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- --
- -- Light sensor on ADC(0), RGB LED connected to gpio12(6) Green, gpio13(7) Blue & gpio15(8) Red.
- -- This works out of the box on the typical ESP8266 evaluation boards with Battery Holder
- --
- -- It uses the input from the sensor to drive a "rainbow" effect on the RGB LED
- -- Includes a very "pseudoSin" function
- --
- function led(r,Sg,b)
- pwm.setduty(8,r)
- pwm.setduty(6,g)
- pwm.setduty(7,b)
- end
- -- this is perhaps the lightest weight sin function in existance
- -- Given an integer from 0..128, 0..512 appximating 256 + 256 * sin(idx*Pi/256)
- -- This is first order square approximation of sin, it's accurate around 0 and any multiple of 128 (Pi/2),
- -- 92% accurate at 64 (Pi/4).
- function pseudoSin (idx)
- idx = idx % 128
- lookUp = 32 - idx % 64
- val = 256 - (lookUp * lookUp) / 4
- if (idx > 64) then
- val = - val;
- end
- return 256+val
- end
- pwm.setup(6,500,512)
- pwm.setup(7,500,512)
- pwm.setup(8,500,512)
- pwm.start(6)
- pwm.start(7)
- pwm.start(8)
- tmr.alarm(1,20,1,function()
- idx = 3 * adc.read(0) / 2
- r = pseudoSin(idx)
- g = pseudoSin(idx + 43)
- b = pseudoSin(idx + 85)
- led(r,g,b)
- idx = (idx + 1) % 128
- end)
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