[En-Nut-Discussion] No voltage at ADC VCC

[Daniel]

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
>
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