I am feeling a little nostalgic. So I rebuilt one of the first circuits I put together when I started messing around with circuits in eighth grade. It's a very simple beginner project, and...Read More

I want a pan/tilt scheme for the camera of my Raspberry Pi based home monitor robot. But rather than use a pan/tilt bracket with two servos, I thought I could simplify ...Read More

I am working on a Raspberry Pi based robot, and recently acquired a Dagu chassis and a Dagu Mini Driver for this project. As soon as I ...Read More

Here's a short post on communicating with the raspberry from your phone's browser. Our goal is to turn an LED connected to the Pi on and off...Read More

I wanted to design a circuit to generate a nice digital pulse (for input to a microcontroller or the Raspberry Pi) every time an LDR is quickly obscured...Read More

This is how I develop code on my Raspberry Pi: ssh into the Pi from my Macbook Pro from 2 Terminals, and use emacs on one to edit the code, while I ...Read More

This is a short post on getting audio setup on my Raspberry Pi and then making it speak. For the audio setup, I followed instructions on this website:...Read More

I have a couple of servos on a pan/tilt bracket that I want to control from my Raspberry Pi. As I started looking at options, I read about the Adafruit...Read More

I was recently reading about Conway's Game of Life - a cellular automaton discovered by British mathematician John Conway in 1970. Using 4...Read More

This is a short post on setting up the Raspberry Pi (RPi) for development for the first time. Being that the RPi is a full-fledged mini computer, it seems...Read More

The HC-SR04 works as follows: Send a 10us HIGH pulse on the Trigger pin. The sensor sends out a “sonic burst” of 8 cycles. Listen to the Echo pin...Read More

In a previous post, I talked about serial communications with an ATmega168. But that chip has USART - hardware support for serial communications....Read More

Like many folks, I got introduced to microcontrollers through the Arduino platform. The ease of setup, simple language syntax and the availability of...Read More

Freescale makes some nifty accelerometer chips, like the popular MMA8452, for which Sparkfun, USA sells a breakout board....Read More

I just got hold of an HC-SR04 Ultrasonic Sensor Module. This is a short post on hooking it up to an Arduino Uno and getting distance information from it....Read More

Most times your microcontroller is running in a loop, waiting for something to happen - like a button press. All this while it is...Read More

Arduino is fantastic as an intermediary between your computer and a raw electronic circuit. Using the serial interface, you can retrieve...Read More

Say you have a microcontroller circuit that does something when it goes dark. To save power, you want to put the chip to sleep when the ambient light ...Read More

The first thing you do when you learn a new programming language or platform is to write a "hello world" application. This requires...Read More

No, it's not the $10000 Leica lens of similar name. ;-) For this project, I wanted to try and make a simple night lamp – something that...Read More

This is a small project that I worked on last year. I have a desk made of dark wood, and it was very difficult to see what was inside the bottom...Read More