The Lisp Star is a star-shaped pendant that you can program in Lisp to make its six colored LEDs twinkle in different patterns:
The pendant is based on the ATtiny3227, a microcontroller with 32Kbytes of flash memory and 3Kbytes of RAM, enough memory to run an integer version of my Lisp interpreter, uLisp. Current consumption is approx. 5mA, or 0.1µA in sleep, giving negligible battery drain.
To program it you connect to it from a computer via the six pads on the front of the pendant, and you can then enter a program written in uLisp, or edit an existing program, via a serial terminal or the Serial Monitor in the Arduino IDE.
It’s powered by a 3V coin cell on the back. Press the push button to run the Lisp program and start the pendant twinkling, and press it again to turn it off. Alternatively, the pendant turns off automatically after a delay to avoid accidentally running down the battery.
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