This is a multi-part message in MIME format. ------=_NextPart_000_02AC_01C515BD.58497AE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit The point of an encoder is encoding the position of a shaft with minimal hardware expense. Optical encoders are fine, but the ones that give an absolute position tend to be fairly expensive. Homemade versions can use quadrature and vernier methods to gain accuracy at very low cost, but without absolute position: http://www.massmind.org/io/sensor/pos/enc/quadrature.htm http://www.massmind.org/new/letter/news0312 Originally the device I linked to looked good, but appears to be fairly expensive as well. The basic heart of the device (an analog hall effect sensor) is better than $10 and would still need a uC to correct the signal, etc... After reading the appnote for that base device, I was inspired by their description of a magnetic coil pickup and a recent interest my son had in metal detectors. I wondered if a very basic metal detector couldn't be used to measure the distance of an arm attached to the motor shaft. A uC could manage automatic calibration based on minimum and maximum signal and signal correction to provide an angular measurement. The base component cost for a BFO metal detector is pennies. http://home.clara.net/saxons/bfo.htm is probably more than needed, I've attached a less complex version. The coil could be small since the metal is very close. The beat frequency is audio and so well within the sampling range of a PIC or SX. Given sufficient drive, the signal should be strong enough to trigger a digital input; no A2D required since we are only interested in the frequency. The BFO has two coils, in a metal detector, one is the reference and the other is the "search" coil which is actually held to the ground to detect metal. In this application, one coil can be placed at 90' to the other so that as the arm passes closer to one than the other, the variation is twice what it would be. There are millions of possible problems and solutions: - Noise: cover in metal can? Multiple samples with averaging? - non-linearity: Table correction with interpolation? - hysterisys: Another layer of correction based on prior position? But it seems to me to be an interesting idea that has not been explored in the hobbyist circles. --- James. > -----Original Message----- > From: piclist-bounces@mit.edu > [mailto:piclist-bounces@mit.edu] On Behalf Of Russell McMahon > Sent: 2005 Feb 17, Thu 18:56 > To: Microcontroller discussion list - Public. > Subject: Re: [EE] Low cost encoder. Is it a compass? > > >> If you are after revolution counting then ... > > > No, I was thinking of an oscillator. > > I could see that you were THINKING of an oscillator. > The question (mine anyway) is, what are you trying to achieve? > Looking back at the thread I see it wasn't posed as an > application question but as a "is this yyy just an xxx" so we > seem to have wandered into something without every having had > a requirement specified in any way. (Unlike the more usual > threads where the trequirement is not specified well). > > What is the (technology and possible-solution free) aim of > the exercise? > > > RM > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist ------=_NextPart_000_02AC_01C515BD.58497AE0 Content-Type: image/png; name="bfo metal detector.PNG" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="bfo metal detector.PNG" iVBORw0KGgoAAAANSUhEUgAAAhgAAAEBCAIAAAC110uJAAAAAXNSR0IArs4c6QAAAARnQU1BAACx jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAUMxJREFU eF7tfc/rfkuR3mRrNCsneA04BMeJxsCMd2ICcg1MAhcuZIguhHDBgEQIEnTlQncmxGw0BCEYGAgS IQQ3Mou4ELJxmcVs598xz9fHKev2z+qfp8976uXl3vd7Pn2qq6uq6+mq/vW3fv3rX/+ef1wCLgGX gEvAJdAtAQCJf1wCLgGXgEvAJdAtgd/rftNfdAm4BFwCLgGXwJu0lkvBJeAScAm4BFwCIxJwIBmR nr/rEnAJuARcAh6RuA24BFwCLgGXwJgEPCIZk5+/7RJwCbgEHi8BB5LHm4ALwCXgEnAJjEngfkDy 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