From zhongminwang at cc.usu.edu Tue Jan 11 15:08:09 2005 From: zhongminwang at cc.usu.edu (zhongmin wang) Date: Tue Jan 11 15:47:33 2005 Subject: [WheelWatcher] can not get 128 cpr Message-ID: <003501c4f832$6afe23f0$b7557b81@wzm> Hello, Can anyone share experimence with me how to make perfect alignment? I can not get 128 pulses per rotation by counting clk pulses. You help is need badly regards zhongmin wang Jan, 10 ,2005 From plskeggs at noeticdesign.com Tue Jan 11 16:00:02 2005 From: plskeggs at noeticdesign.com (Pete Skeggs) Date: Tue Jan 11 16:00:09 2005 Subject: [WheelWatcher] can not get 128 cpr In-Reply-To: <003501c4f832$6afe23f0$b7557b81@wzm> References: <003501c4f832$6afe23f0$b7557b81@wzm> Message-ID: <41E46882.8020601@noeticdesign.com> zhongmin wang wrote: >Hello, >Can anyone share experimence with me how to >make perfect alignment? >I can not get 128 pulses per rotation by counting clk pulses. > > Hi, Zhongmin, Sorry to hear you are having trouble. Here are a number of things to check. 1. Are you using your WheelWatcher encoders on standard servos with standard wheels (as pictured on www.nubotics.com)? 2. Are the wheels being held in by their screws, into the servo motor shafts? 3. Are the WheelWatcher circuit boards laying flat against the surface of the servos (neither too high nor bent due to using spacers that are too short), as shown in the manual? 4. Have you checked alignment using the alignment tools? Try turning the wheels slowly back and forth with the power on to the WheelWatcher boards but the servos not being driven by the controller. 5. Do the LEDs blink? The green LEDs should indicate direction of rotation, and should be solid on in one direction but solid off in the other; if the green flashes while turning the wheels steadily, then there is a sensor problem (see below). The red LEDs should blink on and off 32 times per wheel rotation. 6. Do they do this, or are there portions of the wheel rotation during which the red LED is solid off or solid on? If the green or red LEDs are not behaving as I indicated, then one of the following may be the problem: A. the codewheel sticker is dirty B. the wheel is wobbling such that the distance from the detectors (ISO1 and ISO2) are varying too much during a 360 degree rotation C. the board is mounted too close or too far from the wheel, so that the distance from the detectors to the codewheel is not good 7. What kind of servos are you using? 8. Please measure the supply voltage going to the WheelWatchers. Is it 5v? 9. What kind of controller are you using to count the pulses? Perhaps the pulses are too short (25us low going pulses are too short for controllers such as the Parallax Basic Stamp). Please let me know your answers to questions 1 through 9. Sincerely, Pete Skeggs Nubotics WheelWatcher Tech Support From plskeggs at noeticdesign.com Tue Jan 18 10:31:41 2005 From: plskeggs at noeticdesign.com (Pete Skeggs) Date: Tue Jan 18 10:31:43 2005 Subject: [WheelWatcher] can not get 128 cpr In-Reply-To: <41E46882.8020601@noeticdesign.com> References: <003501c4f832$6afe23f0$b7557b81@wzm> <41E46882.8020601@noeticdesign.com> Message-ID: <41ED560D.4000907@noeticdesign.com> Zhongmin, Were you able to fix your problem? Sincerely, Pete Skeggs WheelWatcher Tech Support Pete Skeggs wrote: > zhongmin wang wrote: > >> Hello, Can anyone share experimence with me how to make perfect >> alignment? I can not get 128 pulses per rotation by counting clk pulses. >> >> > > Hi, Zhongmin, > > Sorry to hear you are having trouble. Here are a number of things to > check. > > 1. Are you using your WheelWatcher encoders on standard servos with > standard wheels (as pictured on www.nubotics.com)? > > 2. Are the wheels being held in by their screws, into the servo motor > shafts? > > 3. Are the WheelWatcher circuit boards laying flat against the surface > of the servos (neither too high nor bent due to using spacers that are > too short), as shown in the manual? > > 4. Have you checked alignment using the alignment tools? > > Try turning the wheels slowly back and forth with the power on to the > WheelWatcher boards but the servos not being driven by the controller. > 5. Do the LEDs blink? The green LEDs should indicate direction of > rotation, and should be solid on in one direction but solid off in the > other; if the green flashes while turning the wheels steadily, then > there is a sensor problem (see below). The red LEDs should blink on > and off 32 times per wheel rotation. > 6. Do they do this, or are there portions of the wheel rotation during > which the red LED is solid off or solid on? > > If the green or red LEDs are not behaving as I indicated, then one of > the following may be the problem: > A. the codewheel sticker is dirty > B. the wheel is wobbling such that the distance from the detectors > (ISO1 and ISO2) are varying too much during a 360 degree rotation > C. the board is mounted too close or too far from the wheel, so that > the distance from the detectors to the codewheel is not good > > 7. What kind of servos are you using? > > 8. Please measure the supply voltage going to the WheelWatchers. Is > it 5v? > > 9. What kind of controller are you using to count the pulses? Perhaps > the pulses are too short (25us low going pulses are too short for > controllers such as the Parallax Basic Stamp). > > Please let me know your answers to questions 1 through 9. > > Sincerely, > Pete Skeggs > Nubotics WheelWatcher Tech Support > > > _______________________________________________ > WheelWatcher mailing list > WheelWatcher@list.nubotics.com > http://list.nubotics.com/mailman/listinfo/wheelwatcher > > From jabshier at kc.rr.com Tue Jan 25 09:26:42 2005 From: jabshier at kc.rr.com (John C. Abshier) Date: Tue Jan 25 09:51:00 2005 Subject: [WheelWatcher] Need longer wires. Message-ID: <000601c50303$09a7e330$0201a8c0@Texas> I need longer wires to reach my microcontroller. I need a source to buy the pins and the socket for my own wires or a source for longer wires with the pins and the socket. From plskeggs at noeticdesign.com Tue Jan 25 10:20:58 2005 From: plskeggs at noeticdesign.com (Pete Skeggs) Date: Tue Jan 25 10:21:03 2005 Subject: [WheelWatcher] Need longer wires. In-Reply-To: <000601c50303$09a7e330$0201a8c0@Texas> References: <000601c50303$09a7e330$0201a8c0@Texas> Message-ID: <41F68E0A.3020707@noeticdesign.com> John, The wires are available, precut and crimped with the correct pins, from Digikey, as are the socket connector housings. They sell the wires as a value-added service, meaning that they make them to order. You can specify single or double ended, the color, the gauge, and the length. Socket: Hirose P/N DF11-8DS-2C, Digikey P/N H2022-ND, catalog page: http://dkc3.digikey.com/PDF/T051/0070.pdf Wires (6", socket single end, 26 AWG): Digikey P/N H3BXT-10106-x6-ND, where x is B, A, R, L, V, or Y for the various colors, catalog page: http://dkc3.digikey.com/PDF/T051/0078.pdf For longer wires, the part number will be different. For example, for a 12" black wire, it would be H3BXT-10112-B6-ND. If you want the same 2mm socket on both ends, it would be H3BBT-10112-B6-ND. You can also buy the pins and crimp them yourself, but the crimping tool is special and costs > $500. Just so I know for future reference, if you don't mind my asking, how long do you need, what chassis are you using, and what microcontroller? Thanks, and let us know if we can be of any further help. Sincerely, Pete Skeggs WheelWatcher Tech Support John C. Abshier wrote: >I need longer wires to reach my microcontroller. I need a source to buy the pins and the socket for my own wires or a source for longer wires with the pins and the socket. > > >------------------------------------------------------------------------ > >_______________________________________________ >WheelWatcher mailing list >WheelWatcher@list.nubotics.com >http://list.nubotics.com/mailman/listinfo/wheelwatcher > >