#ARDUINO ANALOGWRITE VS DIGITALWRITE CODE#

$30-50 for a 8-12relay or 8-12triac shieldĪt this point you could have just bought a renSS16 shoudl make this and advanced option aboveĪlso starting with an arduneo is about the most expensive way you can start on a light controler much harder to under stand so the newbie who needs help is never goign to use it and i dotn think you can solve that. Here is what happens when you do things the fast way. :)ĪND on this forum both are appreciated and welcomed. This is a hobby to please as many as possible with the least amount of barriers. 'b)' gets everyone running very quickly in a standardized way - with some limitations. To help beginners with 'growing pains' requires more experienced coders who understand the programming subtleties. It's also more micro dependent due to port differences.

#ARDUINO ANALOGWRITE VS DIGITALWRITE CODE#

'a)' doesn't work for beginners who start with a low channel count and no code experience. And so there are two schools of thought Ī) Always use the fastest optimized code, (takes more careful thought and study)ī) Make it easy and general for all, especially where speed doesn't matter. These concepts have been mentioned before. Although direct port manipulation isn't an answer to every problem, in this case It's more work, but you can keeping up with the frame-rate for 16 channels per Arduino with optimized code.įoxCub16 uses direct port manipulation and the code will work on an Arduino. Using digitalWrite in round robin fashion results in delays, glitches, hangups and displays that can't keep up.Īlso 'delay' is a bad idea, because delay hangs up processing for the length of the delay.Ī better solution to these issues is direct port manipulation and interrupts. And it's even worse if you'reĪlso not all of the PWM channels on Arduinos run at the same speed and analogWrite doesn't run on every pin, therefore analogWrite has limited usefulness.Īlso PWM requires zero crossing detect if you're working with AC. Frame rates to sync well with music should be around the 57600 baud rate. This is slow, real slow and that's without any dimming. Make that 64 channels instead of 16 = 3.8KHz. digitalWrite takes about 4.09uS to execute and analogWrite takes 7.6uS.ġ/4.09us = 244.5KHz (that's the maximum speed you can run digitalWrite)Ģ44.5KHz / 16 = 15.3KHz (your frame rate). I've noticed a recent trend towards digitalWrite / analogWrite and delay for controlling christmas lights.ĭigitalWrite and analogWrite are extremely slow.

Arduino analogwrite vs digitalwrite