How To: Hack a 20-Year-Old "Brick" Phone into a Digital Cell You Can Text On
The cell phone has come a long way. The very first "mobile devices" were made and used by the military in the late 1930s, with the first commercial mobile telephone service introduced by Bell in 1946. These devices were hardly what we'd call mobile today—some took up the whole trunk of a car, and others had to be carried on your back in a heavy bag.Moving forward a few decades, today's mobile devices are essentially pocket-sized computers that can perform almost any task you can think of. But before they got here, there was a bit of an awkward phase... Image via dropbox.com Remember these?When Andrew F. was given an old-school 90s "Brick" phone (specifically a Motorola Ultra Sleek 9660), he decided to upgrade it by embedding a DIY cell phone made from a printed circuit board.The new guts bring it from analog to digital and into the 21st century, allowing it to work on today's cellular networks. Plus, a bigger OLED screen gives him enough space to read and type text messages. Image via dropbox.com Andrew used two 328 chips to communicate with the Sim900—one to handle input and graphics and the other for sounds. He wrote a program to give it texting capabilities and designed a custom PCB in Eagle. Image via dropbox.com To conserve space, Andrew used surface mount Arduino chips and an Arduino Shield for the boot-loader.He had to remove the original battery and mount a 7.2V lipo battery inside with a hole drilled for the charging cable. Image via dropbox.com Finally, he replaced the old analog antenna with a 900mhz GSM antenna. In the future, he wants to add a more powerful chip to give it more capabilities like Tweeting.You can find more details, plus the code for the PCB, over on Andrew's blog.
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