## Re: [booksbybibin,www.booksbybibin.tk] Re: LM35 +ADC0804

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• Thanks. Can you recommend another sensor which we can interface in the computer aside from LM35? We don t have TMP121 or DS1620 temperature in the Philippines
Message 1 of 10 , Feb 14, 2008
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Thanks. Can you recommend another sensor which we can interface in the computer aside from LM35? We don't have TMP121 or DS1620 temperature in the Philippines so we are really working hard with the LM35 to function. We are working with this original circuit (attached here) but the computer cannot accept the data from the sensor:

Can you suggest any alternative way to solve this problem? Thank you very much and God bless..

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• Hi. rango de temperatura = 120 -30 = 90 resolucion del ADC ( 8 bits) = 5/255= 0.0196 resolucion del ADC/grado = 5/90= 0.0556 Entonces la exactitud es =
Message 2 of 10 , Feb 14, 2008
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Hi.
rango de temperatura   = 120 -30 = 90
resolucion del ADC ( 8 bits) = 5/255= 0.0196

Entonces  la exactitud es = 0.0196/0.0556 = 0.35 grados,

por lo tanto necesitas un conversor ADC minimo  de 10bits que esta en un ATMEGA, Si usas de 12 bits mejoras la resolucion de tus medidas.
No olvidar usar los OPAMs para cambiar la referencia de 0 -90 grados

saludos

Ever

angelbein <angelbein@...> escribió:
Hi. I am designing a circuit that accepts temperature data using
LM35dz and ADC0804 through visual basic. But we want the data to be in
the range of 30°C to 120°C. However, we also want it to give
temperature data with decimal point. How can we calibrate the adc to
output at least 0.2°C accuracy? Thanks in advance..

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• Hi, thanks for sharing the circuit. Did you use the status port of the parallel port or the data port of it? I will have to read your article for further
Message 3 of 10 , Feb 15, 2008
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Hi, thanks for sharing the circuit.

Did you use the status port of the parallel port or the data port of it? I will have to read your article for further information. Did you also program it using Visual Basic 6.0?

Thanks again..

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• Muchas gracias Señor pero no entiendes español. I understand a little bit of your language because it s quite similar with our language here in the
Message 4 of 10 , Feb 15, 2008
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Muchas gracias Señor pero no entiendes español.
I understand a little bit of your language because it's quite similar with our language here in the Philippines. Anyway, I just want to clarify what you've said and translate it in English to see if I'm correct.

Range of Temperature = 120 - 30 °C
Resolution of ADC( 8 bits) = 5/255= 0.0196

Entonces  la exactitud es = 0.0196/0.0556 = 0.35 grados, (I can't understand what this means sir. Where and how can I set these parameters in the ADC?)

Thanks.

Ever Cifuentes <ever_cifuentes@...> wrote:
Hi.
rango de temperatura   = 120 -30 = 90
resolucion del ADC ( 8 bits) = 5/255= 0.0196

Entonces  la exactitud es = 0.0196/0.0556 = 0.35 grados,

por lo tanto necesitas un conversor ADC minimo  de 10bits que esta en un ATMEGA, Si usas de 12 bits mejoras la resolucion de tus medidas.
No olvidar usar los OPAMs para cambiar la referencia de 0 -90 grados

saludos

Ever

angelbein <angelbein@yahoo. com> escribió:
Hi. I am designing a circuit that accepts temperature data using
LM35dz and ADC0804 through visual basic. But we want the data to be in
the range of 30°C to 120°C. However, we also want it to give
temperature data with decimal point. How can we calibrate the adc to
output at least 0.2°C accuracy? Thanks in advance..

¿Con Mascota por primera vez? - Sé un mejor Amigo
Entra en Yahoo! Respuestas.

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