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Using LM74 Temperature Sensor with a PIC18F4525

 
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DarrenH



Joined: 25 Jun 2007
Posts: 2

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Using LM74 Temperature Sensor with a PIC18F4525
PostPosted: Wed Jul 25, 2007 5:12 am     Reply with quote
I'm using a National Semiconductor Temperature Sensor LM74 using the Microwire interface to a PIC18F4525, using the following pins:

TEMP_CLK - PIN_E2
TEMP_DATA - PIN_E1
TEMP_CS - PIN_E0

I'd like to read the temperature at regular intervals to control 2 Fans that will run at nominal and high speed. If the temperature is between 40 to 60 degrees C for example, I will run the Fans at 50% duty cycle. If the Temperature is above 60 degrees C, I will run the fans at 80-90% duty cycle. The code for PWM generation of the Fans is working fine.

Does anyone have any working code using the temperature sensor LM74?

Regards,

Darren
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jul 25, 2007 11:46 pm     Reply with quote
The LM74 is similar to the Microchip TC77. Here's a software driver
that someone posted. It should get you started.
http://www.ccsinfo.com/forum/viewtopic.php?t=30038&highlight=tc77
DarrenH



Joined: 25 Jun 2007
Posts: 2

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PostPosted: Thu Jul 26, 2007 5:13 am     Reply with quote
Ok thank you, I'll give that a try.

Regards,

Darren
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