X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-TCPREMOTEIP: 207.224.51.38 X-Authenticated-UID: jpd AT noqsi DOT com From: John Doty Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-64--95877552 Subject: Re: [geda-user] Best way to measure RPMs Date: Thu, 23 Jan 2014 18:49:42 -0700 In-Reply-To: To: geda-user AT delorie DOT com References:

<52E02A51 DOT 5090008 AT estechnical DOT co DOT uk> <0b0750d2097334a10a9c03e2f9b09599 AT mail DOT gmail DOT com> <52E1645F DOT 7090204 AT buffalo DOT edu> Message-Id: <35292CC3-B1EA-4E43-8EDC-C89AEB91615C@noqsi.com> X-Mailer: Apple Mail (2.1085) Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk --Apple-Mail-64--95877552 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Jan 23, 2014, at 6:34 PM, Nathan Stewart wrote: > The Cherry part I listed doesn't require an inductive bridge, just a = pullup resistor. I think counting gear teeth is a good idea regardless = of the sensing mechanism as it gives you free resolution.=20 At these speeds, you get the best resolution by measuring the rotation = period and dividing one minute by it.=20 John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ jpd AT noqsi DOT com --Apple-Mail-64--95877552 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii

The Cherry part I listed doesn't require = an inductive bridge, just a pullup resistor. I think counting gear teeth = is a good idea regardless of the sensing mechanism as it gives you free = resolution.

At these speeds, you get the best resolution = by measuring the rotation period and dividing one minute by = it.

John Doty Noqsi = Aerospace, Ltd.

http://www.noqsi.com/

jpd AT noqsi DOT com

= --Apple-Mail-64--95877552--