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