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Monday, 04 May 2015 20:00

Recover bricked TL-MR3020

If your TL-MR3020 router is bricked with the following symptoms, most likely you can use this method to recover it.

  1. Ping the router without problem
  2. Telnet connection failed
  3. SSH connection failed

 

Solution:

  1. Put the router switch to AP mode
  2. Turn on the router power
  3. Push and hold the "WPS" button
  4. When the WPS Led flash slowly, switch on AP mode to 3G mode. The LED should flash quicky.

Now, you can Telnet to router

 

Erase the root data

Login to the router via telnet and enter the following command. Most likely your router is now recovered. 

mtd -r erase rootfs_data

Continue following procedures if it is still not working.

 

Copy firmware to router

  • Login to router via telnet and change the password in order to enable SSH
passwd
  • Copy the OpenWRT firmware to the router /tmp folder. I personally like and use WinSCP.

 

Upload the firmware to router

SSH to router and write the firmware to router. Where code.bin is your OpenWRT firmware file. 

mtd -r write code.bin firmware

Reboot the router and your router should be working now. If all the above methods is not working for you, then you should go for Serial Console method to recover the bricked router.

How to increase storage on TP Link TL MR3020 with

The TP-Link TL-MR3020 N150 3G/4G Travel Router is a very small device with a size of 74mm x 67mm x 22mm, it has only 4MB flash and 32MB memory. The router have about 428KB (67%) space available after installing OpenWRT Barrier Breaker 14.07, you may encounter shortage of storage when installing certain extensions due to limited of router space. 

By employing OpenWrt's extroot, you can expand the storage capacity of your root file system using the additional space of an added storage device.

Thursday, 05 March 2015 23:29

Arduino based Electronic Queuing System

Queue calling system

This is a Queuing System project requested by a clinic asistant which allows the doctor enter number from a keyboard and display it on a 32x16 LED panel.

This project uses two Arduino, the first Arduino functioned as a SENDER which included a PS2 keyboard and a mini LCD for number input. While the other Arduino is functioned as a RECEIVER which will trigger a "ding-dong" tone and display number on the 32x16 LED panel.

The SENDER uses a PS2 keyboard instead of USB keyboard, USB keyboard will cost higher since it require a USB host shield. You should get a Matrix keypad (please use google translate) in case the PS2 keyboard is not available in the market.

These two Arduino (SENDER & RECEIVER) is connected via a CAT5e network cable, the CAT5e cable provide power to the RECEIVER and also transfer data between two Arduino.

This project provides step by step approach to driving a Dot Matrix Display (DMD) Panel with an Arduino. The DMD is a 512 pixels single colour LED display arranged in 32x16 layout, a 16 pin (2x8) IDC connector is used to interface with Arduino.

In order to drive the 32x16 Dot Matrix Display Panel from Arduino, the DMD library for Arduino is required. You can download it from Freetronics GitHub.

The Freetronics DMD library is able to write letter and text on the display board with limited function, variable string and text centering is not supported. Yeah! now you can use my code to write variable string on the display board and centering it horizontally.

Updated: DMD2 library is released, this library is currently in BETA release.

Sunday, 08 February 2015 21:09

Arduino电子排队叫号机

这是为谋诊所设计的排队叫号机,计数器只需显示两位数。此叫号机使用了两片Arduino,一个安置在房内用来输入编号,称之为发送器,另一个则安装在房外,用来显示编号,称之为接收器。发送器是通过串口发送信息给接收器。

发送器连接了一个PS2键盘来完成输入,当然也可以使用USB键盘,不过必须添加一个USB Host Shield,这样将会增加成本。如果没办法取得PS2键盘,建议使用矩阵键盘。发送器也应用了一个小型LCD,用于显示编号,当然还能显示更多的相关资料。

接收器用了一片32x16像素的矩阵LED单元板,用来显示从串口取得的相关数据。接收器也安装了一个“铃铛”报知器,每当接收到来自发送器的数据,都会温馨提醒一下。

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  [email protected]

32MB

8MB

4x1

Yes

Yes

Yes

Yes

2.x

Atheros[email protected] 64MB

64MB

8MB

4x1

Yes

Yes

Yes

No

此教程使用一个TP-Link TL-MR3020 3G/4G无线路由器来打造简单的无线广告机。目标是提供一个免费热点(hostpot)让公众无线上纲同时弹出hostpot提供者的广告(称之为Splash page 或者Landing page)。

TP-Link TL-MR3020的厂家固件(Firmware)功能有限,不能安装第三方软件包,因此,固件必须升级至OpenWRT,然后再安装NoDogSplash

虽然这里是使用TP-Link TL-MR3020为教题,一般支持OpenWRT的路由器也是适合的。 

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 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.

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