never used the oopic directly but my EE budies liked them better than the basic stamp. I guess they run an embedded C code so should be much more comfortable than programming in asm, and execute faster than a stamp.
If your doing something simple there is no shame in using a basic stamp. For my senior design project I designed a braking system for a formula car, and needed a way to quantify the braking effects. Slap a $30 dual axis accelerometer on a $50 BS2 and you have a wicked cost effective g-tech that logs data. That and it only took me a day to flesh out the code.
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