A huge thank you! I Knew just connecting the variable resistor to adc pin and ground seemed like not the best choice, but didn't know about voltage divider (as I am quite new to electronics) With 10 kohm resistor in voltage divider it just worked (I got readings of approx 2000 while the variable resistor vas strainght (~10kohm) and approx 3700 when it was bent (~25kohm) So for this particular use it works well enough, but because I would also like to get a bit smarter - could you explain how the impedance of ADC input you mentioned affects the whole thing? And how do I measure it - with multimeter on ADC/ground pins? Also If I understand correctly - then simply connecting the ADC to ground should not have worked at all? And the voltage that I was reading - that came as a feedback from the ground wire then?
Thanks again! On Tue, Nov 9, 2010 at 1:31 AM, Michael Schippling <[email protected]> wrote: > Less than an order of magnitude off... > Not bad for failing memory circuits. > I think the ATMEGA might have been around 250K. > Or maybe the 165f818 PIC... > MS > > > Yong, Chee Yeew wrote: >> >> Not being a lot of help here, but I measured / calculated the input >> impedance of the MDA300 ADC input recently, and it gave me 500kOhms. >> > -- ---------------------------------- Krišjānis Nesenbergs _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
