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Sunday, 12 October 2014 15:12

Using HEF4094 Shift Registers with Arduino

I have many seven segment modules in my hand. Each module consists of 5 digits and each digit is controlling by individual HEF4094 shift register. As shown in figure above is the seven segment module.

HEF4094 is an 8-stage serial shift register. Data is shifted on the LOW-to-HIGH transitions of the CP (Clock) input. The product data sheet is available here.

HEF4094 operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually ground). There is also 74HC4094 available which operates at 2V to 6V.

I own a TP-Link TL-WR1043 V2.1 wireless router, I would like to test if it is able to run on OpenWRT or DD-WRT. it is first tested on OpenWRT, DD-WRT later, so far it has been working flawlessly for me.
 
About TP-Link TL-WR1043 V2.1 Wireless Router
TP-Link TL-WR1043 V2.1 is a 300Mbps Wireless N Gigabit Router, it has more memory (64MB) compared with the TL-WR1043 V1.x. Here is the comparison:

HW Version

CPU

Ram

Flash

Network

Gigabit

USB

Serial

JTag

1.x

Atheros  AR9132@400MHz

32MB

8MB

4x1

Yes

Yes

Yes

Yes

2.x

AtherosQCA9558@720MHz 64MB

64MB

8MB

4x1

Yes

Yes

Yes

No

This is a guide on how to setting up a simple wireless hotspot using a TP-Link TL-MR3020 3G/4G Wireless N Router installaing with NoDogSplash. The goal is to provide a free hotspot with a splash page to advertise who is providing the hotspot, it should work as well for other OpenWRT supported router.
Friday, 04 July 2014 13:54

Arduino based RGB Matrix LED tester

Arduino based RGB Matrix LED testerArduino based RGB Matrix LED tester
This is a very simple Arduino project which control the 16x32 RGB LED Matrix Panel via an 16pin IDC cable. The Arduino will continuously sending 5 set colours (Red, Green, Blue, White, Black)  to the LED Matrix Panel that allow the technician to find out which part of the LED Matrix Panel is malfunction.
Tuesday, 10 June 2014 14:52

Raspberry Pi Digital Signage

Raspberry Pi (Model B) is a single-board computer that uses an ARM 11 (ARM1176JZF-S core) processor running at 700MHz (it can overclock up to 1GHz) with 512MB RAM.
 
This article shows you how to turn your Raspberry Pi into a cheap, browser based digital signage solution. It covers setting up a mini webserver on using the lighttpd+PHP web server and also how to start a web browser without a desktop environment.
 
I will use Midori as the web browser since it is a default browser that is found in Raspbian (a free operating system based on Debian optimized for the Raspberry Pi).
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