A Sensitive DIY Ultrasonic Range Sensor – Update
After I wrote this guide on how to build an ultrasonic range sensor from scratch, I have received many comments […]
Multiplexing the Drive Circuit
I am in the process of converting a remote controlled toy vehicle to an autonomous robotic platform. My initial thought […]
A Sensitive DIY Ultrasonic Range Sensor
I needed some ultrasonic range finders for my project. But most of the commercial sensors like Parallax’s PING sensor and […]
Digital Metronome
It is fairly simple to build a digital metronome using an ATmega328 AVR chip and some minimal programming using the […]
Simple Optical Encoder For Wheel Rotation Detection – II
In my previous post, I showed a simple optical encoder circuit that is TTL compatible. The main drawback of the […]
Simple Optical Encoder For Wheel Rotation Detection – I
To detect wheel rotations in model vehicles, we would need to install some kind of sensors on the wheels to […]
Modified Sine Wave Generation With AVR
Modified sine wave is essentially just a pulse width modified square wave. It is a very useful waveform for power […]
Simple External Powered USB Port
I recently bought a TrendNet TK-207K KVM switch. After hooking up my mouse and keyboard, I was suprised to find […]
4KHz-170MHz Wide Band RF Signal Generator – II
Continue with my previous article, let me first explain the code a little bit.
4KHz-170MHz Wide Band RF Signal Generator – I
A signal generator can come in handy when working with digital and analog circuits. While most commercial grade signal generators […]
Brother MFC-7340 Setup Under Linux
I just bought a Brother MFC-7340 multifunction laser printer to replace my old Lexmark Optra E310 which I have had […]
Temperature/Humidity Data Logger — Trial Run
I built a rather generic I2C data logger a few weeks back. As I mentioned in my earlier posts, it […]
Hex/Bin/Dec Converter And Calculator
When working with micro-controller projects, it is often necessary to perform calculations in binary and hexadecimal forms. While almost all […]
Wide-band RF Field Strength Meter
Field strength meter is extremely useful when working with RF devices. It can be used to quickly diagnose whether a […]
RF Data Link Using Si4021 And Si4311
Among the many commercial ISM band RF transmitter and receiver ICs, I have found that Silicon Labs‘ Si4021 (transmitter IC) […]