0

I made an program so if I turn on my rotary encoder the position and the rotation comes on a LCD screen. But I need to change it a bit up for my teacher, she wants to see the graph of the pulses on the serial monitor. I searched it up and can't find a solution? Any help?

My program: 

#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd(0x27,16,2); 
#define outputA 2 
#define outputB 4 
int counter = 0; 
int angle = 0; 
int aState; 
int aLastState; 
int lastAngle = 0; 
String rotationDirection; 
String savedRotationDirection;

void setup() {
  pinMode (outputA,INPUT);
  pinMode (outputB,INPUT);

  aLastState = digitalRead(outputA);
  lcd.begin();


     } 

void loop() {
  aState = digitalRead(outputA);
  if (aState != aLastState){     
     if (digitalRead(outputB) != aState) { 
       counter ++;
       angle ++;
     }
     else {
       counter--;
       angle --;
     }
     if (counter >=30 ) {
      counter = 0;
     } 

     if (angle < lastAngle){
      rotationDirection = "CCW";
     }
     else {
      if (angle > lastAngle){
        rotationDirection = "CW";
      }
      else {
        rotationDirection = savedRotationDirection;
      }
     }
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print("Position: ");
     lcd.print(int(angle)*(-1));
     lcd.print((char)223); 
     lcd.setCursor(0,1);
     lcd.print("Rotation: ");
     lcd.print(rotationDirection);
     savedRotationDirection = rotationDirection;
     lastAngle = angle;
  }
  aLastState = aState;

}
Improve this question
4
  • My program: is hard to read formatted like that – Jaromanda X Feb 24 '18 at 12:19
  • 1
    almost every Arduino example uses prints to Serial Monitor – Juraj Feb 24 '18 at 12:21
  • I searched it up ... what did you search for? – jsotola Feb 24 '18 at 18:27
  • Just a few comments on your code: 1. You can remove counter, as you never use it. 2. aState and rotationDirection should be local variables. 3. savedRotationDirection serves no useful purpose: you can just remove every line in which it appears. 4. lastAngle is not useful either: you know the angle increases when you do angle++, and it decreases when you do angle--. – Edgar Bonet Feb 26 '18 at 9:42
2

Add Serial.begin(115200); in setup() and use Serial.println() or Serial.print() to print to Serial.

In Arduino IDE open Serial Monitor and set baud rate to 115200.

EDIT: The question turned out to be about Serial Plotter. Maximilian Gerhardt answered in a comment :

If you want multiple data streams (graphs) you need to seperate them by a comma: Serial.println( String(digitalRead(outputA)) + "," + String(digitalRead(outputB)));

Improve this answer
6
  • Nothing's happening. My question is how to see the graph of the pulse in the serial monitor? – user43154 Feb 24 '18 at 12:56
  • Serial Plotter in IDE? – Juraj Feb 24 '18 at 13:17
  • Used it but still nothing happens. – user43154 Feb 24 '18 at 14:38
  • Used this: Serial.println(digitalRead(outputA)); Serial.println(digitalRead(outputB)); Now I only get one of the 2. Is there a way to get both but under eachother? – user43154 Feb 24 '18 at 14:41
  • 1
    If you want multiple data streams (graphs) you need to seperate them by a comma: Serial.println( String(digitalRead(outputA)) + "," + String(digitalRead(outputB))); (norwegiancreations.com/2016/01/…) @user43154 – Maximilian Gerhardt Feb 24 '18 at 14:46

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.