Starburst

Starburst
Status	Stable
menuconfig	Applications->Starburst
Pinning	yes (optional)
Ecmd	no
Depends on	DMX Storage PCA9685
Requires	a PCA9685on the i2c bus
Code	https://github.com/ethersex/ethersex/tree/master/services/starburst

Starburst uses the DMX data stored in DMX Storage and transmits it using I2C to a PCA9685 PWM controller. The PCA9685 is best for driving other circuits like high power LED drivers.

Starburst vs. StellaLight

Starburst advantages:

• just needs two pins (3 pins for stroboscope)
• has 12-bit PWM, thus can apply the Stevens' power law
• delegates PWM generation => no load on the AVR
• saves program space

StellaLight advantages:

• does not need an extra controller

Slave Address

Enter the I2C address of the PCA9685 in the menuconfig in decimal format. Here's how to calculate it:

fixed	A5	A4	A3	A2	A1	A0
1	1	0	0	0	0	0

to decimal => 96

DMX layout

DMX 0	DMX 1	DMX 2	DMX 3	DMX 4	DMX 5	DMX 6	DMX 7	DMX 8
channel 1	channel 2	channel 3	channel 4	mode 1	mode 2	mode 3	mode 4	global strobo (optional)

Valid Values

channel n : 0-255

mode n : 0 (instant change) 1 (fade to target)

global strobo : 1-25 (results in 1hz - 25hz) - 0 => no strobo

Stroboscope support

If you want to use the output enable pin, tick

  [*] Strobo Effect

and add the pin to your hardware pinning file (in this case PORTA PIN0):

  PCA9685_OE(PA0)