Can anyone recommend a low cost or DIY buildable logic analyzer?
Mostly, it would be for debugging serial protocols (SPI, I2C, RS232) at low voltages.
Answer
The Bus Pirate is probably your best bet - open source software and hardware, easy to build if you don't mind SMT, cheap if you buy it assembled ($30 shipped worldwide).
http://code.google.com/p/the-bus-pirate/
Lots of variants, with a lot of people supporting it:
http://www.google.com/search?q=bus+pirate
The bus pirate is mostly useful for serial work, though it can do some small amount of simple logic analyzer functions. If you need to do a lot of logic analyzer work, this product looks very nice:
http://dangerousprototypes.com/open-logic-sniffer/
Open source, but has very good capabilities. Very inexpensive, though.
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