Is It Possible To Ramp Up And Down The Brightness Of Leds?

Question

No lucking finding a post on this. I am working on a BB-8 driod with the EZ-Robot and am looking to get LEDs to quickly ramp to full brightness and fade out the same way (as opposed to just turn on or off.) Any ideas on the best way to achieve this?

Thanks,

Bob

thetechguru · Answer

Yes, you can use PWM to control the brightness of an LED, so a script that ramps up and down the pwm going to the digital port will do it. Alan

DJ Sures · Answer

Use the ServoSpeed() command to apply a ramping speed to the PWM. And as alan mentioned, use the PWM command to set the brightness. Something like this...
 # set the servo speed to 2 ServoSpeed(d0, 2) :loop # Set LED On pwm(d0, 100) # wait some time for the pwm to do its ramping thing sleep(3000) #set LED Off pwm(d0, 0) # wait some time for the pwm to do its ramping thing sleep(3000) goto(loop)

Science Bob · Answer

I figured it might be through the Servo controller. Seeing the code is very helpful. Thanks for the fast response, guys!

thetechguru · Answer

Oh, good one DJ. I didn't think about using the PWM ramping built into Servospeed. I did this script (D11 is my LED)
 $brightness = 0 repeatwhile($brightness) <= 100) PWM(D11,$brightness) $brighness = $brightness + 1 Sleep(150) endrepeatwhile