44 lines
1.1 KiB
Lua
44 lines
1.1 KiB
Lua
|
--
|
||
|
|
-- 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)
|