Alan B. Pearce ha scritto:
>> This is a point indeed. I was planning on using a transistor
>> as well, coupled to a tiny SOT23 such as MCP9800. I can't
>> actually think of anything "faster" than a transistor to heat
>> up, I mean... a lamp or a resistor sounds slower to me...
> 
> Why use a seperate temp sensor? Can you not measure the Vbe drop to get a 
> measure of temperature? You already have connections to it. How absolute 
> does the temperature measurement need to be? 
> 


I'used to believe (and still am not sure) that I need 2 sensors - one 
for "free air" and one for "coupled-to-heater" measurement, in order to 
compare them and realize if a flow is going on...
And I2C is easier (and more accurate) than Analog and Vbe...


-- 

Ciao, Dario
--
Cyberdyne
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