Automated Fan Speed Controller

When our house was built, I put a server room next to my office. Unfortunately, it had only a small bathroom-style fan with a 4″ duct leading outside, and during the summer I had to leave the door open, which made my office hot and loud. So I installed a... Read more »

One-Ton Linear Servo

RC hobby servomotors were just made for hacking. What’s not obvious is how much you can hack them — with a few tricks, you can use a servo to control almost anything. Hobby servos consist of a DC gear motor, a potentiometer (usually 5K), and a control circuit. The output... Read more »