From 87a06ecc655b00ca1e23b82aec20eaf89f7e88e9 Mon Sep 17 00:00:00 2001
From: pcgaldo <info@pcgaldo.com>
Date: Wed, 19 Jun 2024 16:51:43 +0200
Subject: [PATCH] Atualizar tachometer_v1.ino

---
 tachometer_v0.ino => tachometer_v1.ino | 41 +++++++++++++++++++-------
 1 file changed, 30 insertions(+), 11 deletions(-)
 rename tachometer_v0.ino => tachometer_v1.ino (78%)

diff --git a/tachometer_v0.ino b/tachometer_v1.ino
similarity index 78%
rename from tachometer_v0.ino
rename to tachometer_v1.ino
index 88c620c..70ea905 100644
--- a/tachometer_v0.ino
+++ b/tachometer_v1.ino
@@ -39,6 +39,7 @@ 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
+float lastSpeed_m_min = -1; // Variable to store the last speed value
 
 // Constants for encoder and roller
 const int pulsesPerRevolution = 1000; // Pulses per revolution of the encoder
@@ -53,6 +54,14 @@ void setup() {
   lcd.init();
   lcd.backlight();
 
+  // Display fixed text on the LCD
+  lcd.setCursor(2, 0);
+  lcd.print("CONVEYOR SPEED");
+  lcd.setCursor(5, 1);
+  lcd.print("CONTROLLER");
+  lcd.setCursor(5, 2);
+  lcd.print("VELOCIDADE");
+
   // Set up interrupts for encoder signal changes
   attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), ai0, CHANGE);
   attachInterrupt(digitalPinToInterrupt(ENCODER_DT), ai1, CHANGE);
@@ -74,17 +83,17 @@ void loop() {
     // Reset counter for the next measurement
     counter = 0;
     
-    // Display RPM and speed on the LCD
-    lcd.clear();
-    lcd.setCursor(2, 0);
-    lcd.print("CONVEYOR 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");
+    // Display speed on the LCD only if it has changed
+    if (speed_m_min != lastSpeed_m_min) {
+      lcd.setCursor(5, 3);
+      lcd.print("          "); // Clear previous value
+      lcd.setCursor(5, 3);
+      lcd.print(speed_m_min);
+      lcd.print(" m/min");
+
+      // Update the last speed value
+      lastSpeed_m_min = speed_m_min;
+    }
     
     // Update the last time reference
     lastTime = currentTime;
@@ -106,3 +115,13 @@ void ai1() {
     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++;
+  }
+}