<br><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; ">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.<div>
<br></div><div>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.</div><div><br></div><div>Best regards</div><div><br></div>
<div>José</div></span><div class="gmail_quote">2009/11/12 <span dir="ltr"><<a href="mailto:martin.peach@sympatico.ca">martin.peach@sympatico.ca</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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The microcontroller in the Arduino has a single sampling capacitor that can be connected to any one of the analog pins.<br>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).<br>
The cap is not discharged by the analog-to-digital conversion process or between samples except through leakage.<br>If no charge is available on the pin the capacitor will continue to slowly drain its charge from the previous sample.<br>
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.<br><br>
Martin<br><br><br>> Date: Thu, 12 Nov 2009 18:02:05 +0100<br>> From: <a href="mailto:altern2@gmail.com" target="_blank">altern2@gmail.com</a><br>> To: <a href="mailto:pd-list@iem.at" target="_blank">pd-list@iem.at</a><br>
> Subject: [PD] arduino problem with analog sensors<div><div></div><div class="h5"><br>> <br>> hi<br>> <br>> not a PD question I guess... i dont know much of electrical stuff. i am <br>> connecting two analog sensors to the arduino. One is a pressure sensor <br>
> and the second a potentiometer, they are both from an old icube.<br>> <br>> i noticed that when i raise the potentiometer (analog pin 5) the <br>> pressure sensor (analog pin 2) reports values ranging 0 to ~0.16 <br>
> increasing together as the potenciometer goes up. It is like some kind <br>> of residual noise comming from pin 5 that goes into pin 0.<br>> <br>> the power cables of both sensors go together to 5v inlet of the arduino <br>
> and the ground cables go to ground pin, each of the data cable goes to <br>> its separate analog pin.<br>> <br>> I am using arduino from Pure Data extended using latest Firmata, so i am <br>> just filtering out any value smaller than 0.16 coming from analog pin 0.<br>
> <br>> is there anything I am doing wrong? or is this normal?<br>> <br>> thanks<br>> <br>> enrike<br>> <br>> _______________________________________________<br>> <a href="mailto:Pd-list@iem.at" target="_blank">Pd-list@iem.at</a> mailing list<br>
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