Sunday, 14 April 2013 21:10
Arduino读取键盘
这里提供两种方式从Arduino读取键盘。第一种方式是使用矩阵式（Matrix）键盘，另一种方式是使用PS2键盘。
矩阵键盘（Matrix keypad）
首先必须安装Arduino Keypad键盘库（Keypad library），Arduino Keypad键盘库可以从Arduino Playground下载。Arduino Keypad键盘库让你读取矩阵式键盘而不用编写复杂的代码，此键盘库可以读取3x4， 4x4以及各种矩阵结构的键盘。
首先必须安装Arduino Keypad键盘库（Keypad library），Arduino Keypad键盘库可以从Arduino Playground下载。Arduino Keypad键盘库让你读取矩阵式键盘而不用编写复杂的代码，此键盘库可以读取3x4， 4x4以及各种矩阵结构的键盘。
Published in
电子与电脑
Saturday, 13 April 2013 16:47
Arduino与Stronglink SL018 RFID模块
眾多RFID模块中，Stronglink SL018是我找到最便宜的模块且支持读取及写入。SL018 使用了I2C接口（只使用两条信号线）与外界沟通，支持的RFID卡包括MIFARE Classic 1K， MIFARE Classic 4K 和 MIFARE Ultralight，频率则是13.56MHz。以下是SL018规则说明：
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Model
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MIFARE Module SL018
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Frequency
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13.56MHz
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Protocol
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ISO14443A
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Tag supported
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Ultralight, NTAG203, MIFARE Mini, MIFARE™ Classic 1K, MIFARE™ Classic 4K, FM11RF08
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Interface
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I2C
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Supply voltage
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4.4 - 7.0VDC
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Dimension
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65 × 45 mm
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Published in
电子与电脑
Sunday, 09 December 2012 15:27
Changing the Tiny Arduino clock between 1MHz and 8MHz
This article shows how to make a simplest & cheapest Arduino. The clock speed is running at 1MHz even though you select 8MHz internal clock. This is because the Div8 fuses bit of the new ATtiny85 is enabled by default, therefore 8MHz divided by 8 is 1MHz. In order to resolve this problem, we nee to disable the Div8 fuse bit using a AVR programmer.
Here I provide a method to switch the Tiny Arduino clock speed between 1MHz and 8Mhz by using a Arduino Duemilanove as an ISP programmer.
Published in
Tutorials
Sunday, 09 December 2012 13:56
Simplest and Cheapest Arduino
Here we use a ATTiny85 (can be ATTiny45, ATTiny44) to make an Arduino just for US3.00, so we name it as Tiny Arduino.
Tiny Arduino have only eight pins as shown in figure above, Pin4 is ground (Gnd), Pin8 is 5V (Vcc), Pin1 is Reset, Pin2 and Pin3 originally used to connecting the Crystal. In order to utilize all the IO, the internal oscillator (RC Oscillator) is used to replace the external clock which require a crystal. Therefore the Tiny Arduino is now come with five IO. Below shows the Arduino IO functions.
- There are five IO, each IO can be Input or Output
- Among the five IO, two of the IO can perform as PWM
- Among the five IO, three of the IO can perform as Analog Input
I2C may require to extend the features of Tiny Arduino.
Published in
Blog
Thursday, 06 December 2012 16:33
最简单又最便宜的Arduino
这里我们打造一个US3.00的Arduino，只是使用一个ATTiny85(ATTiny45，ATTiny44都可以)，所以称它为Tiny Arduino。
Tiny Arduino只有八个接脚（Pin)，Pin4为接地(Gnd)，Pin8为5V(Vcc)，Pin1为复位(Reset)，Pin2和Pin3原本用来连接Crystal，为了要尽量用完全部IO，所以使用了内部振荡(RC Oscillator)，因此Tiny Arduino共有五个IO。以下是Tiny Arduino的功能。
- 五个IO，各个IO可以设成输入(Input)或者输出(Output)
- 其中两个IO可以设成PWM
- 其中三个IO可以设成Analog输入
如果功能不足够，可以通过I2C对外扩展
Published in
Chinese
Tuesday, 25 September 2012 20:53
Wireless Router Home Automation
This project eliminate the use of an expensive Wifi/Network Shield but still able to control home appliances from any where. You may already own a wireless router which support OpenWRT or else you can get a very cheap wireless router such as WR703N for this project.
In order to eliminate install many packages on the router, I am using HTML and Javascript for the web interface, while hardware interface is using Lua which is come with OpenWRT. The whole process is just install a serial driver (see step below) to make the instruction simple & keep the router free of resources.
Published in
Projects
Saturday, 15 September 2012 15:00
Sending Message to Serial Port of Router using Lua
A few ways to send message to serial port of router which flash with OpenWRT. PHP;ser2net; socat; Lua and etc.
- PHP require to install lighttpd,lighttpd-mod-cgi,lighttpd-mod-fastcgi,php5-cgi,php5-fastcgi,libsqlite3, installation is complicated & consume resources.
- ser2net/socat is very simple but did not support web service.
- Lua comes as a default in openWrt and support web service. The goodies is OpenWRT using Luci for web GUI and LuCI is an embedded rapid application development framework written in Lua.
Prerequisite
- Arduino duemilanove connected to a TP-LINK TL-WR1043ND router which flashed with OpenWRT.
- Using 16 Channel Relay Arduino Controller for the Arduino sketch
Published in
Blog
Sunday, 02 September 2012 14:52
Connecting ULN2803 Line Driver to Arduino
If you are using Arduino (or any other TTL device) to control 4 channel relays or more, I would suggest to use ULN2803 Line Driver instead of Transistors or FETs. You can use ULN2003 which is much more cheaper if you plan to use not more than 7 channel relays.
The ULN2803 Integrated Circuit (IC) is a "Eight-way Line Driver". It allows you to interface TTL signals (5v) with higher voltage/current (50V/500ma) loads.
As shown in figure 1 and figure 2, an Arduino is control 8 relays, one using ULN2803 line driver and the other one using transistors, both circuit are equivalent.
Published in
Blog
Sunday, 19 August 2012 12:13
16 Output Arduino Controller
The is a sketch for Arduino to communicate with computer or embedded device (eg. wireless router) using serial communication.
Arduino Duemilanove have 14 digital IO pins (2 digital IO used by serial) and 6 analog IO pins. Here I coded the analog IO as digital IO, so we can easily get 16 digital IO.
Published in
Projects
Saturday, 11 August 2012 16:59
PHP Control Arduino with TP-Link TL-WR1043ND Router
My previous article Control Arduino via PHP (EasyPHP) control Arduino from a computer with web server. Another article Control Arduino with TP-Link TL-WR1043ND Router which the Arduino is connecting to the router, but it is not safely to control over the internet.
Now I want to control Arduino without a computer and it is very safely control over the internet. Here is the step.
Published in
Blog