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Digital thermometer using microcontroller

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gaya_pink

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circuit diagram digital thermometer

hi all,

I want to know the circuit diagram for a digital thermometer using microcontrollers.. can anyboby give me a simple diagram??
 

thermometer microcontroller

you need to know what kind of resistor you will use NTC or PTC ... ?? but a simpel block diagram would be like this.:

 

block diagram of digital thermometer

well thank u but v need sensor to detect the temperature na??
 

circuit diagram of digital thermometer

gaya_pink said:
well thank u but v need sensor to detect the temperature na??
Click to expand...




Dear gaya_pink,

You ask for diagram, that what you get!!
If you look (maybe with magnifies glass) you can see NTC or PTC (Negative Temperature Coefficient resistor, Thermistor) or (Positive temperature coefficient resistor).
All the answers you can find on the net if you look all need bit of work (just looking on the net). Nothing is for free.

You can check this link - https://en.wikipedia.org/wiki/Main_Page

But if you do your work I believe anyone will help.

Hugo
 

digital thermometer project using microcontroller

which controller you are using ??


if it contains an internal ADC you just need a temperature sensing ic like lm35d
and if your controller doen't have any ADC you need to have an ADC ic like ADC0804
communicate between them and you will get the temperature.
 

lm35d circuit

gaya_pink said:
well thank u but v need sensor to detect the temperature na??
Click to expand...

yes, but when you use a constant current, you need to know the NTC/PTC curve values ... for example, you need to know the 25degree tempuratur ohmsk value, typical 1000ohms.

so if use 1mA constant current you will get 1V over the NTC/PTC, wiht 25degrees.

but use as sau_sol says, a IC to measure temp, and use a chip wiht internal ADC, for example a MicroChip PIC16F874 !!

but you still need two find out what you want to use NTC or PTC ...
 

digital thermometer using 8051

LM35d is a simple transistor type IC for measuring temperature having 3 pins

1. supply
2. output voltage
3. gnd

it give an increase in 10mV for 1 degree Centigrade rise in temperature

so if your controller have an internal ADC as in PIC and AVR controllers you can use them
or you can use an external ADC ic

the problem is for first time you need to calibrate your lm35d
i.e. you have to check the room temperature and feed in the controller for further calculations
making this value as a reference for the temperature
 

digital thermometer using microcontroller

gaya_pink said:
hi all,

I want to know the circuit diagram for a digital thermometer using microcontrollers.. can anyboby give me a simple diagram??
Click to expand...
 

thermometer block diagram

**broken link removed**

check this link you will get all the information
 

thermometer using adc circuit

I also have an on-going project (digital thermometer)
v7gl79.jpg

digital thermometer using Z8F082A
I'm using an mcu with internal temperature sensor :D
 

here is the simple **broken link removed**
 

Just for information, maybe someone will find it helpful, like the Zilog Z8F082A, there are quite a few Atmel AVRs with on-chip temperature sensor.

Hope this helps someone.
Tahmid.
 

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