[TriEmbed] Sine waves from a $1 uC

[Scott Hall]

For those times when you just need to generate a quick true-sinewave
signal, Elektor Magazine has put out an article on their Elektor LABS
forums on using a ATTiny45 to generate a sine wave via a IIR filter:

Sine generation by an IIR filter approach on low-cost 8 bit MCU's:
https://www.elektormagazine.com/labs/sine-generation-by-an-iir-filter-approach-on-low-cost-8-bit-mcus

- sgh
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