is it possible to do this without a microcontroller?

I would like to use lm34 with 4 digit 7 segment display.
looked around and i know i need an analog digital converter. But if that's all i need, why do i need a full microcontroller like some of the projects out there?

 

Just get a voltmeter with those specs.

Example (not an endorsement!)

If you need to scale it differently, you could add an op-amp circuit in between, to convert the LM34 output into a different voltage range.

 

not quite what im looking for... whole point is to make it myself
i guess i'll stick with the microcontroller..

thanks

 

not quite what im looking for... i guess i'll stick with the microcontroller..

That's the way the world is going right now. Better to program a microcontroller than to learn how to fit two ICs to a display driver.

 

How about an ICL7106 or 7107?

 

I am corrected. Fit one IC to a display.

 

it needs many discrete parts and the display must match

 

is it possible to do this without a microcontroller?

I would like to use lm34 with 4 digit 7 segment display.
looked around and i know i need an analog digital converter. But if that's all i need, why do i need a full microcontroller like some of the projects out there?

Among other tings, the microcontroller converts the straight binary out of the A/D to binary-coded decimal (BCD) for the displays. The output of a typical A/D converter is a single word of 8 to 16 bits that represents the analog value in straight binary. A multi-digit display needs 3 or 4 bits for each digit to display the values 0-9. For example, a 12 bit A/D can output binary values that represent to 4095 in decimal. To drive 4 decimal digits takes 15 bits in BCD.

As noted above, there are BCD-coded A/D converters specialized for the digital panel meter market. With an opamp or two for buffering and scaling, they will do exactly what you want.

ak

 

http://www.datasheetarchive.com/files/intersil/device_pages/faq_5114-v1.html

 

is it possible to do this without a microcontroller?

I would like to use lm34 with 4 digit 7 segment display.
looked around and i know i need an analog digital converter. But if that's all i need, why do i need a full microcontroller like some of the projects out there?

Should be possible. LM35 output 10mV per degree C, i.e. 1000mV = 100°C. But then just the ADC chip alone would cost many times more than a cheap PIC uC. Not to mention the convert-display logics to convert Binary to BCD and decode them to 7 segments displays.

A cheap 16F 18-pin PIC would cover all of that provided you already know how to use it.

Allen

 

is it possible to do this without a microcontroller?

I would like to use lm34 with 4 digit 7 segment display.
looked around and i know i need an analog digital converter. But if that's all i need, why do i need a full microcontroller like some of the projects out there?

The CA3161/CA3162 is good for 3 digits, which should do for most things.
But they may be as scarce as the ICL voltmeter IC's and hence carry a ridiculous price tag

 

is it possible to do this without a microcontroller?

I would like to use lm34 with 4 digit 7 segment display.
looked around and i know i need an analog digital converter. But if that's all i need, why do i need a full microcontroller like some of the projects out there?

You can get a simple panel meter. Some panel meters can be configured to place the decimal where needed for a given input range. All for 5 to $20 - depending on quality and store.