Archive for January 2011

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 other similar products are quite expensive, especially if multiple units are needed. So I thought why not building it myself? Continue reading ‘A Sensitive DIY Ultrasonic Range Sensor’ »

Digital Metronome

It is fairly simple to build a digital metronome using an ATmega328 AVR chip and some minimal programming using the Arduino libraries. The main challenge though is to display the tempo information conveniently. Continue reading ‘Digital Metronome’ »

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 circuit is that it does not provide enough resolution since the encoder is only triggered when the mounted mirror is aligned. Continue reading ‘Simple Optical Encoder For Wheel Rotation Detection – II’ »

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 be monitored. Continue reading ‘Simple Optical Encoder For Wheel Rotation Detection – I’ »