RELEASE);
    Serial.begin(9600);
} 

void loop()
{    
 if (!digitalRead(forward)) {
    Serial.println("F");
    setFaderPos(75);
 } else if (!digitalRead(backward)) {
    Serial.println("B");
    setFaderPos(20);
 } else {
    motor.run(RELEASE);
 }
}

void setFaderPos(int pos)
{
 int curpos;
 curpos = map(analogRead(sensorPin), 480, 1024, 0, 100);
 
 while (abs(curpos - pos) > 1) {    
    if (curpos > pos)
     motor.run(FORWARD);
    else if (curpos < pos)
     motor.run(BACKWARD);

    curpos = map(analogRead(sensorPin), 480, 1024, 0, 100);

 }
 motor.run(RELEASE);
}

Motorized Fader Test2

/*######################### MOTORIZED FADER TEST 2 ############################
      This sketch takes the encoder code from Episode 35 and uses it to control
      a stepper motor.  We turn the encoder clockwise and the stepper motor turns
      clockwise as well.  Same thing for turning the encoder counter clockwise.
 
  From: Mike Myers (http://mikemyers.me)  @netnutmike
      Let's Make It Episode 38 at http://tech-zen.tv
      
      http://tech-zen.tv
      
      For the sample code, show notes, contact information and many more
      videos, visit the show page at http://tech-zen.tv/letsmakeit
     
      Please subscribe to our YouTube channel or our netcasts at any of
      your favorite netcast / podcast outlets.
     
      We normally record Let's Make It live on Monday evenings around
      9pm eastern. You can watch it live by going to tech-zen.tv and clicking
      the live link at the top of the page.
     
      We also have a community setup for our viewers and listeners. You can
      join the community by going to community.tech-zen.tv.
 
      We love input on what you would like to know or if you have an idea for
      a new Let's Make it episode, you can contact us via email or phone at
      the show information page.
################################################################################*/


#include <AccelStepper.h>
#include <AFMotor.h>
 
#define forward  36
#define backward  38
 
int sensorPin = A8;
int sensorValue = 0;
 
int motorspeed = 250;
 
AF_DCMotor motor(3);
 
void setup()
{  
    pinMode(forward, INPUT_PULLUP);
    pinMode(backward, INPUT_PULLUP);
    motor.setSpeed(motorspeed);
 
    motor.run(RELEASE);
    Serial.begin(9600);
}
 
void loop()
{  
 setFaderPos(0);
 Serial.println("0");
 delay(2000);
 
 setFaderPos(33);
 Serial.println("33");
 delay(2000);
 
 setFaderPos(75);
 Serial.println("75");
 delay(2000);
 
 setFaderPos(100);
 Serial.println("100");
 delay(2000);
 
 setFaderPos(25);
 Serial.println("25");
 delay(2000);
 
 setFaderPos(60);
 Serial.println("60");
 delay(2000);
 
 
 if (!digitalRead(forward)) {
    Serial.println("F");
    setFaderPos(0);
 } else if (!digitalRead(backward)) {
    Serial.println("B")
    setFaderPos(100);
 } else {
    motor.run(RELEASE);
    //Serial.println(analogRead(sensorPin));
 }
     
}
 
void setFaderPos(int pos)
{
 int curpos;
 
 curpos = map(analogRead(sensorPin), 480, 1024, 0, 100);
 
 while (abs(curpos - pos) > 1) {    
    if (curpos > pos)
     motor.run(FORWARD);
    else if (curpos < pos)
     motor.run(BACKWARD);
   
    curpos = map(analogRead(sensorPin), 480, 1024, 0, 100);
 }
 motor.run(RELEASE);
}