Question

Task: Write an Arduino code to take voltage measurements across a potentiometer in a voltage divider circuit such as thee one built in class. Your code must also use the voltage divider equation to determine the resistance across the potentiometer. The code will record the Voltage and the Potentiometer Resistance measurements in the Serial Monitor. Assume R1 = 47 k0. The Serial Monitor window must give out the Voltage and Resistance values in different tabs, making a "table" such as this one: /dev/tty. us bmodem4 11 Send tenp. ( 30.00 rH (K) 26.00 26.00 30.00 26.00 30.00 26.00 30.00 26.00 30.00 26.88 26.00 26.00 26.00 30.00 30.00 30.00 Autoscroll No line ending 9600 baud Figure 1. Example of simple table with two tabs in Arduino Serial Monitor The tittles for the tabs, e.g. "Volt (V)" and "Pot Res (Ohm)", must be shown only once in the Serial Monitor, followed by the changing values of the variables. Use a delay of 1 second between readings.

Answer 1

/* Analog Read to LED
* ------------------
*
* turns on and off a light emitting diode(LED) connected to digital
* pin 13. The amount of time the LED will be on and off depends on
* the value obtained by analogRead(). In the easiest case we connect
* a potentiometer to analog pin 2.
*
* Created 1 December 2005
* copyleft 2005 DojoDave <http://www.0j0.org>
* http://arduino.berlios.de
*
*/

int potPin = 2; // select the input pin for the potentiometer
int ledPin = 13; // select the pin for the LED
int val = 0; // variable to store the value coming from the sensor

void setup() {
pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
}

void loop() {
val = analogRead(potPin); // read the value from the sensor
digitalWrite(ledPin, HIGH); // turn the ledPin on
delay(val); // stop the program for some time
digitalWrite(ledPin, LOW); // turn the ledPin off
delay(val); // stop the program for some time
}

*/

// 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 / 1023.0);
// print out the value you read:
Serial.println(voltage);
}