Well, 2 Outputs for the LED indication of temperature, one ADC (you called it A2D).
I use LM335 because it's very very easy to use. Of course, I could also use a PTC (about half of the price or even lower, but accuracy?). and one pin for the heater switch. Yeah, I'll draw a schematic, and attach it to a message.
Maybe I'll add a PC-fan to distribute the air inside. (But adding things won't make it cheaper, unfortunately)
Thanks for the link!
-- I use LM335 because it's very very easy to use. Of course, I could also use a PTC (about half of the price or even lower, but accuracy?). and one pin for the heater switch. Yeah, I'll draw a schematic, and attach it to a message.
Maybe I'll add a PC-fan to distribute the air inside. (But adding things won't make it cheaper, unfortunately)
Thanks for the link!
2012/4/23 John Griessen <john@industromatic.com>
On 04/23/2012 08:50 AM, Mega wrote:
A FET or MOSFET sounds great... They should be far cheaper than a relaise.
Yes, and they switch very quickly, but may need some careful selection to shut off
completely when using a single DC supply voltage for everything...
Will you show us a sketch or schematic of your circuit? What temperature sensor
do you use? Are you using nichrome wire to heat? How many A2D or comparator inputs
are you using on your microcontroller?
Well commented code examples at http://wiki.sgmk-ssam.ch/index.php/Hands_On_AVR#SGMK_tiny
that have the main code chunks of a heater control done already.
John
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