lesson53-55 moved

lessons/lesson53-55.cpp

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+// https://www.youtube.com/watch?v=M-UKXCUI0rE&list=PLGs0VKk2DiYw-L-RibttcvK-WBZm8WLEP&index=53
+// https://www.youtube.com/watch?v=BTMMNsL0_b0&list=PLGs0VKk2DiYw-L-RibttcvK-WBZm8WLEP&index=54
+// https://www.youtube.com/watch?v=2hwrDSVHQ-E&list=PLGs0VKk2DiYw-L-RibttcvK-WBZm8WLEP&index=55
+
+
+#include <Arduino.h>
+
+int trigPin = 12;
+int echoPin = 11;
+int pingTravleTime;
+float distance;
+const int pulsTime = 40; // uS
+const float pingTimeToDistance = 0.017; // uS to cm, travletime[s] * 340 m/s / 2
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(9600);
+  pinMode(trigPin, OUTPUT);
+  pinMode(echoPin, INPUT);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  digitalWrite(trigPin, LOW);
+  delayMicroseconds(pulsTime);
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(pulsTime);
+  digitalWrite(trigPin, LOW);
+  pingTravleTime = pulseIn(echoPin, HIGH);
+  delay(25);
+  Serial.print("Ping Time: ");
+  Serial.print(pingTravleTime);
+
+  distance = pingTravleTime * pingTimeToDistance;
+  Serial.print(" Distance: ");
+  Serial.print(distance);
+  Serial.println(" cm");
+
+}