Incoming voltage should not exceed the voltage reference.
Instead of using a reference voltage, use AVcc as the high rail for
the sampling period.
-Joe
On 12/14/06, Mikael Ifversen <[EMAIL PROTECTED]> wrote:
Is the AVcc always max available voltage output approx 3v?
If I want to read values from a flex sensor the flow is AVcc to Flex to
(Voltage divider) Vout = ADC0? Do I need an Op Amp?
Does R2 from the Voltage divider go to the 9-pin on expansion connector?
If Vref is at 1.5v, incoming voltage at ADC0 should not succeed that?
Thanks,
Mikael
Joe Polastre wrote:
> The voltage of A0 as a 12-bit number where 0 represents 0V and 4095
> represents 1.5V.
>
> -Joe
>
> On 12/14/06, Mikael Ifversen <[EMAIL PROTECTED]> wrote:
>> Hi,
>> What voltage should I expect by meassuring AVcc and ADC0 with following
>> enum in TelosADC:
>> enum
>> {
>> TOS_ADC_FLEX_PORT = unique("ADCPort"),
>> TOSH_ACTUAL_ADC_FLEX_PORT = ASSOCIATE_ADC_CHANNEL(
>> INPUT_CHANNEL_A0,
>> REFERENCE_VREFplus_AVss,
>> REFVOLT_LEVEL_1_5
>> ),
>> };
>> Mikael
>>
>> _______________________________________________
>> Tinyos-help mailing list
>> Tinyos-help@Millennium.Berkeley.EDU
>> https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>>
>
> .
>
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