android serial usb arduino hiccups?

vagos21

Hello everyone, i've been working with processing and the android mode for a few days now, and i decided to do this little sensors report when i plug in my android phone to my arduino. i set up the manifest with the vendor IDs and everything and it all works fine but...

even though the arduino Tx lights up continuously (sends data all the time) the processing software looks like it's getting data for a couple of seconds, then looks completely idle for 10 seconds, then takes data again, then no comminucation again... i know the app is not freezing because i'm doing a sliding graph, which happily slides along. any idea what could be causing this hiccup? a buffer overrun?

to be honest i'm trying to make something like a semi-fast DMM, and right now the arduino sends 2 values every 100ms, @38400 baud. is this too fast for the app to handle?

forgive me for the following, but i can't find a code format button...? :D

this is the arduino code:

 void setup() {
   Serial.begin(38400);
   pinMode(A0,INPUT);
   pinMode(A1,INPUT);
}

void loop() {
  Serial.print(analogRead(A0));
  Serial.print(";");
  Serial.println(analogRead(A1));
  delay(150);
}

and the android side:

import io.inventit.processing.android.serial.*; //ANDROID

//SERIAL PORT
Serial myPort;      //thermostat serial port
String inString=""; //input string from serial port

//FONTS
PFont dateFont;           //date font

//REALTIME DATA
float v1 = 0.0;  //voltage1
float v2 = 0.0;  //voltage2

//COLORS
color activeText = color(182, 230, 244);
color inactiveText = color(60, 60, 60);

//BUTTONS
transButton resetBtn = new transButton( width/2, height-50, 200, 50, "Reset");


void setup() {
  fullScreen();
  orientation(LANDSCAPE);
  frameRate(200);

  //init fonts
  dateFont = createFont("WalkwayBold.ttf", 60);

  //init USB serial port
  myPort = new Serial(this, Serial.list(this)[0], 38400); //ANDROID
  myPort.bufferUntil(10);
}

//===========INCOMING DATA FROM THERMOSTAT=============
void serialEvent(Serial myPort) { 
  try {
    inString = myPort.readString();
    String[] list = split(inString, ';');
    v1 = float(list[0])/1024.0;
    v2 = float(list[1])/1024.0;
  }
  catch(RuntimeException e) {
    e.printStackTrace();
  }
}

//===============MAIN LOOP===================
void draw() {
  //timeNow = millis();
  drawMainScreen();
}


//===============DRAWING LOOP===================
void drawMainScreen() {
  background(36,93,142);

  //voltage 1
  fill(255);
  textFont(dateFont);
  textAlign(LEFT, CENTER);
  text("v1: " + v1 + "V", 50, 20);

  //voltage 2
  fill(255);
  textFont(dateFont);
  textAlign(LEFT, CENTER);
  text("v2: " + v2 + "V", 50, 80);

  //raw serial input
  fill(255);
  textFont(dateFont);
  textAlign(CENTER, TOP);
  text("raw: " + inString, 700, 20);

noel

I am interested in the inventit lib, but without formating it´s hard to read. I saw that you clicked the code button and then pasted your code in between. However you firstly have to paste your code, then select only this code and hit the code button. Also please don´t use concatenation. Like:

This is the arduino code:

void setup() {
  Serial.begin(38400);
  pinMode(A0,INPUT);
  pinMode(A1,INPUT);
}

void loop() {
  Serial.print(analogRead(A0));
  Serial.print(";");
  Serial.println(analogRead(A1));
  delay(150);
}

noel

I found the source here But unfortunately, it only works on Android 5.0 or later since it uses Android USB Host API.