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How to interface output of LM35 to LPC2148?

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supi

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I want to interface output of LM35 to channel of on-chip ADC of LPC2148. How should i do it? I will require to use amplifier no? Please help. I have looked at formulae from some forums.
 

Re: LM35 and LPC2148

Hi,

If you install an evaluation version of Keil IDE.. you have the ADC Interfacing codes in the example folder.. I think the project name is Measure.uv2

You could get an idea from that.

check this link for some LPC2148 demo code

https://www.jcwren.com/arm/

also this link

HELP ADC in ARM7 lpc2148
[/url]
 

Re: LM35 and LPC2148

supi said:
I want to interface output of LM35 to channel of on-chip ADC of LPC2148. How should i do it? I will require to use amplifier no? Please help. I have looked at formula from some forums.
Click to expand...

It is a 10 bit ADC, without using any amplifier u can directly connect lm35 to lpc2148
input channels, it is better to connect a low value resister(1kor near 1 k) between out put and ground of lm35.
in LM35 1 degree 10 mv out will get.
the reference voltage of ADC is 3.3v(or 2.2), 3.3/1024 = 1 step

so for 1 degree 10 mv out put from LM35, in 10 mv out ADC has almost 4 steps.

for getting temperature in degree, wt ever ur adc value ur getting just divide it by 4
then u will get temperature in degree.
 

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