Question

b. Copy the text below into your program. /*

* Purpose: Read a 0V-5V value from analog pin A1

* and convert it to a 10-bit (0-1023) number. */

void setup() {

Serial.begin(115200); //set serial comm to 115 kbps }

void loop()

{ int pot_val; //input - potentiometer value

// analogRead() converts 0V-5V to 0-1023 pot_val = analogRead(1);

//read from Analog pin 1 Serial.println(pot_val); //print to serial monitor }

c. Add the function delay() from lab0 to make the readings 1x per second.

d. Write code to display formatted output on the serial monitor as shown below:

Voltage Integer Binary HEX

0.406 83 1010011 53

0.415 85 1010101 55 ...

(ii) Write a formula for converting an integer value (0 to 1023) to an analog voltage, where 0V corresponds to integer 0 and 5V corresponds to integer 1023.

Answer 1

b) The analogRead(pin) function reads the value from the specified analog pin. It returns a 10-bit integer that maps input voltages between 0 and 5 volts to 0 and 1023. More information about the function can be found here: https://www.arduino.cc/reference/en/language/functions/analog-io/analogread/

The original program is:

/*
* Purpose: Read a 0V-5V value from analog pin A1
* and convert it to a 10-bit (0-1023) number.
*/

void setup() {
Serial.begin(115200); // set serial comm to 115 kBaud
}

void loop() {

int pot_val; // input - potentiometer value

// analogRead() converts 0V-5V to 0-1023
pot_val = analogRead(1); // read from Analog pin 1

Serial.println(pot_val); // print to serial monitor
}

c) A delay can be realized by using the delay function. It accepts a single argument, the delay in miliseconds. The program with the added delay functionality:

/*
* Purpose: Read a 0V-5V value from analog pin A1
* and convert it to a 10-bit (0-1023) number.
*/

void setup() {
Serial.begin(115200); // set serial comm to 115 kBaud
}

void loop() {

int pot_val; // input - potentiometer value

// analogRead() converts 0V-5V to 0-1023
pot_val = analogRead(1); // read from Analog pin 1

Serial.println(pot_val); // print to serial monitor

delay(1000);
}

d) We can make use of the second argument of the Serial.print() function to specify the format of the output. More information about the function can be found here: https://www.arduino.cc/en/Serial/Print

/*
* Purpose: Read a 0V-5V value from analog pin A1
* and convert it to a 10-bit (0-1023) number.
*/

void setup() {
Serial.begin(115200); // set serial comm to 115 kBaud
Serial.println("Voltage Integer Binary HEX");
}

void loop() {

int pot_val; // input - potentiometer value

// analogRead() converts 0V-5V to 0-1023
pot_val = analogRead(1); // read from Analog pin 1

Serial.print(pot_val * 5.0 / 1023);
Serial.print("\t");

Serial.print(pot_val);
Serial.print("\t");

Serial.print(pot_val, BIN);
Serial.print("\t");

Serial.println(pot_val, HEX);

delay(1000);
}

(ii)

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