Bug-in-a-Book

fB3H2LvZHxXxYd1T

In this fun and easy project (which originally appeared in the Spy Tech edition of Make Magazine), you’ll connect a shirt-pocket “amplified listener” hearing aid with an in-car FM transmitter to create a wireless bug. Then you’ll tuck them inside a hollowed-out book with the microphone (mic) concealed by the... Read more »

Arduino Mail Notifier

YUUuHljDINHRIxe6

Many inventions/hacks often arise out of the need to solve a problem. The Arduino mailer notifier project was no exception. My workshop is in my backyard. During the day, I am far away from my mailbox. Using two Arduinos, some cheap RF modules, and a light sensor, I was able... Read more »

Micro FM Transmitter

lKlDPPRwStUpQydP

This circuit is commonly credited to Japanese multimedia artist Tetsuo Kogawa. It takes audio input through a 1/4″ phono jack and, constructed as shown, without the optional antenna connections, will broadcast an FM radio signal about 30 feet. This is the standard model of Mr. Kogawa’s simplest FM transmitter, which... Read more »

Networked On Air Light

XDoHSEEhYYOVnAMX

You may have seen those “On Air” lights at film, radio or television studios. Now that anyone can broadcast video over the internet, it’s time to learn how to build your own “Now Streaming” light that even wirelessly checks to see if you’re streaming! This guide will show you how... Read more »

Tweet-A-Watt Power Monitor

MvMcD3lGVHKLmwyW

By Limor Fried and Phillip Torrone We live in a rented apartment, so we don’t have hacking access to a power meter or breaker panel. But we still wanted to measure our household power usage long-term, so we developed the Tweet-a-Watt. It uses plug-in electricity monitors at each outlet to... Read more »