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ADC, DAC and SENSOINTERFACING IN AVRMICROCONTROLLER

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TOPICS

What is ADC and why do we need it?

ADC Major Characteristics.

ADC in AVR.

Hardware Consideration.

AVR ADC Programming

ADCH and ADCL

ADMUX

ADCRA

DAC.

igna! Conditioning and ensors.

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What is ADC and Why Do We Nee

We!!" a!! the info!ation in ea" wor!d is #rin ana"o# fo!" $%t a microcontro!!er is a d#rocessing de&ice which can #rocess on!y disigna!s hence" there is a need to con&ertin'ormation #resent in ana!og 'orm to its

corres#onding digita! 'orm. (his #%r#ose is s$y ADC )ana!og to digita! con&erter*.

(he in'ormation 'rom the rea! wor!d is sensede&ice ca!!ed as +,-R.

(here are dierent ty#e o' sensors a&ai!a$!e

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&LOC' DIAGRAM fo A(DCon)esion*

The a+o)e Fi#%e e$esents a Mioonto""eonnetion to senso )ia an ADC*

This is an - &it ADC +"o. dia#a!*

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A(D Wo.in#

(he ADC con&erts an ana!ogin#%t &o!tage to a /01$it dig&a!%e thro%gh s%ccessi&e

a##ro2imation.

(he minim%m &a!%e re#rese

3,D and the ma2im%m &a!%

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ADC Ma/o Chaateist

Con&ersion (imeReso!%tion

Para!!e! &s eria!

6n#%t Channe!s

Ste$ Si0e

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ADC Si#na"s In Gene

Stat of

Con)esion

Channe" Se"eto

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ADC In AVR

At!e#a 12(34 ha)e intena" A

- ana"o#%e in$%t hanne"

5 di6eentia" in$%t hanne"

4 di6eentia" in$%t hanne"7ith 189 o 4889 #ain

3 so%e of

Intena" eneato

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:ad7ae Consideatio

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ADC: and ADCL Data e#is

ADCH8ADCL store the res%!ts o

(he /0 $it res%!t can $e right

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ADM;< =;se S"idesho7 To Vie

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ADCSA

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ADC Pesa"a =;se S"idesho7 To Vie7

Preca!er 5its !et %s change the c!oc: 're;%ency o' AD

(he 're;%ency o' ADC sho%!d not $e more than

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Po#a!!in# The ADC

/. Ma:e the #in 'or the se!ected ADC channe! an in#%t #in.

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DAC Di#ita" To Ana"o# Con)et

What is DAC ?

How to connect an DAC to AVR?

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Si#na" Conditionin#

The!o o%$"e $o)ides te!$ in

fo! of %V

PT188 $o)ides te!$ in fo! ofesistane

So!e h%!idity senso $o)ide the

es%"t in fo! of Ca$aitane

@ We ha)e to han#e these si#na"sto Vo"ta#e to on)et it +y ADC

This /o+ is a""ed si#na"onditionin#*

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Senso Intefain#

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Than.

Bo%