#include <LiquidCrystal.
h>
#include <Key.h>
#include <Keypad.h>
//#include <LiquidCrystal_I2C.h>
const int comparatorPositivePin = A5;
/*#include <Keypad.h>
#include <LiquidCrystal_I2C.h>*/
const int rs = 2, en = 3, d4 = 10, d5 = 11, d6 = 12, d7 = 13;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
//Motor A
const int motorDirectionPin = A3;
const int motorSpeedPin = A2;
//LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x3F for a 16 chars
and 2 line display
#define codeLength 5
//Declaration of Global Variables
char Code[codeLength];
byte keycount = 0;
char customKey;
String instr = "";
int enterBtn = 0, changeFreqBtn = 0, cancelBtn = 0, signalState = 0;
long int rpm = 0;
long int Hz = 0;
long int lastRpm = 0; // Variable to store the last entered RPM
const byte ROWS = 4;
const byte COLS = 3;
char hexaKeys[ROWS][COLS] = {
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'},
{'-', '0', '+'}
};
byte rowPins[ROWS] = {5, 6, 7, 8};
byte colPins[COLS] = {0, 1, 4};
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
void setup(){
Serial.begin(9600);
lcd.begin(16, 2);
lcd.clear();
//lcd.backlight(); // Make sure backlight is on
lcd.setCursor(4,0);
lcd.print("Welcome!");
//lcd.setCursor(0,1);
//lcd.print("Dr. Prajit Nandi");
delay(3000);
lcd.clear();
delay(1000);
lcd.setCursor(1,0);
lcd.print("Stroboscope is");
lcd.setCursor(5,1);
lcd.print("ready!");
delay(3000);
lcd.clear();
deftxt();
pinMode(9, OUTPUT);
// initialize the pushbutton pin 11,10,12 as an input:
pinMode(A0, INPUT);
pinMode(A1, INPUT);
// pinMode(A2, INPUT);
pinMode(motorDirectionPin, OUTPUT);
pinMode(motorSpeedPin, OUTPUT);
}
void loop(){
//Stroboscope LED blinking
if (signalState == 1){
float y = 60000.0 / rpm;
digitalWrite(9, HIGH);
delay(y);
digitalWrite(9, LOW);
delay(y);
}
// Action when the ENTER pushbutton is pressed.
int enterBtn = analogRead(A0);
int threshold = 500; // Adjust this threshold as needed
// Check if the analog reading exceeds the threshold
if (enterBtn > threshold) {
// Button pressed, execute the following actions
digitalWrite(9, HIGH); // Turn on the LED
long int b = instr.toInt();
if (b == 0){
lcd.clear();
deftxt();
return;
}
int z = keycount;
z = 11 - z;
lcd.clear();
delay(100);
deftxt();
lcd.setCursor(z, 0);
lcd.print(b);
rpm = b;
Hz = b / 60;
int a = 0, y = Hz;
while (y != 0){
y = y / 10;
a++;
}
a = 11 - a;
lcd.setCursor(a, 1);
lcd.print(Hz);
delay(50);
Serial.print(rpm);
Serial.print(",");
Serial.print(b);
Serial.print(",");
Serial.println(Hz);
signalState = 1;
}
// Action when the CANCEL pushbutton is pressed.
int changeFreqBtn = analogRead(A1);
if (changeFreqBtn > threshold) {
// Button pressed, execute the following actions
signalState = 0;
lcd.setCursor(0, 0);
lcd.print(" rpm");
clearMem();
deftxt();
}
// Action when the Change frequency is pressed.
// int cancelBtn = analogRead(A2);
// if (cancelBtn > threshold) {
// // Button pressed, execute the following actions
// lcd.clear();
// lcd.setCursor(0, 0);
// lcd.print("Last RPM: ");
// lcd.print(lastRpm); // Display the last entered RPM
// instr = String(lastRpm); // Restore the last entered frequency
// keycount = instr.length(); // Set the keycount to the length of the last
entered frequency
// deftxt();
// return;
// }
// Keypad press detect
customKey = customKeypad.getKey();
// Action on - button detect
if (customKey == '-'){
int a = instr.toInt();
if (a <= 0){
error();
delay(1000);
lcd.clear();
deftxt();
return;
}
a--;
rpm++;
instr = String(a);
keycount--;
rpmValue();
}
// Action on + button detect
if (customKey == '+'){
int a = instr.toInt();
a++;
rpm++;
instr = String(a);
keycount--;
rpmValue();
}
// Map the RPM to the PWM range (0-255 corresponds to 0-5V)
int pwmValue = map(rpm, 0, 60000, 0, 255);
// Write the PWM value to the comparator's positive terminal
analogWrite(comparatorPositivePin, pwmValue);
//Action on number key detect
if(customKey){
digitalWrite(9, LOW);
signalState = 0;
numKey();
}
// Read the comparator output
int comparatorOutput = analogRead(A4);
// Map the comparator output to the RPM range
long rpm2 = map(comparatorOutput, 0, 1023, 0, 60000);
// Map the RPM to the PWM range
int pwmValue2 = map(rpm2, 0, 60000, 0, 255);
// Control the motor speed
analogWrite(motorSpeedPin, pwmValue2);
// Control the motor direction
digitalWrite(motorDirectionPin, HIGH);
//Action on more than 5 digit input
if(keycount>codeLength){
error();
memset(Code, 0, sizeof(Code));
keycount = 0;
instr = "";
delay(2000);
lcd.clear();
rpm = 0;
deftxt();
}
}
void deftxt(){ //Default text to show in LCD
lcd.clear();
lcd.setCursor(10,0);
lcd.print("0 rpm");
lcd.setCursor(10,1);
lcd.print("0 Hz");
return;
}
bool numKey(){
Code[keycount]=customKey;
instr += customKey;
rpmValue();
Serial.println(instr);
//Serial.println(Code[keycount]);
//lcd.print(Code[keycount]);
//Serial.println(instr.length()); //To check in case of 0 and - btn
keycount++;
delay(60);
}
void rpmValue(){ //char conversion to int
lcd.setCursor(0,0);
lcd.print(" rpm");
long int a,z;
a = (instr.toInt());
z = 10-keycount;
lcd.setCursor(z,0);
lcd.print(a);
}
void error(){ //Action on error detect
lcd.clear();
Serial.println("ERR");
lcd.setCursor(5,0);
lcd.print("Error!");
lcd.setCursor(1,1);
lcd.print("Limit Exceeded");
}
void clearMem(){
//lcd.setCursor(0,0);
//lcd.print(" rpm");
memset(Code, 0, sizeof(Code));
keycount = 0;
instr = "";
}
