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~$15 Dew Heater Controller

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#1 TopherTheME

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Posted 03 August 2020 - 07:14 PM

I've never understood why dew heater controllers were so expensive given they're relatively simple devices that don't require any fancy hardware. Yes, some have a lot of bells and whistles like having temperature probes and measuring relative humidity and such but even a basic simple unit is often well over a 100 bucks. This is my latest mini-project that I made out of spare parts and an enclosure I made with my 3D printer. Its a simple 2-channel unit that I made for my imaging setup, one heater for my photo-scope, one heater for my guide scope.

 

_IGP0942.JPG

 

The heart of the controller are some off the shelf PWM motor drivers I got on amazon for ~$8, you can find them here: https://www.amazon.c...96499095&sr=8-5

They're good for about 2A at 12V which is more than enough to drive a heater which is usually around 250-1000mA. They also include LED's which get brighter the more you crank them up. The power supply is some AC to 12VDC adapter I pulled out of my electronics bin, I think it came with an old cable modem. 

 

_IGP0944.JPG

 

So there you have it a simple, cheap, and effective dew heater controller that anyone can make. 


  • mtc, John Miele, scott4comp and 6 others like this

#2 Mark Strollo

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Posted 04 August 2020 - 11:30 AM

Consider a 1-2 amp inline fuse, too.  Friends have had heater and wiring shorts.



#3 TopherTheME

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Posted 04 August 2020 - 12:58 PM

Consider a 1-2 amp inline fuse, too.  Friends have had heater and wiring shorts.

 

No need, its built into the ASIC, "The controller is safe with a self-recovery fuse 2A." waytogo.gif

 

Of course its always a good idea to play it safe and add one in there anyway but if I burn one of these up its only $4 to replace it. 



#4 skywolf856

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Posted 04 August 2020 - 03:41 PM

Nice!

I did the 3-Channel version by Gary Honis.

 

http://dslrmodificat...Controller.html




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