Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

The Sophisticated Homebrew Digital Humidity and Temperature Sensor

The Thanksgiving have passed by, and if you’re feeling bored sitting in your house for by doing nothing, then you might want to try something more fun and interesting project! Well, it’s not too hard to buy a humidity and temperature sensor on the market, but you need to spend over $30 or more for a simple sensor and it definitely didn’t worth at all! Instead of pulling the money out from your pocket, why don’t you keep the money warm inside your wallet, by simply build your very own digital humidity and temperature sensor? Since most of the components that being used here are mainly cheap, thus you don’t need to spend too much for constructing a cheap digital humidity and temperature sensor. This is going to be a very compact data logger that using the SHT11 or SHT15 sensor for humidity and temperature. For your information, the logger will contain 128Kbytes of memory for logging 32768 samples of temperature and humidity or 26214 samples of temperature. The AT90S8535 will be the main heart of this project and it… Continue reading

Microcontroller-driven Lego Vehicle

Old good projects are always good to have near by. Projects in Cornell University are being stacked from 1999 and there are many wonderful ideas and finished microcontroller designs.  Some of them we are going to review here from time to time. This Lego vehicle has been modified so it could be controlled by AT90S8535. Despite code and AVR microcontroller are obsolete, it can be modified to newer very easily. Microcontroller can accept 6 commands from 6 buttons for controlling steer left, right, move forward, reverse, stop, rise and lower tray. Two stepper motors provide steering while DC motor is used for forward and reverse movement.     Car even has a differential wheel system run by planetary gear system. Motors are controlled via transistor switches that accept 5V from AVR microcontroller board and provide 12V switched voltage. Really cool project for hobbyists. Continue reading