More Fun with Networking Arduinos
Wearables and e-textiles are getting more and more popular, and they’re still a good
way to impress your colleagues and friends. Different types of interactive T-shirts are
available in every well-stocked geek shop. Some of them show the current Wi-Fi
strength, while others come with a full-blown built-in electronic rock guitar.
With an Arduino LilyPad,
a
a Bluetooth dongle, and an Android phone, you can build
a T-shirt that displays the current number of unread emails in your inbox.
b
Not only can you show the number of unread email messages, you can also use the
LilyPad and an XBee module to teach children important information about bees and
their behavior.
c
a.
http://arduino.cc/en/Main/ArduinoBoardLilyPad
b.
http://blog.makezine.com/2010/03/30/email-counting-t-shirt/
c.
http://www.instructables.com/id/Interactive-Bee-Game/
Ethernet/TimeServerDnsDhcp/TimeServerDnsDhcp.ino
#include <SPI.h>
Line 1
#include <Ethernet.h>
-
-
const unsigned int BAUD_RATE = 9600;
-
const unsigned int DAYTIME_PORT = 13;
5
-
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
-
char* time_server = "time.nist.gov";
-
EthernetClient client;
-
10
void setup() {
-
Serial.begin(BAUD_RATE);
-
if (Ethernet.begin(mac) == 0) {
-
for (;;) {
-
Serial.println("Could not obtain an IP address using DHCP.");
15
delay(1000);
-
}
-
} else {
-
print_ip_address(Ethernet.localIP());
-
}
20
}
-
-
-
void loop() {
-
delay(1000);
25
Serial.print("Connecting...");
-
if (client.connect(time_server, DAYTIME_PORT) <= 0) {
-
Serial.println("connection failed.");
-
} else {
-
Serial.println("connected.");
30
Chapter 10. Networking with Arduino • 178
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