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temperature logging system
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abbas1707
Wed Aug 08 2007, 03:40AM

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hi ajay,
im working on data logger project. first im working at proteus .
i cant find simulation model for adc0848 on proteus7.i need it badly.
plz tell me what to do where to find it



[ Edited Sat Aug 25 2007, 08:33AM ]
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Ajay
Wed Aug 08 2007, 04:09AM
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you can try out with a similar kind of ADC, as this model is not there for simulation. see what properties are there in ADC0848 find a similar one with simulation model in proteus and at least finish your project
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abbas1707
Wed Aug 08 2007, 04:18AM

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thankx for ur reply.
i have done it using adc0808.
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abbas1707
Thu Aug 09 2007, 04:42PM

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hi rickey,
im facing problem with adc0808 on proteus.it is not giving correct reading.actually i consulted mazide book.
according to Mazide when we apply VREF= 2.56v and vin=0-->2.56v then the step size is 10mv.
it means when i give analog signal of .26v as vin number of steps shown should be 26 but adc0808 is showing 88 steps
can u plz help me solving this problem.also i have reinstalled proteus but the same thing happening.plz help me Cry Cry
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Ajay
Fri Aug 10 2007, 03:46AM
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can you show me the circuit that you've made? i want to see the circuit arrangement.
As far as you told me, it must show 26 steps. rest i can only tell when i see your circuit.
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abbas1707
Fri Aug 10 2007, 03:55AM

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here are the files
1186743328_383_FT1501_data_logger.zip
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abbas1707
Fri Aug 10 2007, 04:32AM

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ajay i have solved the problem
i was making a big mistake


[ Edited Fri Aug 10 2007, 04:39AM ]
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Ajay
Fri Aug 10 2007, 04:35AM
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I checked your cirucit, its perfectly fine..
then i checked your program.. it has little mistake. The data you are getting from the ADC output will be hex value, so.. you cannot directly send it to the terminal.
for example.. as you said for 260mV i/p the o/p should be 26 steps.. that means the ADC o/p will be 0x1A
so when you convert it to decimal you will get 26. and then display it
have fun programming
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abbas1707
Fri Aug 10 2007, 04:49AM

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but i have solved by changing the circuit
actually OUT1 is the MSB and i was taking it as LSB (very funny na). i didnt changed the program a little bit.
and now reading are perfect
thanks for ur help

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Ajay
Fri Aug 10 2007, 05:05AM
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lol even i didn't check it..
and i thought you're not changing hex to decimal anyways happy it worked
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