From eab381356e562f5e408a9fbfe0252e0fe2017157 Mon Sep 17 00:00:00 2001
From: Tom Nordal <tnordal@gmail.com>
Date: Wed, 26 Jun 2024 22:12:33 +0200
Subject: [PATCH] lesson 61 finished

---
 Sensors/src/main.cpp | 60 +++++++++++++++++++++++++++++---------------
 1 file changed, 40 insertions(+), 20 deletions(-)

diff --git a/Sensors/src/main.cpp b/Sensors/src/main.cpp
index eeaef15..200d86b 100644
--- a/Sensors/src/main.cpp
+++ b/Sensors/src/main.cpp
@@ -1,4 +1,5 @@
-// https://www.youtube.com/watch?v=A6kEroT-g2o&list=PLGs0VKk2DiYw-L-RibttcvK-WBZm8WLEP&index=60
+// Lesson 61. Ultrasonic Sensor with LCD Display
+// https://www.youtube.com/watch?v=nC2CDaqJomA
 
 
 #include <Arduino.h>
@@ -7,21 +8,27 @@
 const int rs = 7, en = 8, d4 = 9, d5 = 10, d6 = 11, d7 = 12;
 LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
 
-
 int trigPin = 2;
 int echoPin = 3;
 int pingTravleTime;
 float distance;
-const int pulsTime = 40; // uS
+const int pulsTime = 40;                // uS
 const float pingTimeToDistance = 0.017; // uS to cm, travletime[s] * 340 m/s / 2
 
+int numReadings = 50;
+float averageMeasurements;
+float averageTime;
+float bucketDist = 0.0;
+float bucketTime = 0.0;
+
 int buttonPin = A0;
 int buttomState;
 
 int setTime = 500;
 int dt = 1000;
 
-void setup() {
+void setup()
+{
   // put your setup code here, to run once:
   Serial.begin(9600);
   Serial.println("Measurring Distance");
@@ -37,7 +44,8 @@ void setup() {
   digitalWrite(buttonPin, HIGH);
 }
 
-void loop() {
+void loop()
+{
   // put your main code here, to run repeatedly
   buttomState = digitalRead(buttonPin);
   while (buttomState == HIGH)
@@ -45,38 +53,50 @@ void loop() {
     lcd.setCursor(0, 0);
     lcd.print("Place the Target");
     lcd.setCursor(0, 1);
-    lcd.print("Press the Button");    
+    lcd.print("Press the Button");
     buttomState = digitalRead(buttonPin);
   }
+
   {
-    digitalWrite(trigPin, LOW);
-    delayMicroseconds(pulsTime);
-    digitalWrite(trigPin, HIGH);
-    delayMicroseconds(pulsTime);
-    digitalWrite(trigPin, LOW);
-    pingTravleTime = pulseIn(echoPin, HIGH);
-    delay(25);
+    bucketDist = 0.0;
+    bucketTime = 0.0;
+
+    for (int i = 0; i < numReadings; i++)
+    {
+      digitalWrite(trigPin, LOW);
+      delayMicroseconds(pulsTime);
+      digitalWrite(trigPin, HIGH);
+      delayMicroseconds(pulsTime);
+      digitalWrite(trigPin, LOW);
+      pingTravleTime = pulseIn(echoPin, HIGH);
+      delay(25);
 
-    distance = pingTravleTime * pingTimeToDistance; // Travel time to distance in cm
+      distance = pingTravleTime * pingTimeToDistance; // Travel time to distance in cm
+
+      bucketDist = bucketDist + distance;
+      bucketTime = bucketTime + pingTravleTime;
+
+    }
+
+    averageMeasurements = bucketDist / numReadings;
+    averageTime = bucketTime / numReadings;
 
     Serial.print("Ping Time and Distance:");
     Serial.print("Ping Time: ");
-    Serial.print(pingTravleTime);
+    Serial.print(averageTime);
     Serial.print(" Distance: ");
-    Serial.print(distance);
+    Serial.print(averageMeasurements);
     Serial.println(" cm");
 
     // Display on LCD
     lcd.clear();
     lcd.setCursor(0, 0);
     lcd.print("Ping Time: ");
-    lcd.print(pingTravleTime);
+    lcd.print(averageTime);
     lcd.print("us");
     lcd.setCursor(0, 1);
     lcd.print("Distance: ");
-    lcd.print(distance);
+    lcd.print(averageMeasurements);
     lcd.print("cm");
   }
-  
-
 }