Does somebody already made something with a NTC in it.
I like to build a NTC controlled fan circuit, but need a schematic and source to read a 47 KOhm NTC resistor.
NTC resistor
Does somebody already made something with a NTC in it.
I like to build a NTC controlled fan circuit, but need a schematic and source to read a 47 KOhm NTC resistor.
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I gave up on this approach and used a digital temp sensor instead. A lot less hassle.
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NL2TTL,
What pic are you using?
I use a 10K NTC thermistor, 10K fixed resistor voltage divider connected to an analog input on a 16F819. I get approximately 6 counts per degree F resolution.
I also use the hardware PWM to control 400 watts of fan motors based on temperature.
I also recommend Darrel Taylor's averaging routine. It works great!
http://www.pbpgroup.com/modules/wfse...hp?articleid=7
Mark
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I'm using a NTC because the costs are lower, and the PIC i'm using is a 16F877.
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NL2TTL,
What are you trying to acheive?
What temperature range are you planning to control?
Do you plan on using PWM?
35 degrees C Off
40 degrees C 50% duty factor
45 degrees C 70% duty factor
50 degrees C 70% duty factor
65 degrees C 100% duty factor
Mark
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yes something like that, only a resistor (NTC) is not liniar so to compensate that you have to use a formula.
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Why not have a look at AN685 from Microchip. It's about Thermistors in Single Supply Temperature Sensing Circuits.
Dave Purola,
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