AT90S2313 | AT90S8515 | ATMega | ATmega128 | ECL | FETS | IAR | Keyboard | LCD | STK50 | TMOS | UART

Hello,=0D
=0D
=0D
=0D
I am a new to Embedded world. I have chosen AVR series to work=0D
=0D
I am doing a Datalogger project.=0D
=0D
=0D
=0D
Facing a problem during the execution. =0D
=0D
I am sequentially switching the relays, measuring the ADC count & sending t=
o UART for checking purpose.=0D
=0D
I have tried my best & step by step as suggested, but still there is proble=
m.=0D
=0D
=0D
=0D
Problem : The ADC count calculation goes wrong if Timer interrupt is used.=
=0D
=0D
If Timer interrupt is not used, then ADC counts for all 24 c=
hannels are send correctly by UART via serial port.=0D
=0D
If Timer code is added, the channel1 always shows count=
=3D1, & randomly 2 channels shows wrong ADC count.=0D
=0D
=0D
=0D
Project details : 24 channel Data logger for battery system using Atmega128=
.=0D
=0D
=0D
=0D
a. 20 Batteries are connected in series to a Charger.=0D
=0D
b. We have to measure voltage of 20 batteries, current passing through t=
he battery & temperature of pilot battery.=0D
=0D
c. 2 spare channels. So 20voltage, 1 current & 1 temp. Channels.=0D
=0D
d. Relays are driven via ULN2803. Relays are connected in 8row & 3 column=
s.=0D
=0D
e. 8 rows are connected to portA & 3 columns are connected to PC4, PC5, =
& PC6.=0D
=0D
f. Voltages are switched via RL1 to RL20 & fed to ADC0. (ADC1 & sign bi=
t are not used.)=0D
=0D
g. Current is given to ADC3 via RL21. Temp. Is given to ADC2.(Measured by=
3 wire RTD).=0D
=0D
h. Max232 is used for external world communication.=0D
=0D
=0D
=0D
Software : =0D
=0D
=0D
=0D
a. AVRStudio =E2=80=93 4.13=0D
=0D
b. AVR GCC - -20070525=0D
=0D
c. For UART library of Peter Fleurry is used.=0D
=0D
=0D
=0D
Attachment : =0D
=0D
a. Circuit diagram (3 pages)=0D
=0D
b. Code in zip file.=0D
=0D
=0D
=0D
What code is doing :=0D
=0D
=0D
=0D
1. Switches on Relays 1 to 24 sequentially.=0D
=0D
2. Measure voltages appearing at ADC channels in for of ADC counts.=0D
=0D
3. Sending it the counts to UART.=0D
=0D
4. Timer interrupt used to calculate RTC in future. Presently switches on=
& off LED at one second. So interrupt at one second.=0D
=0D
5. If timer interrupt is bypassed all ADC counts are send to serial port =
correctly.=0D
=0D
6. If Timer is used ch1 always gives false ADC count reading & other any =
2 channels randomly gives wrong ADC count.=0D
=0D
=0D
=0D
I have tried my best. Did various permutations & combinations.=0D
=0D
Initially ADC was used under program control, now I have used ADC under ADC=
interrupt mode.=0D
=0D
=0D
=0D
Please help.=0D
=0D
=0D
=0D
Best regards=0D
=0D
Prashant D. Kharade=0D
=0D
Pune. India.=0D
=0D
Phone +91 9881739315=0D
=0D
=0D
=0D
=0D
=0D
=0D
=0D
=0D
=0D
From: a...@atmel.com [mailto:a...@atmel.com] =0D
Sent: 08 December 2008 19:05=0D
To: Prashant D. Kharade=0D
Subject: (ATTicket:525645) Support Form: Timer Interrupt creats problem=0D
=0D
=0D
=0D
Dear Customer,=0D
=0D
As we do not have the source code with us, we are unable to test it here. I=
n the request, what do you mean by "We are switching 24 relays & get the da=
ta." and "If we remove the interrupt all 24 counts from 24 relays are absol=
utely perfect", are you trying to get any data from the relay?=0D
=0D
We recommend to refer the device datasheet under table "ADC Conversion Time=
" in page number 235 for more details about conversion time require for ADC=
result, in the mean time if any interrupt occurs then there is a possibili=
ty for getting random values as result.=0D
=0D
We request you to try the ADC task separately first to identify any problem=
in it. If it works perfect then try the switching of relays individually. =
When both the functions works fine try to include timer counter interrupt o=
f glowing an LED. By this step by step procedures we can identify where the=
issue arrises.=0D
=0D
Even after implementing all the above mentioned instructions, if the proble=
m still persists then feel free to contact us with setup details, reference=
voltage configured, minimal running code and fuse settings.=0D
=0D
=0D
Best Regards,=0D
Srinivasan Mariappan=0D
Atmel Technical Support Team=0D
=0D
---------------------------------------------------------------------=0D
Please help us improve by rating your experience of our support on this req=
uest:=0D
http://support.atmel.no/srv.htm?sid=3D1&hc=3DK1ynnhLQsQjKhV3=0D
---------------------------------------------------------------------=0D
Support and FAQ: http://support.atmel.no/=0D
Distributors: http://www.atmel.com/dyn/general/contact.asp=0D
Atmel AVR: http://www.atmel.com/AVR/=0D
Discussion Forum: http://www.avrfreaks.net/phorum/=0D
=0D
---------------------------------------------------------------------=0D
Participate in the 2008 Atmel Customer Satisfaction Survey:=0D
http://www.atmel.com/quality_customer_survey_08/=0D
---------------------------------------------------------------------=0D
=0D
=0D
=0D
Family : AVR=C2=AE 8-Bit RISC =0D
OtherPartNumber : =0D
Part_no : ATmega128=0D
Name : Prashant=0D
Title : Engg=0D
Company : Ador Powertron Ltd.=0D
City : Pune=0D
Street : 51 DII block MIDC=0D
State : Maharashtra=0D
Country : India=0D
Postal_Code : 411027=0D
Phone : --91-9881739315=0D
Fax : =0D
Site : www.adorpowertron.com=0D
Email : p...@adorpower.com=0D
Problem : Timer Interrupt creats problem=0D
Details : We are designing a datalogger of 24 channels. We are switching 2=
4 relays & get the data. In Timer compare interrupt we are just switching o=
n/pff LED. But if the timer compare interrupt code is added the ADC counts =
are randomly varying. If we remove the interrupt all 24 counts from 24 rela=
ys are absolutely perfect. I tried 2 options. ADC under program control & A=
DC under interrupt control.But still no improvement. How can you give suppo=
rt & help. Best regards Prashant D. Kharade Ador Powertron Ltd. Pune India=
=0D
=0D
No virus found in this incoming message.=0D
Checked by AVG - http://www.avg.com=0D
Version: 8.0.176 / Virus Database: 270.9.15/1838 - Release Date: 08-12-2008=
18:16=0D
=0D
[Non-text portions of this message have been removed]
------------------------------------



(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )

it is simple. disable timer during ADC conversion is going on.

--- On Tue, 12/9/08, Prashant D. Kharade wrote:
From: Prashant D. Kharade
Subject: [AVR club] Timer Interrupt creates problem
To: a...@yahoogroups.com
Date: Tuesday, December 9, 2008, 10:28 AM

=20=20=20=20
Hello,

=20

I am a new to Embedded world. I have chosen AVR series to work

I am doing a Datalogger project.

=20

Facing a problem during the execution.=20

I am sequentially switching the relays, measuring the ADC count & sending t=
o UART for checking purpose.

I have tried my best & step by step as suggested, but still there is proble=
m.

=20

Problem : The ADC count calculation goes wrong if Timer interrupt is used.

If Timer interrupt is not used, then ADC counts for all 24 c=
hannels are send correctly by UART via serial port.

If Timer code is added, the channel1 always shows count=
=3D1, & randomly 2 channels shows wrong ADC count.

=20

Project details : 24 channel Data logger for battery system using Atmega128=
..

=20

a. 20 Batteries are connected in series to a Charger.

b. We have to measure voltage of 20 batteries, current passing through t=
he battery & temperature of pilot battery.

c. 2 spare channels. So 20voltage, 1 current & 1 temp. Channels.

d. Relays are driven via ULN2803. Relays are connected in 8row & 3 column=
s.

e. 8 rows are connected to portA & 3 columns are connected to PC4, PC5, =
& PC6.

f. Voltages are switched via RL1 to RL20 & fed to ADC0. (ADC1 & sign bi=
t are not used.)

g. Current is given to ADC3 via RL21. Temp. Is given to ADC2.(Measured by=
3 wire RTD).

h. Max232 is used for external world communication.

=20

Software :=20

=20

a. AVRStudio =96 4.13

b. AVR GCC - -20070525

c. For UART library of Peter Fleurry is used.

=20

Attachment :=20

a. Circuit diagram (3 pages)

b. Code in zip file.

=20

What code is doing :

=20

1. Switches on Relays 1 to 24 sequentially.

2. Measure voltages appearing at ADC channels in for of ADC counts.

3. Sending it the counts to UART.

4. Timer interrupt used to calculate RTC in future. Presently switches on=
& off LED at one second. So interrupt at one second.

5. If timer interrupt is bypassed all ADC counts are send to serial port =
correctly.

6. If Timer is used ch1 always gives false ADC count reading & other any =
2 channels randomly gives wrong ADC count.

=20

I have tried my best. Did various permutations & combinations.

Initially ADC was used under program control, now I have used ADC under ADC=
interrupt mode.

=20

Please help.

=20

Best regards

Prashant D. Kharade

Pune. India.

Phone +91 9881739315

=20

=20

=20

=20

From: a...@atmel.com [mailto:a...@atmel.com]=20
Sent: 08 December 2008 19:05
To: Prashant D. Kharade
Subject: (ATTicket:525645) Support Form: Timer Interrupt creats problem

=20

Dear Customer,

As we do not have the source code with us, we are unable to test it here. I=
n the request, what do you mean by "We are switching 24 relays & get the da=
ta." and "If we remove the interrupt all 24 counts from 24 relays are absol=
utely perfect", are you trying to get any data from the relay?

We recommend to refer the device datasheet under table "ADC Conversion Time=
" in page number 235 for more details about conversion time require for ADC=
result, in the mean time if any interrupt occurs then there is a possibili=
ty for getting random values as result.

We request you to try the ADC task separately first to identify any problem=
in it. If it works perfect then try the switching of relays individually. =
When both the functions works fine try to include timer counter interrupt o=
f glowing an LED. By this step by step procedures we can identify where the=
issue arrises.

Even after implementing all the above mentioned instructions, if the proble=
m still persists then feel free to contact us with setup details, reference=
voltage configured, minimal running code and fuse settings.

Best Regards,
Srinivasan Mariappan
Atmel Technical Support Team

------------ --------- --------- --------- --------- --------- -
Please help us improve by rating your experience of our support on this req=
uest:
http://support. atmel.no/ srv.htm?sid=3D 1&hc=3DK1ynnhLQsQj KhV3
------------ --------- --------- --------- --------- --------- -
Support and FAQ: http://support. atmel.no/
Distributors: http://www.atmel. com/dyn/general/ contact.asp
Atmel AVR: http://www.atmel. com/AVR/
Discussion Forum: http://www.avrfreak s.net/phorum/

------------ --------- --------- --------- --------- --------- -
Participate in the 2008 Atmel Customer Satisfaction Survey:
http://www.atmel. com/quality_ customer_ survey_08/
------------ --------- --------- --------- --------- --------- -

=20

Family : AVR=AE 8-Bit RISC=20
OtherPartNumber :=20
Part_no : ATmega128
Name : Prashant
Title : Engg
Company : Ador Powertron Ltd.
City : Pune
Street : 51 DII block MIDC
State : Maharashtra
Country : India
Postal_Code : 411027
Phone : --91-9881739315
Fax :=20
Site : www.adorpowertron. com
Email : pdkharade@adorpower .com
Problem : Timer Interrupt creats problem
Details : We are designing a datalogger of 24 channels. We are switching 2=
4 relays & get the data. In Timer compare interrupt we are just switching o=
n/pff LED. But if the timer compare interrupt code is added the ADC counts =
are randomly varying. If we remove the interrupt all 24 counts from 24 rela=
ys are absolutely perfect. I tried 2 options. ADC under program control & A=
DC under interrupt control.But still no improvement. How can you give suppo=
rt & help. Best regards Prashant D. Kharade Ador Powertron Ltd. Pune India

No virus found in this incoming message.
Checked by AVG - http://www.avg. com
Version: 8.0.176 / Virus Database: 270.9.15/1838 - Release Date: 08-12-2008=
18:16

[Non-text portions of this message have been removed]

=20=20=20=20=20=20

=20=20=20=20
=20=20=20=20
=09
=09=20
=09
=09

=09
=09
=09
=20=20=20=20=20=20

[Non-text portions of this message have been removed]
------------------------------------



(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )

Thanks Kishor Soni.
I have already put cli() instruction at start of ADC start & sei() at the e=
nd.

But still the problem comes. I am not able to identify.

Regards

Prashant D. Kharade

-----Original Message-----
From: a...@yahoogroups.com [mailto:a...@yahoogroups.com] On Behalf Of=
Kishor Soni
Sent: 09 December 2008 12:08
To: a...@yahoogroups.com
Subject: Re: [AVR club] Timer Interrupt creates problem

it is simple. disable timer during ADC conversion is going on.

--- On Tue, 12/9/08, Prashant D. Kharade wrote:
From: Prashant D. Kharade
Subject: [AVR club] Timer Interrupt creates problem
To: a...@yahoogroups.com
Date: Tuesday, December 9, 2008, 10:28 AM

=20=20=20=20
Hello,

=20

I am a new to Embedded world. I have chosen AVR series to work

I am doing a Datalogger project.

=20

Facing a problem during the execution.=20

I am sequentially switching the relays, measuring the ADC count & sending t=
o UART for checking purpose.

I have tried my best & step by step as suggested, but still there is proble=
m.

=20

Problem : The ADC count calculation goes wrong if Timer interrupt is used.

If Timer interrupt is not used, then ADC counts for all 24 c=
hannels are send correctly by UART via serial port.

If Timer code is added, the channel1 always shows count=
=3D1, & randomly 2 channels shows wrong ADC count.

=20

Project details : 24 channel Data logger for battery system using Atmega128=
..

=20

a. 20 Batteries are connected in series to a Charger.

b. We have to measure voltage of 20 batteries, current passing through t=
he battery & temperature of pilot battery.

c. 2 spare channels. So 20voltage, 1 current & 1 temp. Channels.

d. Relays are driven via ULN2803. Relays are connected in 8row & 3 column=
s.

e. 8 rows are connected to portA & 3 columns are connected to PC4, PC5, =
& PC6.

f. Voltages are switched via RL1 to RL20 & fed to ADC0. (ADC1 & sign bi=
t are not used.)

g. Current is given to ADC3 via RL21. Temp. Is given to ADC2.(Measured by=
3 wire RTD).

h. Max232 is used for external world communication.

=20

Software :=20

=20

a. AVRStudio =96 4.13

b. AVR GCC - -20070525

c. For UART library of Peter Fleurry is used.

=20

Attachment :=20

a. Circuit diagram (3 pages)

b. Code in zip file.

=20

What code is doing :

=20

1. Switches on Relays 1 to 24 sequentially.

2. Measure voltages appearing at ADC channels in for of ADC counts.

3. Sending it the counts to UART.

4. Timer interrupt used to calculate RTC in future. Presently switches on=
& off LED at one second. So interrupt at one second.

5. If timer interrupt is bypassed all ADC counts are send to serial port =
correctly.

6. If Timer is used ch1 always gives false ADC count reading & other any =
2 channels randomly gives wrong ADC count.

=20

I have tried my best. Did various permutations & combinations.

Initially ADC was used under program control, now I have used ADC under ADC=
interrupt mode.

=20

Please help.

=20

Best regards

Prashant D. Kharade

Pune. India.

Phone +91 9881739315

=20

=20

=20

=20

From: a...@atmel.com [mailto:a...@atmel.com]=20
Sent: 08 December 2008 19:05
To: Prashant D. Kharade
Subject: (ATTicket:525645) Support Form: Timer Interrupt creats problem

=20

Dear Customer,

As we do not have the source code with us, we are unable to test it here. I=
n the request, what do you mean by "We are switching 24 relays & get the da=
ta." and "If we remove the interrupt all 24 counts from 24 relays are absol=
utely perfect", are you trying to get any data from the relay?

We recommend to refer the device datasheet under table "ADC Conversion Time=
" in page number 235 for more details about conversion time require for ADC=
result, in the mean time if any interrupt occurs then there is a possibili=
ty for getting random values as result.

We request you to try the ADC task separately first to identify any problem=
in it. If it works perfect then try the switching of relays individually. =
When both the functions works fine try to include timer counter interrupt o=
f glowing an LED. By this step by step procedures we can identify where the=
issue arrises.

Even after implementing all the above mentioned instructions, if the proble=
m still persists then feel free to contact us with setup details, reference=
voltage configured, minimal running code and fuse settings.

Best Regards,
Srinivasan Mariappan
Atmel Technical Support Team

------------ --------- --------- --------- --------- --------- -
Please help us improve by rating your experience of our support on this req=
uest:
http://support. atmel.no/ srv.htm?sid=3D 1&hc=3DK1ynnhLQsQj KhV3
------------ --------- --------- --------- --------- --------- -
Support and FAQ: http://support. atmel.no/
Distributors: http://www.atmel. com/dyn/general/ contact.asp
Atmel AVR: http://www.atmel. com/AVR/
Discussion Forum: http://www.avrfreak s.net/phorum/

------------ --------- --------- --------- --------- --------- -
Participate in the 2008 Atmel Customer Satisfaction Survey:
http://www.atmel. com/quality_ customer_ survey_08/
------------ --------- --------- --------- --------- --------- -

=20

Family : AVR=AE 8-Bit RISC=20
OtherPartNumber :=20
Part_no : ATmega128
Name : Prashant
Title : Engg
Company : Ador Powertron Ltd.
City : Pune
Street : 51 DII block MIDC
State : Maharashtra
Country : India
Postal_Code : 411027
Phone : --91-9881739315
Fax :=20
Site : www.adorpowertron. com
Email : pdkharade@adorpower .com
Problem : Timer Interrupt creats problem
Details : We are designing a datalogger of 24 channels. We are switching 2=
4 relays & get the data. In Timer compare interrupt we are just switching o=
n/pff LED. But if the timer compare interrupt code is added the ADC counts =
are randomly varying. If we remove the interrupt all 24 counts from 24 rela=
ys are absolutely perfect. I tried 2 options. ADC under program control & A=
DC under interrupt control.But still no improvement. How can you give suppo=
rt & help. Best regards Prashant D. Kharade Ador Powertron Ltd. Pune India

------------------------------------



(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )

Dear Prashant,

Hmm you should put :
TCCR3B=3D0x00; // to stop Timer-3 for example, before start ADC
and put :
TCCR3B=3D0x03; // to start again Timer-3, with frequency of 125 kHz (see=
ATmega128 datasheet)
-> TCCR =3D Timer and Counter Control Register

cmiiw
-Adam

________________________________
From: Prashant D. Kharade
To: a...@yahoogroups.com
Sent: Tuesday, December 9, 2008 2:55:50 PM
Subject: RE: [AVR club] Timer Interrupt creates problem

Thanks Kishor Soni.
I have already put cli() instruction at start of ADC start & sei() at the e=
nd.

But still the problem comes. I am not able to identify.

Regards

Prashant D. Kharade

-----Original Message-----
From: a...@yahoogroups.com [mailto:avrclub@yahoogroups..com] On Behalf O=
f Kishor Soni
Sent: 09 December 2008 12:08
To: a...@yahoogroups.com
Subject: Re: [AVR club] Timer Interrupt creates problem

it is simple. disable timer during ADC conversion is going on.

--- On Tue, 12/9/08, Prashant D. Kharade wrote:
From: Prashant D. Kharade
Subject: [AVR club] Timer Interrupt creates problem
To: a...@yahoogroups.com
Date: Tuesday, December 9, 2008, 10:28 AM

=20=20=20=20
Hello,

I am a new to Embedded world. I have chosen AVR series to work

I am doing a Datalogger project.

Facing a problem during the execution.=20

I am sequentially switching the relays, measuring the ADC count & sending t=
o UART for checking purpose.

I have tried my best & step by step as suggested, but still there is proble=
m..

Problem : The ADC count calculation goes wrong if Timer interrupt is used.

If Timer interrupt is not used, then ADC counts for all 24 c=
hannels are send correctly by UART via serial port.

If Timer code is added, the channel1 always shows count=
=3D1, & randomly 2 channels shows wrong ADC count.

Project details : 24 channel Data logger for battery system using Atmega128=
..

a. 20 Batteries are connected in series to a Charger.

b. We have to measure voltage of 20 batteries, current passing through t=
he battery & temperature of pilot battery.

c. 2 spare channels. So 20voltage, 1 current & 1 temp. Channels.

d. Relays are driven via ULN2803. Relays are connected in 8row & 3 column=
s.

e. 8 rows are connected to portA & 3 columns are connected to PC4, PC5, =
& PC6.

f. Voltages are switched via RL1 to RL20 & fed to ADC0. (ADC1 & sign bi=
t are not used.)

g. Current is given to ADC3 via RL21. Temp. Is given to ADC2.(Measured by=
3 wire RTD).

h. Max232 is used for external world communication.

Software :=20

a. AVRStudio =96 4.13

b. AVR GCC - -20070525

c. For UART library of Peter Fleurry is used.

Attachment :=20

a. Circuit diagram (3 pages)

b. Code in zip file.

What code is doing :

1. Switches on Relays 1 to 24 sequentially.

2. Measure voltages appearing at ADC channels in for of ADC counts.

3. Sending it the counts to UART.

4. Timer interrupt used to calculate RTC in future. Presently switches on=
& off LED at one second. So interrupt at one second.

5. If timer interrupt is bypassed all ADC counts are send to serial port =
correctly.

6. If Timer is used ch1 always gives false ADC count reading & other any =
2 channels randomly gives wrong ADC count..

I have tried my best. Did various permutations & combinations.

Initially ADC was used under program control, now I have used ADC under ADC=
interrupt mode.

Please help.

Best regards

Prashant D. Kharade

Pune. India.

Phone +91 9881739315

From: a...@atmel.com [mailto:a...@atmel.com]=20
Sent: 08 December 2008 19:05
To: Prashant D. Kharade
Subject: (ATTicket:525645) Support Form: Timer Interrupt creats problem

Dear Customer,

As we do not have the source code with us, we are unable to test it here. I=
n the request, what do you mean by "We are switching 24 relays & get the da=
ta." and "If we remove the interrupt all 24 counts from 24 relays are absol=
utely perfect", are you trying to get any data from the relay?

We recommend to refer the device datasheet under table "ADC Conversion Time=
" in page number 235 for more details about conversion time require for ADC=
result, in the mean time if any interrupt occurs then there is a possibili=
ty for getting random values as result.

We request you to try the ADC task separately first to identify any problem=
in it. If it works perfect then try the switching of relays individually. =
When both the functions works fine try to include timer counter interrupt o=
f glowing an LED. By this step by step procedures we can identify where the=
issue arrises.

Even after implementing all the above mentioned instructions, if the proble=
m still persists then feel free to contact us with setup details, reference=
voltage configured, minimal running code and fuse settings.

Best Regards,
Srinivasan Mariappan
Atmel Technical Support Team

------------ --------- --------- --------- --------- --------- -
Please help us improve by rating your experience of our support on this req=
uest:
http://support. atmel.no/ srv.htm?sid=3D 1&hc=3DK1ynnhLQsQj KhV3
------------ --------- --------- --------- --------- --------- -
Support and FAQ: http://support. atmel.no/
Distributors: http://www.atmel. com/dyn/general/ contact.asp
Atmel AVR: http://www..atmel. com/AVR/
Discussion Forum: http://www.avrfreak s.net/phorum/

------------ --------- --------- --------- --------- --------- -
Participate in the 2008 Atmel Customer Satisfaction Survey:
http://www.atmel. com/quality_ customer_ survey_08/
------------ --------- --------- --------- --------- --------- -

Family : AVR=AE 8-Bit RISC=20
OtherPartNumber :=20
Part_no : ATmega128
Name : Prashant
Title : Engg
Company : Ador Powertron Ltd.
City : Pune
Street : 51 DII block MIDC
State : Maharashtra
Country : India
Postal_Code : 411027
Phone : --91-9881739315
Fax :=20
Site : www.adorpowertron. com
Email : pdkharade@adorpower .com
Problem : Timer Interrupt creats problem
Details : We are designing a datalogger of 24 channels. We are switchin=
g 24 relays & get the data. In Timer compare interrupt we are just switchin=
g on/pff LED. But if the timer compare interrupt code is added the ADC coun=
ts are randomly varying. If we remove the interrupt all 24 counts from 24 r=
elays are absolutely perfect. I tried 2 options. ADC under program control =
& ADC under interrupt control.But still no improvement. How can you give su=
pport & help. Best regards Prashant D. Kharade Ador Powertron Ltd. Pune Ind=
ia

------------------------------------

______________________________
controlSUITE™ software. Comprehensive. Intuitive. Optimized.
Real-world software for real-time control. Details Here!


(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )