Miscellaneous
I recently bought a TrendNet TK-207K KVM switch. After hooking up my mouse and keyboard, I was suprised to find out that the setting did not work. The mouse and keyboard would act strangely and sometimes one would stop working…
Continue with my previous article, let me first explain the code a little bit.
When working with micro-controller projects, it is often necessary to perform calculations in binary and hexadecimal forms. While almost all calculator tools (such as calc under Windows and gcalctool in Linux) can handle such tasks, they are designed for general…
Field strength meter is extremely useful when working with RF devices. It can be used to quickly diagnose whether a transmitter circuit is working, and can be used to detect RF signals in the environment.
I used to own an all-transistor, single channel 10 MHz analog oscilloscope. While it was not adequate by nowadays standard, it served me quite well for many years. The scope was later sold and I had been thinking about getting…
Well, there is an old saying:“There’s no such thing as a free lunch.” After yesterday’s server upgrade, everything worked pretty well till sometime late this afternoon.
I have finally got around to upgrade my web server. The server I have been using was an old Pentium III about 10 years old. It had been serving my website quite well over the years till recently.
This is what I ran into for the first time: I was flashing the chip the other day and after many successful runs I encountered the following infamous avrdude error:
Using PC’s parallel port is a convenient way to control a stepper motor. For unipolar stepper motors, up to two motors can be controlled with the 8bit data line.
Using DTR (data terminal ready) and RTS (request to send) pins of a PC serial port (RS-232) without actually using the serial data pins, we can interface at least two relay devices with a computer. Windmeadow Labs has an excellent…
One of my older CRT TVs does not have a built-in degauss button and after sitting in the corner of the basement for a couple of years, it somehow got magnetized pretty badly. The top two-thirds became totally disclorored with…
A touch sensitive on/off switch can be made with a single MOSFET. The following schematics illustrate such a switch using only a power MOSFET (IRFZ22).
When Google Chrome beta for Windows was first released last September, I tested it briefly on a Windows XP box and was quite impressed by its speed and simplistic user interface.
Hall effect sensors can be found in many common household gadgets. Most brushless DC motors for instance, like those used in computer cooling fans, contain Hall effect sensors in the driving circuits.