Making Things Talk

HOW TO LOCATE (ALMOST) ANYTHING 289

AREF

GND

D13

D12

D11/PWM2

D10/PWM1

D9/PWM0

D8

D7

D6

D5

D4

D3

D2

Digital1/TX

Digital0/RX

+5V

Gnd

Gnd

+9V

Analog0

A1

A2

A3

A4

A5

Arduino

Module

ADXL320

Accelerometer

ST

Z

Y

X

GND

+V

Figure 8-11

ADXL320 acceler-

ometer connected to

an Arduino Mini 04

module. The detail

photo shows the board

with the accelerometer

removed to show the

wiring underneath.

Making_Things_Talk.indb 289 11/13/09 4:56 PM

290 MAKING THINGS TALK

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void loop() {

// read 2 channels of the accelerometer:

for (int i = 0; i < 2; i++) {

accelerometer[i] = analogRead(i);

// delay to allow analog-to-digital converter to settle:

delay(10);

}

// if there's serial data in, print sensor values out:

if (Serial.available() > 0) {

// read incoming data to clear serial input buffer:

int inByte = Serial.read();

for (int i = 0; i < 2; i++) {

// values as ASCII strings:

Serial.print(accelerometer[i], DEC);

// print commas between values:

Serial.print(",");

}

// print \r and \n after values are sent:

Serial.println();

}

}

This sketch

uses a call-and-

response serial method, so you won’t

see any data coming out unless you

send it a character serially. You can test

it using your favorite serial terminal

program. With the serial port open in

the serial terminal ...