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ATMEGA_VOLTMETRE/ATMEGA_VOLTMETRE.ino

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+/*
+  *
+  * Udemy.com
+  * Building an Arduino DC Voltmeter
+  *
+  */
+ 
+ float vPow = 4.7;
+ float r1 = 68000;
+ float r2 = 680000;
+ int speed = 120;
+ void setup() {
+   
+   pinMode(3, OUTPUT);
+   analogWrite(3, speed);
+  
+   Serial.begin(9600);
+   
+   // Send ANSI terminal codes
+   Serial.print("\x1B");
+   Serial.print("[2J");
+   Serial.print("\x1B");
+   Serial.println("[H");
+   // End ANSI terminal codes
+   
+   Serial.println("--------------------");
+   Serial.println("DC VOLTMETER");
+   Serial.print("Maximum Voltage: ");
+   Serial.print((int)(vPow / (r2 / (r1 + r2))));
+   Serial.println("V");
+   Serial.println("--------------------");
+   Serial.println("");
+   
+   delay(2000);
+ }
+ 
+ void loop() {
+   float v = (analogRead(A0)* vPow) / 1024.0;
+   float v2 = v / (r2 / (r1 + r2));
+   
+   // Send ANSI terminal codes
+   //Serial.print("\x1B");
+   //Serial.print("[1A ");
+   // End ANSI terminal codes
+   
+   Serial.print(analogRead(A0));
+   Serial.print(" ");
+   Serial.println(v2);
+   
+
+    // First we check to see if incoming data is available:
+
+    while (Serial.available() > 0)
+    {
+      // If it is, we'll use parseInt() to pull out any numbers:
+
+      speed = Serial.parseInt();
+
+      // Because analogWrite() only works with numbers from
+      // 0 to 255, we'll be sure the input is in that range:
+
+      speed = constrain(speed, 0, 255);
+
+      // We'll print out a message to let you know that the
+      // number was received:
+
+      Serial.print("Setting speed to ");
+      Serial.println(speed);
+
+      // And finally, we'll set the speed of the motor!
+
+      analogWrite(3, speed);
+    }
+  
+   
+ }