Electronics > Projects, Designs, and Technical Stuff

Use for a (very) cheap or low spec microcontroller

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RES:

--- Quote from: romhunter on March 12, 2019, 09:13:42 pm ---I'm just asking if anyone know anything to do with those (very) cheap micro that got absolutely next to no peripheral?

I mean the barebone one, like PIC10F200? ATTiny4? Padauk (god, OTP with strange C)? 89S52? What are they good for?

--- End quote ---

Create a complex sound effects generator (PWM+RC filter output(s) based on a software DDS (direct digital synthesis).
You could, for example, replicate sounds from an old SN76477: https://en.wikipedia.org/wiki/Texas_Instruments_SN76477

Assafl:
I was annoyed with a timer on a coffee grinder... It was annoying that you had to set a time which was either too long or too short.

So I used an ATTiny, a Hall Effect current sensor, and a relay to measure current, calculate RMS current (it used chopped DC so had to use RMS) to decide when the grinder was done and stop it.

Simpler than a timer, cheaper than a timer, is never too long or too short.

And, since I had a CPU I added: a diagnostic LED, variable threshold, pulsing the grinder twice after grind to clear stuck grounds...

 

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