Update file week05.md

docs/assignments/week05.md

@@ -98,6 +98,71 @@ Different from digital circuit, analog signals have continuous electrical signal
 
 ## **ARDUINO**
 
+
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+		
+Easiest Code for Analog Read:
+
+        // the setup routine runs once when you press reset:
+            void setup() {
+        // initialize serial communication at 9600 bits per second:
+        Serial.begin(9600);
+        }
+
+            // the loop routine runs over and over again forever:
+            void loop() {
+            // read the input on analog pin 0:
+            int sensorValue = analogRead(A0);
+            // print out the value you read:
+            Serial.println(sensorValue);
+            delay(100);  // delay in between reads for stability
+            }
+Modified Resistance Measurement Circuit (with a 9.5k ohm resistor and with custom lower and upper resistance range)
+
+    /*
+    Resistance Measurement - www.circuits4you.com
+    Reads an analog input on pin 0, converts it to resistance, and prints the result to the serial monitor.
+      Using a 9,5k ohm resistor as known resistor
+    */
+    int ledPin = 5;  // LED connected to digital pin 9
+
+        int lowerBoundResistance = 500;
+        int upperBoundResistance = 1500;
+
+        // the setup routine runs once when you press reset:
+        void setup() {
+        // initialize serial communication at 9600 bits per second:
+        Serial.begin(9600);
+        }
+
+        // the loop routine runs over and over again forever:
+        void loop() {
+        // read the input on analog pin 0:
+        int sensorValue = analogRead(A0);
+
+            // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
+            float voltage = sensorValue * (5.0 / 1024.0);
+
+            int resistorvalue = 9500; 
+            float I = voltage / resistorvalue;
+            float VRx = 5 - voltage;
+            float Rx = VRx / I;
+            Rx = (5 - voltage) / I;
+
+            int mappedValue = map(Rx, lowerBoundResistance, upperBoundResistance, 0, 255);
+            mappedValue = constrain(mappedValue, 0, 255);
+
+        // print out the value you read:
+        Serial.print("Resistance:");
+         Serial.print(Rx);
+         Serial.print(" Ohms");
+         Serial.print(" and mapped value is ");
+         Serial.println(mappedValue);
+        analogWrite(ledPin, mappedValue);
+         delay(100);
+        }
+		
+
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 ## **TOOLS**