A Gemma M0 controls a 30 pixel LED strip with custom animations mapped to the analog input from a potentiometer
Supplies:
main.py comes with a few preprogrammed light modes that read voltages from the analog pin connected to potentiometer. For < 0.55 V, the full strip will light up with a rainbow cycle
When the voltage reads between ~0.55-1.6 V, the user will be able to control the position of a pulsing light blob
# create center point
pi = int(num_pixels*volts)
for j in range(num_pixels):
if (j > pi-3) and (j < pi+3):
pass
else:
y = sin( 6.28*abs(pi-j)/num_pixels - phase )
if abs(y) > 0.2:
pixels[j] = (0,0,0)
When the voltage reads between 1.6-3.2 V square waves of different frequencies block pixels out and propagate
for j in range(num_pixels):
y = sin( 6.28*j/(num_pixels*volts) - phase )
if abs(y) > 0.5:
pixels[j] = (0,0,0)
At high frequencies you get some cool aliasing effects that make the light strip look random