More exciting articles at: yu.xueming.org
OpenRISC(1): First run OpenRISC on de0-nano board
Update: this post has been moved to a new home yu.xueming.org
The scope of the OpenRISC project is so extensive that it covers wild range of areas including processor architecture, implementation with register transfer language, simulation tool, synthesis tool, and tool-chain SDK. It is hard to believe the OpenRISC community behind this project has been able to put together the tremendous amount of efforts to successfully implement each single component, creating a valuable, well-performing, but free soft CPU for anyone to use.
…
Continue at yu.xueming.org
Notes on PHP: Restart apache won’t reset php session
To be honest, it is a little odd that PHP session won’t be destroyed after Apache server got restarted. In order to truly kill the PHP session, especially during development, I created a piece of following code, and ran it everything I wanted to have a clean start:
<?php session_start(); unset($_SESSION['session_name']); session_destroy(); ?>
Drive computer vision camera (Point Grey) on single-board computer (Banana Pi)
Computer vision cameras come with extremely small size without too much compromise on image quality…. continue on yu.xueming.org
My blog has moved to yu.xueming.org
How to rework small surface mount LED
I talked about soldering small surface mount LED in my previous posts by using DIY reflow oven. Today I would like to show you how to rework similar LED, which is, to desolder this LED off the PCB and solder a new one on it… continue on yu.xueming.org
Update: my blog has moved! Check out: yu.xueming.org
Teardown of Ricoh Theta 360 Degree Spherical Panorama Camera
The first impression of the Ricoh Theta 360 Degree Spherical Panorama Camera is its odd appearance — to me it feels like a bar of chocolate wafer. The dual lens reminds me of the bubble eye goldfish. For some reason I was given this 1st generation Ricoh Theta camera for free, but broken. So why not taking a peak at its inside? … continue on yu.xueming.org
Update: my blog has moved! Check out yu.xueming.org
DIY, how to build your own cantilever sliding gate (8) Mount the fencing board!
I’ve decided to decorate the sliding gate with fencing board from the very beginning. Now the posts were set, the gate was assembled, and the gate opener was installed and powered. Finally, it’s time to start mounting the fencing boards to finish this project! … continue on yu.xueming.org
Update: my blog has moved! Check out yu.xueming.org
DIY, how to build your own cantilever sliding gate (7) Install the gate opener
There is a wide selection of gate opener products available online or at local shop, The price would range from several hundred dollars to more than a grand. It is really hard to tell the difference by the appearance. After intensive research on reviews, I decided to purchase the ALEKO AR1450 sliding gate opener with gear rack… continue on yu.xueming.org
Update: my blog has moved! Check out yu.xueming.org
DIY, how to build your own cantilever sliding gate (6) Run the power cord through underground conduit
Gate frame is up, now it’s time to do the electrical work. First of all, I needed to have power on the site! After searching around the house, I decided to run the power cord from my garage. I already noticed that my garage is on a 25 Amp breaker in my plan. 25 AMP should allow enough juice to flow through for the gate opener… continue one yu.xueming.org
Update: my blog has moved! Check out yu.xueming.org
DIY, how to build your own cantilever sliding gate (5) Weld the galvanized pipes into a gate frame
Welding was the only worrisome part of this project when I decided to build this cantilever gate because I never welded before, nor do I own a welding machine…continue on yu.xueming.org
Updates: my blog has moved! Check out yu.xueming.org
Xueming Yu 