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tachometer_v0.ino

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+/*
+  Copyright (C) 2024, Pablo César Galdo Regueiro.
+  info.wokwi(at)pcgaldo.com
+
+  Project in editing process. Operation may be limited.
+
+  License
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>
+*/
+
+#include <LiquidCrystal_I2C.h>
+
+// LCD configuration
+#define I2C_ADDR    0x3F
+#define LCD_COLUMNS 20
+#define LCD_LINES   4
+
+LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
+
+// Encoder input pins
+#define ENCODER_CLK 2
+#define ENCODER_DT  3
+
+// Global variables
+volatile long counter = 0; // Counter for encoder pulses
+unsigned long lastTime = 0; // To store the last time when RPM was calculated
+unsigned long currentTime = 0; // To store the current time
+float rpm = 0; // Variable to store the RPM value
+float speed_m_min = 0; // Variable to store the speed in meters per minute
+
+// Constants for encoder and roller
+const int pulsesPerRevolution = 1000; // Pulses per revolution of the encoder
+const float rollerDiameter = 100.0;  // Diameter of the roller in mm
+
+void setup() {
+  // Set up encoder pins as input with internal pull-up resistors
+  pinMode(ENCODER_CLK, INPUT_PULLUP);
+  pinMode(ENCODER_DT, INPUT_PULLUP);
+
+  // Initialize the LCD
+  lcd.init();
+  lcd.backlight();
+
+  // Set up interrupts for encoder signal changes
+  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), ai0, CHANGE);
+  attachInterrupt(digitalPinToInterrupt(ENCODER_DT), ai1, CHANGE);
+
+  // Initialize the time reference
+  lastTime = millis();
+}
+
+void loop() {
+  // Calculate RPM and speed every second
+  currentTime = millis();
+  if (currentTime - lastTime >= 1000) {
+    // Calculate RPM: (counter * 60) / (pulses per revolution)
+    rpm = (counter * 60.0) / pulsesPerRevolution;
+    
+    // Calculate speed in m/min: (RPM * π * diameter) / 1000
+    speed_m_min = (rpm * 3.14159 * rollerDiameter) / 1000.0;
+    
+    // Reset counter for the next measurement
+    counter = 0;
+    
+    // Display RPM and speed on the LCD
+    lcd.clear();
+    lcd.setCursor(4, 0);
+    lcd.print("EGURKO SPEED");
+    lcd.setCursor(5, 1);
+    lcd.print("CONTROLLER");
+    lcd.setCursor(5, 2);
+    lcd.print("VELOCIDADE");
+    lcd.setCursor(5, 3);
+    lcd.print(speed_m_min);
+    lcd.print(" m/min");
+    
+    // Update the last time reference
+    lastTime = currentTime;
+  }
+}
+
+// Interrupt service routine for encoder channel A
+void ai0() {
+  // If both signals are the same, the encoder is rotating forward
+  if (digitalRead(ENCODER_CLK) == digitalRead(ENCODER_DT)) {
+    counter++;
+  }
+}
+
+// Interrupt service routine for encoder channel B
+void ai1() {
+  // If both signals are different, the encoder is rotating forward
+  if (digitalRead(ENCODER_CLK) != digitalRead(ENCODER_DT)) {
+    counter++;
+  }
+}