nodemcu-firmware/docs/en/modules/apa102.md

APA102 Module

apa102.write()

Send ABGR data in 8 bits to a APA102 chain.

Syntax

apa102.write(data_pin, clock_pin, string)

Parameters

• data_pin any GPIO pin 0, 1, 2, ...
• clock_pin any GPIO pin 0, 1, 2, ...
• string payload to be sent to one or more APA102 LEDs. It should be composed from a AGRB quadruplet per element.
  • A1 the first pixel's Intensity channel (0-31)
  • B1 the first pixel's Blue channel (0-255)
    
  • G1 the first pixel's Green channel (0-255)
  • R1 the first pixel's Red channel (0-255) ... You can connect a lot of APA102 ...
  • A1, G2, R2, B2 are the next APA102s Intensity, Blue, Green and channel parameters

Returns

nil

a = 31
g = 0
r = 255
b = 0
leds_bgr = string.char(a, g, r, b, a, g, r, b) 
apa102.write(2, 3, leds_abgr) -- turn two APA102s to red, connected to data_pin 2 and clock_pin 3