thanks to everyone for the answers!
Jose Luis Santorcuato(e)k dio:
Hi, maybe the potentiometer need a resistor,... if the potentiometer is a 10
kohms maybe yo need a resistor, i prefer work with 50 kohms potentiometers.
Using a protoboard, you must connect a general ground and general voltage,
the wire to analog is the middle wire, check the pwm or outputs are closed.
Best regards
José
2009/11/12 <martin.pe...@sympatico.ca>
The microcontroller in the Arduino has a single sampling capacitor that
can be connected to any one of the analog pins.
It will charge up to the voltage on the pin if enough charged particles are
available on the pin (or a path less than about 10kohm exists to a source of
current).
The cap is not discharged by the analog-to-digital conversion process or
between samples except through leakage.
If no charge is available on the pin the capacitor will continue to slowly
drain its charge from the previous sample.
It's normal and harmless unless you are in a high-voltage environment like
a thunderstorm or a nylon carpet, where much more than 5V could accumulate
on an open pin. Then it's best to ground unused inputs.
Martin
Date: Thu, 12 Nov 2009 18:02:05 +0100
From: alte...@gmail.com
To: pd-list@iem.at
Subject: [PD] arduino problem with analog sensors
hi
not a PD question I guess... i dont know much of electrical stuff. i am
connecting two analog sensors to the arduino. One is a pressure sensor
and the second a potentiometer, they are both from an old icube.
i noticed that when i raise the potentiometer (analog pin 5) the
pressure sensor (analog pin 2) reports values ranging 0 to ~0.16
increasing together as the potenciometer goes up. It is like some kind
of residual noise comming from pin 5 that goes into pin 0.
the power cables of both sensors go together to 5v inlet of the arduino
and the ground cables go to ground pin, each of the data cable goes to
its separate analog pin.
I am using arduino from Pure Data extended using latest Firmata, so i am
just filtering out any value smaller than 0.16 coming from analog pin 0.
is there anything I am doing wrong? or is this normal?
thanks
enrike
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