AVR-Chat

Of course I turned off the pull-up resistor.  OK, let me check one 
more time.  Wait a minute.... PB4 is the 5th bit not the fourth.
@#$%#&%&!  Hey, now it works.
Funny how being just onnnnnnne bit off makes a difference.

Thanks Brian,


Pat

--- In AVR-Chat@yahoogroups.com, "Brian Fairchild" <b.fairchild@d...> 
wrote:
> Although you have configured the pin as an input, have you turned 
off
> the pull-up resistor?
>  
>  
> -----Original Message-----
> From: p_anglum [mailto:p_anglum@h...] 
> Sent: 22 June 2004 19:57
> To: AVR-Chat@yahoogroups.com
> Subject: [AVR-Chat] A/D to PWM
> 
> 
> I'm using a Tiny 15 to convert a 0-10 volt input to PWM output.
> I use a voltage divider (10K - 10K) to scale the 0-10 down to 0-5 
> before applying it to PB3(ADC3).
> 
> Everything seems to work except at the lowest range of input 
voltage 
> the A/D seems to always read some small voltage.  In fact, with my 
0-
> 10V input removed and only the voltage divider on the input to to 
> ADC3 I read about .9 volts on ADC3.  It appears the source of the 
> voltage is the ADC3 pin itself.  Any ideas?
> (All voltage measurements were made in refernce to pin4 - GND on 
the 
> Tiny15)
> 
> 
> 
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