how to get string value after while looping

Using Arduino Programming Questions
1

hi, before im asking, im sorry for my bad english, i've searching for my solution and still don't get solution.

this is my example code for my training

#include <SoftwareSerial.h>

SoftwareSerial mySerial(11, 10); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  mySerial.begin(9600);
  while (!Serial) 
  {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);

}

void loop() 
{
  int x = 0;
  String var_baca;
  String var_ahir;

  while(mySerial.available())
  {
    var_baca = mySerial.readStringUntil('\r');
    Serial.print(var_baca);
  }

  while(digitalRead(2) == LOW)
  {
    x++;
    Serial.print("Mengirim : ");
    Serial.println(x);
    mySerial.print(x);
  }

  if(digitalRead(3) == LOW)
  {
  Serial.print("Hasil Akhir : ");
  Serial.println(var_baca);
  }
}

this is my description :

  1. i'm using 2 arduino for simulation 2 device serial communication,and using push button for every command.
  2. if digitalread 2 = low, my arduino send a value (x) to other arduino. On the other hand, if my arduino get a value from serial pin, my arduino will print it.

My problem is, how to get string value "var_baca" after while looping complete. because, if i'm running that code and digitalread 3 = low, "var_baca" not showing any value.

thank you for your tim and helping :smiley:

2

Do you see any problem with putting a separate copy of the if(digitalRead(3) == LOW) loop inside the while loop to handle that case?

3

Change this

while(digitalRead(2) == LOW)

to

if (digitalRead(2) == LOW)

And have a look at the examples in Serial Input Basics - simple reliable ways to receive data.

...R

4

thank you, i'll try to learn from that tutorial :smiley:

5