[Jekyll]

I am an Electrical Engineer, and I would opt for using resistors to protect the arduino. The few pennies and the extra 15 min it would take is worth the piece of mind. I would also add heat sinks to the FETS.

Other than these concerns it looks great. Well done!

Gary

Can you give me a bit more info on the heat sinks? Most calculations I’ve seen suggest these can switch 2 amps without needing a sink. I’ve also run a 2.5 amp motor for a few hours using PWM on the fet without a sink and it didn’t get noticeably warm. In any event, the LED spotlights I’m using with this board draw 60mAmps each at full brightness. Given the board has 6 mosfets, that would be 180 LED spots which would make a really bright Halloween yard.

 

[[email protected]]

Agreed, for this application (PWM) LED lighting it could alter the switching hysteresis. If this was driving something like solenoids or motors, the possibility of short is higher, thus the protection.

 

[Sparkey]

Sorry about that. Was in process. Now posted here and on the blog.

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Thank you for including this. Do you have any extra PCBs you want to get rid of?

 

[Jekyll]

Thank you for including this. Do you have any extra PCBs you want to get rid of?

Yes. I have to order more than I need. PM me your address and I can put one in the mail.

I’ve been reading more about use of millis(), and I think I need to update my code to handle the roll-over. At about 50 days (or 2^32 milliseconds) millis() starts over at zero. It should be an easy fix, and I’ll post back here when I get it done. In the meantime if you use this code, just make sure you turn it off at least once every 50 days

 

[WickedWino]

Fantastic post! Thank you so much for sharing your code too! That firelight effect is super cool. And the video on your blog stepping through the effects was great to see it in action. I've been investigating using an arduino to control the lighting in a section of my haunt. If you still have any extra PCBs I would love to purchase one from you.

 

[Jekyll]

Thanks! Glad it was helpful.

I’m working on a programmable assembled board with the arduino chip integrated into the same board with the mosfets, but it’s still in process. Will post back here when it’s ready.

In the meantime, I do have a few PCB’s left that you can solder yourself. I’ve been sending those out for $10 each; $15 for two. I’ll PM you for details.