Home Made Arduino Prototype Shield

Making my own Arduino Prototype Shield

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Arduino Uno R3

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GPA Calculator

Self made program to make calculation of GPA much easier

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Microchip Delay Calculator

A delay calculation program for Microchip's MCU

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Welcome to waihung.net

Bluetooth Controlled Relay

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A relay is an isolated switch, there is no connection between the switching device and the connection. Relay is often used when controlling high voltage devices so that the intricate low voltage devices will not be damaged. There are many types of relays but the most commonly used ones are electromechanical relays. They are cheap, simple and provide very good …

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Persistence of Vision

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Persistence of vision is a phenomenon where our eyes retain images for a fraction of a second. By taking advantage of this phenomenon, we can quickly project images by portions and the human eyes will still perceive it as a complete image. Persistence of vision or POV in short is commonly found in electronic projects and there are a multitude …

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Arduino Tip : Built-in Pull-Up Resistors

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I’ve just found out a pretty awesome feature on the Arduino, or rather on all ATmega 328Ps. Below is a simple circuit that uses an ordinary push button to light up an LED. Normally I’ll need a pull-up resistor as shown in the red box, but with the built-in pull up resistors, I can totally remove that part and save …

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PHP + MySQL

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When studying electronics, it is very rare that you would come across a syllabus that teaches PHP + MySQL. It’s for the guys studying IT. I found myself needing it when developing electronic systems that requires Internet connectivity. Simply put, PHP and MySQL allows an electronic device to retrieve and store data through the Internet. This will of course enable …

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Arduino Bluetooth LCD

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Did a simple test with the Bluetooth module, send a text from the computer and display it on an LCD. Useful for displaying messages wirelessly, something like the queue counter displays you see in banks. I used the same exact sample code from the Arduino IDE. You can find it in File -> Examples -> LiquidCrystal -> SerialDisplay. Just connect …

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Skylab SKM53 GPS Module

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I got this GPS Module from ebay at just under RM 80. It’s not cheap but this is the cheapest solution to get GPS signal for any electronic projects. The module has a built-in GPS antenna and also the Skylab SKM53 chip. The moment when I tried to plug the module on a breadboard, I realised that the pitch of …

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