Serial.read and Serial.write i have a little problem

Projects Programming
1

Hey guys i am have some problems here..

In android studio i write this..

driver.setBaudRate(9600);
byte buffer[] = new byte[16];
driver.write(buffer,1000);

What should i write here in Arduino ?

incommingByte = Serial.read();
if(incommingByte == ......... )
digitalWrite(led, HIGH);

I do not know how to make a connection between this two..
I mean i want to send from android some data and arduino to interpret that data..

2

Ok this code is working..

Arduino

incomingByte = Serial.read();
if(Serial.peek() != -1){
digitalWrite(ledPin4,HIGH);
delay(1000);

But help me understand how bytes work..
I want to make something like..
if the phone sends "1" arduino turn led1 on
if sends "0" (the phone), arduino opens led2
and so on..

3

Why not check (Serial.available()) before reading?

4

I am new i don't know what should i do..
I think peek and available are the same ?
Any way, how can i differenciate the signals sent? And what should android app send..

5

Android could send single characters, same as received from Serial Monitor, then processing is simple, and any non-characters can be ignored:

if (Serial.available()>0){
incomingByte = Serial.read();
switchCase (incomingByte){
case '0':
// code
break;
case '1':
// code
break;
case '2':
// code
break;
case '3':
// code
break;
case '4':
// code
break;
case '5':
// code
break;
case '6':
// code
break;
case '7':
// code
break;
case '8':
// code
break;
case '9':
// code
break;
case 'a':
// code
break;
case 'b':
// code
break;
:
:
case 'y':
// code
break;
case 'z':
// code
break;
case 'A':
// code
break;
case 'B':
// code
break;
:
:
case 'Y':
// code
break;
case 'Z':
// code
break;
} // end switch
} // end serial avail check
6

Look at the examples in serial input basics. One of them probably does what you want.

...R

7

I think peek and available are the same ?

Why would they be the same?
Why not look at the reference?

8

AWOL:
Why would they be the same?
Why not look at the reference?

Ok that made me understand something..

Thank you guys, you showed me another way, but i want to ask you how can i send a specified byte

i mean byte hello ="something" An example of "something" ?

9

Check the link in Robin2's post. It's a very good tute.

--Michael

10 
byte hello ="something"

In what universe can you store 10 characters in ONE byte?

11

Very simple serial test code:

// zoomkat 8-6-10 serial I/O string test
// type a string in serial monitor. then send or enter
// for IDE 0019 and later

int ledPin = 13;
String readString;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT); 
  Serial.println("serial on/off test 0021"); // so I can keep track
}

void loop() {

  while (Serial.available()) {
    delay(3);  
    char c = Serial.read();
    readString += c; 
  }

  if (readString.length() >0) {
    Serial.println(readString);

    if (readString == "on")     
    {
      digitalWrite(ledPin, HIGH);
      Serial.println("LED ON");
    }
    if (readString == "off")
    {
      digitalWrite(ledPin, LOW);
      Serial.println("LED OFF");
    }
    readString="";
  } 
}