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Sounds like a good project! I'm a bit confused about what scripts the ESP8266 ends up retaining; I see we can nominate a "boot" script which obviously should control all our other scripts; are there any constraints re the lua code we upload? e.g. can our ESP8266 have a web server, or would that conflict with the OTA code?
interesting question - how much current is needed? We don't want the act of measuring a battery voltage to drain it!
FYI those updated tuned lengths are in Lee Hite's very comprehensive website on wind chime construction - http://leehite.org/Chimes.htmwhich also gives details on tuning for other scales.
Your idea is worth trying - another idea I have seen to save cost is have the same layout (stator coils between rotors) but magnets only on one rotor, with the other a plain steel rotor that still "pulls" the flux thru the coils.
Arduino TFT display and font library
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