Question

Write the coding of Serial Call and Response (handshaking) with ASCII-encoded output in Arduinodroid.

Answer 1

The circuit:

* potentiometers attached to analog inputs 0 and 1

* pushbutton attached to digital I/O 2

int firstSensor = 0 ; // first analog sensor

int secondSensor = 0 ; // second analog sensor

int thirdSensor = 0 ; // digital sensor

int inByte = 0 ; // incoming serial byte

void setup ( ) {

// start serial port at 9600 bps and wait for port to open:

Serial . begin ( 9600 ) ;

while ( ! Serial ) {

; // wait for serial port to connect. Needed for native USB port only

}

pinMode ( 2 , INPUT ) ; // digital sensor is on digital pin 2

establishContact ( ) ; // send a byte to establish contact until receiver responds

}

void loop ( ) {

// if we get a valid byte, read analog ins:

if ( Serial . available ( ) > 0 ) {

// get incoming byte:

inByte = Serial . read ( ) ;

// read first analog input:

firstSensor = analogRead ( A0 ) ;

// read second analog input:

secondSensor = analogRead ( A1 ) ;

// read switch, map it to 0 or 255L

thirdSensor = map ( digitalRead ( 2 ) , 0 , 1 , 0 , 255 ) ;

// send sensor values:

Serial . print ( firstSensor ) ;

Serial . print ( "," ) ;

Serial . print ( secondSensor ) ;

Serial . print ( "," ) ;

Serial . println ( thirdSensor ) ;

}

}

void establishContact ( ) {

while ( Serial . available ( ) <= 0 ) {

Serial . println ( "0,0,0" ) ; // send an initial string

delay ( 300 ) ;

}

}

Answer 2

$\boxed{Explained\:Answer}$

______________________________

int firstSensor = 0;    // first analog sensor

int secondSensor = 0;   // second analog sensor

int thirdSensor = 0;    // digital sensor

int inByte = 0;         // incoming serial byte

void setup()

{

  // start serial port at 9600 bps and wait for port to open:

  Serial.begin(9600);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for Leonardo only

  }

  

  pinMode(2, INPUT);   // digital sensor is on digital pin 2

  establishContact();  // send a byte to establish contact until receiver responds 

}