[NetBehaviour] Spud - A Potato-Powered Web Server

marc marc.garrett at furtherfield.org
Tue Jul 19 13:04:21 CEST 2005

*Spud - A Potato-Powered Web Server*

This is an actual potato-powered Web server, currently online here. 
After the great SpudServer joke, I thought it would be interesting to 
see what an actual server capable of running on potatoes would look 
like. This server is very, very slow (around 0.2 hits/second), so you 
may have trouble connecting.

The CPU is a Microchip PIC16F876 running with a 76.8 KHz clock and a 
nominal 1.5V supply voltage (somewhat outside the manufacturer's 
specifications). At this speed and voltage, it draws 20 microWatts 
(0.00002 Watts), or roughly 100,000th to 1 millionth the power of any 
Intel 386 board I know of. It connects via SLIP at 4800 baud.

Every 5 minutes or so, a PC measures the voltage, current, and power 
output of the potato battery and sends the values in a small UDP packet 
to the server. The server then updates some internal RAM variables which 
are displayed as part of its home page. So you can watch the potatoes 
discharge (kind of like watching corn grow). I have no idea how long the 
battery will last. The server will fail when the voltage drops below 
about 1.35V.

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