Rotary encoder DRO. Inexpensive! fitted to RF30 Mill CNC,

I've done a CNC conversion to my RF30 mill. I still want to be able to use it manually. Easy enough on X &Y. I needed a DRO for the Z axis.

Feb 25, 2021

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digital read out

rf30 milling machine

rotary encoder

Devices & Components

Arduino Uno Rev3

I2C Serial 2004 20x4 LCD

Enclosure for Arduino Uno

Incremental Rotary Encoder Dc5-24V Wide Voltage Power Supply Shaft 6Mm

Hardware & Tools

AXMINSTER ENGINEER SERIES ZX30M MILL DRILL

Project description

Code

Z axis DRO

arduino

This is a sketch based on Practice Makes Better's original sketch for a lathe DRO .This is only my second Arduino project and I'm no expert on Arduino sketches but this one works for me. A lot of sketches I have seen have the line :- LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); I couldn't get this to work and after doing some research there seems to be quite a few people having problems. I couldn't find a reason... I have re-written some of the original code and it works for me.

1#include <Wire.h> 
2#include <LiquidCrystal_I2C.h>
3#include <Encoder.h>//   Encoder library.
4Encoder myEnc(2,3);// Connected to Digital pins 2 and 3.
5LiquidCrystal_I2C   lcd(0x27,20,4);  
6
7void setup() {
8  lcd.init();                      //   initialize the lcd 
9  lcd.backlight();
10  
11}
12long oldPosition = -999;
13
14
15void   loop()
16 {
17  const float Wv = (.1 * PI*.9848) / 600; // Math formula for 20   tooth pulley
18                                    //and 600 pulse/revolution encoder.
19
20   lcd.setCursor(7, 0); // (Column 7,ROW 0) (Column #0-19,Row #0-3
21  lcd.print("Z   Axis");
22  lcd.setCursor(2, 1);
23  lcd.print("inch");
24  lcd.setCursor(14,   1);
25  lcd.print("mm");
26  lcd.setCursor(5, 2);
27  lcd.print("Z Axis DRO");//   Graphic symbols for a Z axis left and right travel.
28  long newPosition = myEnc.read();
29   if (newPosition != oldPosition)
30  lcd.setCursor (0, 0);
31  lcd.print (newPosition);   // Display number of pulses, 1"~=1902.2 pulses.                       
32  lcd.setCursor(2,   3);
33  lcd.print(Wv * newPosition, 3);//Math formula * Encoder reading ,3 decimals
34   lcd.setCursor(9, 1);
35  lcd.print("|");// Graphic symbol to separate imperial   and metric display.
36  lcd.setCursor(9, 3);
37  lcd.print("|");
38  lcd.setCursor(11,   3);
39  lcd.print(Wv * newPosition * 25.4, 2); // Formula to convert imperial
40                                          // and metric, 2 decimals.
41}
42

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Encoder.h>//   Encoder library.
Encoder myEnc(2,3);// Connected to Digital pins 2 and 3.
LiquidCrystal_I2C   lcd(0x27,20,4);  

void setup() {
  lcd.init();                      //   initialize the lcd 
  lcd.backlight();
  
}
long oldPosition = -999;


void   loop()
 {
  const float Wv = (.1 * PI*.9848) / 600; // Math formula for 20   tooth pulley
                                    //and 600 pulse/revolution encoder.

   lcd.setCursor(7, 0); // (Column 7,ROW 0) (Column #0-19,Row #0-3
  lcd.print("Z   Axis");
  lcd.setCursor(2, 1);
  lcd.print("inch");
  lcd.setCursor(14,   1);
  lcd.print("mm");
  lcd.setCursor(5, 2);
  lcd.print("Z Axis DRO");//   Graphic symbols for a Z axis left and right travel.
  long newPosition = myEnc.read();
   if (newPosition != oldPosition)
  lcd.setCursor (0, 0);
  lcd.print (newPosition);   // Display number of pulses, 1"~=1902.2 pulses.                       
  lcd.setCursor(2,   3);
  lcd.print(Wv * newPosition, 3);//Math formula * Encoder reading ,3 decimals
   lcd.setCursor(9, 1);
  lcd.print("|");// Graphic symbol to separate imperial   and metric display.
  lcd.setCursor(9, 3);
  lcd.print("|");
  lcd.setCursor(11,   3);
  lcd.print(Wv * newPosition * 25.4, 2); // Formula to convert imperial
                                          // and metric, 2 decimals.
}

Z axis DRO

arduino

1#include <Wire.h> 
2#include <LiquidCrystal_I2C.h>
3#include <Encoder.h>//  Encoder library.
4Encoder myEnc(2,3);// Connected to Digital pins 2 and 3.
5LiquidCrystal_I2C  lcd(0x27,20,4);  
6
7void setup() {
8  lcd.init();                      //  initialize the lcd 
9  lcd.backlight();
10  
11}
12long oldPosition = -999;
13
14
15void  loop()
16 {
17  const float Wv = (.1 * PI*.9848) / 600; // Math formula for 20  tooth pulley
18                                    //and 600 pulse/revolution encoder.
19
20  lcd.setCursor(7, 0); // (Column 7,ROW 0) (Column #0-19,Row #0-3
21  lcd.print("Z  Axis");
22  lcd.setCursor(2, 1);
23  lcd.print("inch");
24  lcd.setCursor(14,  1);
25  lcd.print("mm");
26  lcd.setCursor(5, 2);
27  lcd.print("Z Axis DRO");//  Graphic symbols for a Z axis left and right travel.
28  long newPosition = myEnc.read();
29  if (newPosition != oldPosition)
30  lcd.setCursor (0, 0);
31  lcd.print (newPosition);  // Display number of pulses, 1"~=1902.2 pulses.                       
32  lcd.setCursor(2,  3);
33  lcd.print(Wv * newPosition, 3);//Math formula * Encoder reading ,3 decimals
34  lcd.setCursor(9, 1);
35  lcd.print("|");// Graphic symbol to separate imperial  and metric display.
36  lcd.setCursor(9, 3);
37  lcd.print("|");
38  lcd.setCursor(11,  3);
39  lcd.print(Wv * newPosition * 25.4, 2); // Formula to convert imperial
40                                         // and metric, 2 decimals.
41}
42

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Encoder.h>//  Encoder library.
Encoder myEnc(2,3);// Connected to Digital pins 2 and 3.
LiquidCrystal_I2C  lcd(0x27,20,4);  

void setup() {
  lcd.init();                      //  initialize the lcd 
  lcd.backlight();
  
}
long oldPosition = -999;


void  loop()
 {
  const float Wv = (.1 * PI*.9848) / 600; // Math formula for 20  tooth pulley
                                    //and 600 pulse/revolution encoder.

  lcd.setCursor(7, 0); // (Column 7,ROW 0) (Column #0-19,Row #0-3
  lcd.print("Z  Axis");
  lcd.setCursor(2, 1);
  lcd.print("inch");
  lcd.setCursor(14,  1);
  lcd.print("mm");
  lcd.setCursor(5, 2);
  lcd.print("Z Axis DRO");//  Graphic symbols for a Z axis left and right travel.
  long newPosition = myEnc.read();
  if (newPosition != oldPosition)
  lcd.setCursor (0, 0);
  lcd.print (newPosition);  // Display number of pulses, 1"~=1902.2 pulses.                       
  lcd.setCursor(2,  3);
  lcd.print(Wv * newPosition, 3);//Math formula * Encoder reading ,3 decimals
  lcd.setCursor(9, 1);
  lcd.print("|");// Graphic symbol to separate imperial  and metric display.
  lcd.setCursor(9, 3);
  lcd.print("|");
  lcd.setCursor(11,  3);
  lcd.print(Wv * newPosition * 25.4, 2); // Formula to convert imperial
                                         // and metric, 2 decimals.
}

Downloadable files

Encoder wiring diagram

Schematic for connecting the rotary encoder to the Arduino Uno. Provided by PracticeMakesBetter

Encoder wiring diagram

Schematic for connecting the rotary encoder to the Arduino Uno. Provided by PracticeMakesBetter

Encoder wiring diagram

Documentation

Schematic for LCD I2C to Arduino

How to connect an LCD I2C to Arduino

Schematic for LCD I2C to Arduino

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