Help Shaft encoder ..,

Programming Support VEXcode Pro V5 Text Tech Support
#1

Hello good evening I would like someone to help me urgently to create a program for the shaft encoder sensor not very accurate and when I start it again the program does different things, does anyone know why that happens?

#2

Gonna need more context than that… what exactly are you trying to do? what does your code look like? if it could potentially be a mechanical problem (slop might be a factor), can you post a pic of the bot?

1 Like
#3 

void avanza(int distancia){
  //insertamos la posicion, velocidad y direccion que deseamos que tengan los motores. 
  EncoderA.setPosition(0, degrees);
  rightmotor.spin(forward);
  rightmotor.setVelocity(50, percent);
  leftmotor.spin(forward);
  leftmotor.setVelocity(50, percent);
  /*mientras la posicion del encoder sea mayor a la distancia introducida, los motores 
  iran hacia adelante.
  */
  while (!(EncoderA.position(degrees) > distancia)) {
    Brain.Screen.print(".%2f", EncoderA.position(degrees));
    Brain.Screen.setCursor(1, 1);//brain screen sirve para imprimir los grados que avanza el enconder, en la pantalla del brain.
    wait(100, msec);
    Brain.Screen.clearScreen();//la pantalla se limpia cuando se cumple la condicion.
    wait(5, msec);
  }
  // los motores se detienen cuando se cumple la condicion.
  rightmotor.stop();
  leftmotor.stop();
}
#4

This is my program friend

#5

IMG_20210520_193347

1 Like
#6

I’m still not sure what you’re using the encoder for exactly

Are you using the integrated motor encoders or a separate one, and where and for what? are you trying to make the robot drive a certain distance?

there will always be backlash/slop in the parts so it’ll never move perfectly. you need to account for that mechanically with things like lock bars and shoulder bolts, and/or compensate on the software side with something like PID loop

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#7

I am using it to turn the encoder certain degrees separately, I have one encoder in the base part and another in the launcher part, but I would like something more complex like using it for distance and to be able to make a good launch and that it is not changed, so sometimes yes and sometimes no

#8

So you are attempting the print the encoder value on the Brain Screen until its reaches the desired distance?