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C program for adc in atmega16...?


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narenreg

Fri Sep 12 2008, 09:09AM

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hi frienz...!

i want to know what for are the bits ADATE & ADIE in register ADCSRA
i also want C-prog for using ADC...
can some one help me...

Ajay

Fri Sep 12 2008, 11:27AM

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nerenreg, please take a look at datasheet of atmega 16 for information on bits, if you still cant understand then please tell us.

and regarding C program, i again suggest to take a look at datasheet. will help you out.

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pdi33

Fri Sep 12 2008, 11:45AM

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Joined: Mon Jun 04 2007, 09:28AM

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hi naren,
if u see the datasheet for ATmega16, u will find a good explaination for the above mentioned bits:

As mentioned above , adate bit when set initiates free running mode of the ADC i.e. the ADC updates the ADCH/ADCL registers continuously with every conversion. note that u have to start the conversion cycle by setting the ADSC bit once.
the ADIE bit when set enables the ADC interrupt which will occur after each conversion. u can use this interrupt to read the ADC value.
Important Note:
I had observed a strange problem regarding the ADC readings ( some non-linearityin the ADc readings w.r.t. the input voltage) in the past when experimenting with the ADC part .This had occured because of the following condition:
1. the internal pullups were enabled and
2. in some other part of the code i had set the PA0 bit to 1.
in this case if the ADC selected is ADC0 ( this pin has dual functionality as it can be configured also as PA0). here note that the portA is not disconnected completely even when the uC is usng the pin as an ADC input. so a logic 1 to that pin initiated an internal voltage divider with the input creating the non-linearity error @ lower ADC input values.
there are two ways to eliminate this error the first one is to disable the internal pullups so that any logical level of the corresponding portA bit does not affect the ADC OR just keep the corresponding port bit to logical 0 level.
these suggestions have been thoroughly checked by me and the linearity found was excellent(upto +/- 1 LSB).

do start something by designing a circuit first and try to write some code and post them here. I can assure u we wil guide u further as u proceed.
goodluck.

* inspired to develop,developing to inspire *

This post has been thanked 3 times

narenreg , 1nafar , sashijoseph

1nafar

Sat Sep 13 2008, 11:41AM

Registered Member #10613

Joined: Sat Sep 13 2008, 07:33AM

Posts: 20
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hi
if you need a project of adc , tell me

i am amateur in english language
I beg your pardon


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love u all please i need a pdf text on microncontroller using c language, thanks.
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shazy | 09 Jan : 04:31

sir Ajay,can u help me regarding this problem, plzzzz

i need the trraffic light controller code along with comments, so that i can proceed what does it do, after two days i will present my project. plz send me as soon as possible, i'll b very thankful 2 u. i m waiting 4 ur reply.

shazy | 09 Jan : 04:28

hi abhinav, r u a student ?

shazy | 09 Jan : 04:16

for Mr. binu, sir i need the trraffic light controller code along with comments, so that i can proceed what does it do, after two days i will present my project. plz send me as soon as possible, i'll b very thankful 2 u. i m waiting 4 ur reply.

Ajay | 09 Jan : 01:50

thats ok.. i replied to your post. do check it

AbhinavChaurey | 09 Jan : 01:49

i will remember it next time sorry for this time.

Ajay | 09 Jan : 01:41

well there is no limit, but its better to stick to single thread till your problem is different. Like now you have posted in a new thread whereas it could be done in the previous thread only.

AbhinavChaurey | 09 Jan : 01:39

Good night to u all see u tomoro:bye

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