Hey guys, I'm a newbie to Ardunio and am trying to make a very small heater (max 3 inches) that goes at a maximum temperature of 33C (92F). First what kinds of heater can I use? I looked at PTC heating elements but I cannot connect them to Ardunio and second how do I connect them to an Arduino and control it. also what kind of a power supply does it need? 
Thank you!!
What kind of power supply? What kind do you want to use? Battery? Mains power? How big, physically? How long does your heater need to be on? What lifetime is needed?
Paul
]Do you want to make the heater or buy the heater?
Yes, I want to use dc battery power. As I said I want it to be maximum 3 inches and needs to work a few hours every day. I'd rather buy the heater.
Thank you!
Amount of heat is not measured in inches. How much heat do you need in BTU, calories, Watts or Joules?
I would need less than 1Kw.
mmortazzavi:
I would need less than 1Kw.
1 KWatt heater running from battery? What battery is it? Could you explain what do you need it for?
Im not really sure about how much I need, I meant to say 1w. It is a mask to warm your face.
Hi,
Welcome to the forum.
Please read the post at the start of any forum , entitled "How to use this Forum".
OR
http://forum.arduino.cc/index.php/topic,148850.0.html.
What is the application?
What are you heating and will you need to also run a fan?
Thanks.. Tom... 
Just use some resistors of an appropriate power rating and resistance.
Yes tom, I will need a fan too.
“ It is a mask to warm your face.”
Hey, we live where it’s so coooolllldddd eight months of the year; January <= -25°C.
Face masks don’t need extra heating, it’s the mitts and boots that need extra heating. 
Well can you help me make it?
