Can someone explain how to add the slider object so it controls its own individual servo motor?

Question

The problem is that every time I add a slider object and try to connect it to a different servo motor through a different pin the sliders both only control the same servo motor. It won't allow for me to add a servo motor that controls each servo motor independently through the user-interface. I'm using Processing as the interface and Arduino as the IDE.

I have tried adding other slider objects but they all still control the same servo. I do not know if the issue is through Arrduino or Processing. When I add the other sliders, I connect them to their own pins but it still doesn't allow for them to be controlled individually.

Processing code:

import processing.serial.*;
import cc.arduino.*;
import controlP5.*;
ControlP5 controlP5;
Arduino arduino;
int servoAngle = 90;
void setup() {

 size(400,400);

 println(Arduino.list());
 arduino = new Arduino(this, Arduino.list()[0], 57600);

 for (int i = 0; i <= 13; i++)
 arduino.pinMode(i, Arduino.OUTPUT);

 controlP5 = new ControlP5(this);
 controlP5.addSlider("servoAngle",0,180,servoAngle,20,10,180,20);

}
void draw() {
 arduino.analogWrite(9, servoAngle);
 //delay(15);
}

Arduino code:

    #include <Servo.h>
    #include <Firmata.h>
    Servo servos[MAX_SERVOS];
    byte servoPinMap[TOTAL_PINS];
    byte servoCount = 0;

void analogWriteCallback(byte pin, int value)
{
  if (IS_PIN_DIGITAL(pin)) {
    servos[servoPinMap[pin]].write(value);
  }
}

void systemResetCallback()
{
  servoCount = 0;
}

void setup()
{
  byte pin;

  Firmata.setFirmwareVersion(FIRMATA_FIRMWARE_MAJOR_VERSION, 
  FIRMATA_FIRMWARE_MINOR_VERSION);
  Firmata.attach(ANALOG_MESSAGE, analogWriteCallback);
  Firmata.attach(SYSTEM_RESET, systemResetCallback);

  Firmata.begin(57600);
  systemResetCallback();

  // attach servos from first digital pin up to max number of
  // servos supported for the board
  for (pin = 0; pin < TOTAL_PINS; pin++) {
    if (IS_PIN_DIGITAL(pin)) {
      if (servoCount < MAX_SERVOS) {
        servoPinMap[pin] = servoCount;
        servos[servoPinMap[pin]].attach(PIN_TO_DIGITAL(pin));
        servoCount++;
      }
    }
  }
}

void loop()
{
  while (Firmata.available())
    Firmata.processInput();
}

I would like to be able to add 3 more sliders that to the one already created but be able to control 4 servo motors, each controlled by its own slider, but the result I'm getting is that each additional slider is controlling the same motors.

Dr Yuan Shenghai Dr Yuan Shenghai · Accepted Answer · 2019-05-24T17:20:04

totally depend on which hardware you are running. but i think you have to change a few places

(1) decelar all trackbar value and the pwm

 int servoAngle = 90; int servoAngle1 = 90; int servoAngle2 = 90; int servoAngle3 = 90;

(2) is add track bar

controlP5.addSlider("servoAngle",0,180,servoAngle,20,10,180,20);
controlP5.addSlider("servoAngle1",0,180,servoAngle1,20,10,180,20);
controlP5.addSlider("servoAngle2",0,180,servoAngle2,20,10,180,20);
controlP5.addSlider("servoAngle3",0,180,servoAngle3,20,10,180,20);

(3) link up the hardware pin. totally hardware depended, not sure which 1 u are using. ill jus tput here as sample

 arduino.analogWrite(9, servoAngle);
 arduino.analogWrite(10, servoAngle);
 arduino.analogWrite(11, servoAngle);
 arduino.analogWrite(12, servoAngle);
 //delay(15);
}

that should more or less do it. You know many years ago, we have to write our own processing to arduino serial protocol to do this.

Can someone explain how to add the slider object so it controls its own individual servo motor?

1 Answers