No voltage at ADC VCC

[Daniel-378]

Hello,

I'm using an Ehternut 1.3H.
I cannot measure the voltage supply at the ADC Connector(Port F) between
VCC(Pin 1 or Pin 3) and GND(Pin 4). But I get my 5 volts if I measure
between the resistors R13(between VCC and Pin 1/3) and R15(between GND
and Pin 4).

Do I have a failure in the hardware? And if there is a failure, can I
use the ADC inputs furthermore?

Best regards.
Daniel
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[Ethernut]

Daniel wrote:

> I'm using an Ehternut 1.3H.
> I cannot measure the voltage supply at the ADC Connector(Port F) between
> VCC(Pin 1 or Pin 3) and GND(Pin 4). But I get my 5 volts if I measure
> between the resistors R13(between VCC and Pin 1/3) and R15(between GND
> and Pin 4).

Hi Daniel,

Please let me know where you got this info from. It's obviously wrong.

Please check the schematics. Pin 4 is unconnected. Ground is available
at 6, 8, 10...20.

Also note, that you either need to

1. apply a reference voltage at pin 2
2. or place a jumper to pin 1-2 to use the 5V supply as a reference
3. or enable the internal reference (see the ATmega128 datasheet)

For your software
http://www.ethernut.de/nutwiki/Analog_Input
may be helpful.

Harald

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[Daniel-378]

Hi Harald,

It's from the pdf "enut130g-s1.pdf" from the ethernut website. I didn't
find a document special for 1.3H.

Can I attach files to this mailing list?

Daniel

Harald Kipp schrieb:

> Daniel wrote:
>
>  
>> I'm using an Ehternut 1.3H.
>> I cannot measure the voltage supply at the ADC Connector(Port F) between
>> VCC(Pin 1 or Pin 3) and GND(Pin 4). But I get my 5 volts if I measure
>> between the resistors R13(between VCC and Pin 1/3) and R15(between GND
>> and Pin 4).
>>    
>
> Hi Daniel,
>
> Please let me know where you got this info from. It's obviously wrong.
>
> Please check the schematics. Pin 4 is unconnected. Ground is available
> at 6, 8, 10...20.
>
> Also note, that you either need to
>
> 1. apply a reference voltage at pin 2
> 2. or place a jumper to pin 1-2 to use the 5V supply as a reference
> 3. or enable the internal reference (see the ATmega128 datasheet)
>
> For your software
> http://www.ethernut.de/nutwiki/Analog_Input
> may be helpful.
>
> Harald
>
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion
>
>  

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