Arduino uno User Manual

The callback function receives an object containing all information about the
connection. The statement above prints a text representation of the serial
connection object that has been created:
Object {
bitrate: 38400
bufferSize: 4096
connectionId: 13
ctsFlowControl: false
dataBits: "eight"
name: ""
parityBit: "no"
paused: false
persistent: false
receiveTimeout: 0
sendTimeout: 0
stopBits: "one"
}
This object contains all properties you’d expect in an object representing a
serial connection. It contains properties for the parity bit and stop bit settings.
One of its most important properties is connectionId . If the call to connect was
successful, its value is greater than zero.
In a next step, you can add a receive listener that gets called whenever data
arrives at the serial port:
var listener = function(r) { console.log(r.data); }
chrome.serial.onReceive.addListener(listener)
This listener outputs the data it receives on the console. Its output looks like
this:
ArrayBuffer {}
ArrayBuffer {}
ArrayBuffer {}
...
This probably isn’t what you expected. The problem is that the Chrome Serial
API stores the data it receives in an ArrayBuffer object. This is necessary because
you can transmit not only textual, but also binary data over a serial connec-
tion. JavaScript doesn’t support binary data out of the box, so you have to
use a few helper classes, such as ArrayBuffer .
Using the following function, you can turn the content of an ArrayBuffer object
into a JavaScript string:
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Arduino uno Specifications

General

Form factor	Arduino
Certification	RoHS, FC, CE
Processor model	-
Processor frequency	- MHz
Microcontroller model	ATmega328
Microcontroller frequency	16 MHz
DC input voltage	7-12 V
Operating voltage	5 V
DC current per I/O pin	40 mA
Flash memory	0.032 MB
Maximum internal memory	- GB
SRAM (Static Random Access Memory)	2 KB
EEPROM (Electrically Erasable Programmable Read-Only Memory)	1 KB
Wi-Fi	No
Number of analog I/O pins	6
Number of digital I/O pins	14

Weight and Dimensions

Board dimensions	53.4 x 68.6 mm