I incorporated a couple of code changes to the stepper MTR program, one is, now when a button is pressed U can see the voltage displayed on Ln 1 of the LCD in real time, reading is taken from A0 via the ADC/mapping of the directional coils controlling direction.

2nd change is, a 50K trimmer POT, yes I experimented enough and I am convinced that this is the right value and setting for the functions that this stepper MTR program needs to perform.

Here is the code:

#include <LiquidCrystal_I2C.h>

#include <Wire.h>

/* Program 1 REV B

Updated 6/30/2017 @ 5:30:PM

Code concept and project design by David H Haffner Sr.

Stepper program for the 28YBJ-48 (stepper MTR) and ULN2003 driver

This particular stepper motor is 5.625 degrees per step

/64

Speed is controlled by a delay between each step.

The longer the delay the slower the rotation.

That delay value is obtained by reading and analog-to-digital

cover (A0 in this case/50K trimmer POT) which gives a value from 0 to 1023.

The value is divided by 4 and add 10 for a delay

in milliseconds:delay(analogRead(0)/4 +10)

For faster speeds change 10 to say 2.

This is calculated between every step to vary speed while stepping.

I incorporated unsigned long int Val, in order read a little bit more of the AN/Map

A nice feature of unsigned ints: if a val is unsigned, then val / 4 is optimized by

the compiler into a bit shift, much more efficient than the actual division you would

get if val was signed.

Further incorporated a pin array;//read the pushbutton value into a variable

int sensorVal[] = { digitalRead [2][3] };//SW1 pin2 & SW2 pin3

This will illuminat LED's #10(W) and LED #12(bl) to indicate that the switches

on HIGH. These values are then displayed on the LCD menu on line 3 as a monitor

of the switches values.

// set the LCD address to 0x27 or 0x3F for a 20 chars 4 line display

// Set the pins on the I2C chip used for LCD connections:

// addr, en,rw,rs,d4,d5,d6,d7,bl,blpol

The commands below will be compiled into machine code and uploaded

to the microcontroller.

This is in the public domain.

Compiled size 6646 bytes.

*/

const int yellow = 7; // M1

const int orange = 5; // M2

const int brown = 6; // M3

const int blue = 4; // M4

const int CW = 2; //Sw1 in schematic

const int CCW = 3; //Sw2 in schematic

unsigned long int val = (analogRead(A0) / 4 + 10);

unsigned long int val1 = (analogRead('...') * 4 + 2);// scale it to use it with the MTR (value between 0 and 175)

LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address

void setup() {

// initialize digital pin LED_BUILTIN (13) as an output.

pinMode(LED_BUILTIN, OUTPUT);//Modified "blink" sequence (2)millisec in-step/W/MTR sequence

pinMode(10, OUTPUT);// this is the LED pin for sensor val prgm

pinMode(12, OUTPUT);// this is for LED pin 12 sensor Val prgm

digitalWrite(CW, 1); // pull up on

digitalWrite(CCW, 1); // pull up on

pinMode(blue, OUTPUT);

pinMode(brown, OUTPUT);

pinMode(orange, OUTPUT);

pinMode(yellow, OUTPUT);

// all coils off

digitalWrite(blue, 0);

digitalWrite(brown, 0);

digitalWrite(orange, 0);

digitalWrite(yellow, 0);

lcd.begin(20, 4); // initialize the lcd for 20 chars 4 lines, turn on backlight

// ------- Quick 3 blinks of backlight -------------

for (int i = 0; i < 3; i++)

{

lcd.backlight();

delay(250);

lcd.noBacklight();

delay(250);

}

lcd.backlight(); // finish with backlight on

// set up the LCD's number of columns and rows:

lcd.begin(20, 4);

// Print a message to the LCD.

lcd.print("AN/MAP:");

lcd.setCursor(16, 0);

lcd.print("0-5V");

lcd.setCursor(0, 1);

lcd.print("Direction:");//CCW or CC

lcd.setCursor(0, 3);

lcd.print("SwitchState:");//4th line for version display

lcd.setCursor(0, 2);

lcd.print("DIV:");

Serial.begin(115200);

}

void loop() {

// read the input on :

for (int i = 0; i < 6; i++) {

val1 = analogRead(i);

delay(10);

// Convert the analog reading (which goes from 0 - 1023) to voltage range (0 - 5V);

float voltage0 = val1 * (5.0 / 1023.0);

// print out the value you read:

Serial.print(voltage0); Serial.print("i =");

Serial.print(i); Serial.print(";");

if (i == 5) Serial.println(" ");

lcd.setCursor(11, 0);

lcd.print(voltage0);//reads the current Voltage from A0

}

if (!digitalRead(CW)) {

forward(10);

all_coils_off();

lcd.setCursor(13, 3);// set Cursor at place 12, 3

lcd.print(CW);

}

if (!digitalRead(CCW)) {

reverse(10);

all_coils_off();

lcd.setCursor(13, 3);// set Cursor at place 12, 3

lcd.print(CCW);

}

{

digitalWrite(LED_BUILTIN, HIGH); // When button is pressed, moves MTR same# of steps as LED timing sequence

delay(1); // wait for a second

digitalWrite(LED_BUILTIN, LOW); //

delay(1); // wait for a second

}

//read the pushbutton value into a variable

int sensorVal_1 = digitalRead(CW);//SW pin

//print out the value of the pushbutton

Serial.println(sensorVal_1);

// Keep in mind the pullup means the pushbutton's

// logic is inverted. It goes HIGH when it's open,

// and LOW when it's pressed. Turn on LED pin when the

// button's pressed, and off when it's not:

if (sensorVal_1 == HIGH) {

digitalWrite(10, LOW);//LED pin

} else {

digitalWrite(10, HIGH);//LED pin

}

//read the pushbutton value into a variable

int sensorVal_2 = digitalRead(CCW);//SW pin

//print out the value of the pushbutton

Serial.println(sensorVal_2);

// Keep in mind the pullup means the pushbutton's

// logic is inverted. It goes HIGH when it's open,

// and LOW when it's pressed. Turn on LED pin when the

// button's pressed, and off when it's not:

if (sensorVal_2 == HIGH) {

digitalWrite(12, LOW);//LED pin

} else {

digitalWrite(12, HIGH);//LED pin

}

for (int i = 0; i <= 10; i++)//This keeps LED indicator LED pin on high until button is pressed

{ //then blinks in sync with rotation of motor until released

(analogRead(A0) / 4 + 10);

}

val1 = (analogRead(val1) * 4 + 2); //scale it to use it with the stepper mtr (value between 0 and 175)

} // end loop

void all_coils_off(void) {

digitalWrite(blue, 0);

digitalWrite(brown, 0);

digitalWrite(orange, 0);

digitalWrite(yellow, 0);

}

void reverse(int i) {

{

lcd.setCursor(10, 1);

lcd.print("<<CCW");

}

while (1) {

digitalWrite(blue, 1);

digitalWrite(brown, 0);

digitalWrite(orange, 1);

digitalWrite(yellow, 0);

delay(analogRead(A0) / 4 + 10);

i--;

if (i < 1) break;

{

lcd.setCursor(12, 2);//print out the value of the pushbutton

lcd.print(i--);

}

digitalWrite(blue, 0);

digitalWrite(brown, 1);

digitalWrite(orange, 1);

digitalWrite(yellow, 0);

delay(analogRead(A0) / 4 + 10);

i--;

if (i < 1) break;

{

lcd.setCursor(7, 0);

lcd.print(analogRead(i--) / 4 + 10);

}

digitalWrite(blue, 0);

digitalWrite(brown, 1);

digitalWrite(orange, 0);

digitalWrite(yellow, 1);

delay(analogRead(A0) / 4 + 10);

i--;

if (i < 1) break;

{

lcd.setCursor(12, 2);//print out the value of the pushbutton

lcd.print(i--);

}

digitalWrite(blue, 1);

digitalWrite(brown, 0);

digitalWrite(orange, 0);

digitalWrite(yellow, 1);

delay(analogRead(A0) / 4 + 10);

i--;

if (i < 1) break;

{

lcd.setCursor(12, 2);//print out the value of the pushbutton

lcd.print(i--);

}

}

}

void forward(int i) {

{

lcd.setCursor(10, 1);

lcd.print("CW>>>");

}

while (1) {

digitalWrite(blue, 1);

digitalWrite(brown, 0);

digitalWrite(orange, 0);

digitalWrite(yellow, 1);

delay(analogRead(A0) / 4 + 10);

i--;

if (i < 1) break;

{

lcd.setCursor(12, 2);//print out the value of the pushbutton

lcd.print(i--);

}

digitalWrite(blue, 0);

digitalWrite(brown, 1);

digitalWrite(orange, 0);

digitalWrite(yellow, 1);

delay(analogRead(A0) / 4 + 10);

i--;

if (i < 1) break;

{

lcd.setCursor(12, 2);//print out the value of the pushbutton

lcd.print(i--);

}

digitalWrite(blue, 0);

digitalWrite(brown, 1);

digitalWrite(orange, 1);

digitalWrite(yellow, 0);

delay(analogRead(A0) / 4 + 10);

i--;

if (i < 1) break;

{

lcd.setCursor(12, 2);//print out the value of the pushbutton

lcd.print(i--);

}

digitalWrite(blue, 1);

digitalWrite(brown, 0);

digitalWrite(orange, 1);

digitalWrite(yellow, 0);

delay(analogRead(A0) / 4 + 10);

i--;

if (i < 1) break;

{

lcd.setCursor(12, 2);//print out the value of the pushbutton

lcd.print(i--);

}

}

}