Timeline for How to detect angular position of a device mounted on a rotating wheel?
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 16, 2011 at 21:42 | vote | accept | avra | ||
| Oct 16, 2011 at 16:03 | history | tweeted | twitter.com/#!/StackElectronix/status/125602899530223616 | ||
| Oct 13, 2011 at 15:25 | comment | added | Russell McMahon♦ | See additions at end of my answer. It would be nice not to have to play "guess 1000 questions" and have the real spec explained instead of sneaking up on it slowly, as we are doing now. If this is for a "hub odometer" arrangement aimed at measuring wheel RPM then an easy andeffective way is an internal "bob weight" which hangs down internally and does not rotate when the wheel does. This is sensed going past a point on the PCB etc. This needs a mechanical bearing which is very easy to make and to design and can be very long life. The hub-odometer industry churns these out by the millions. | |
| Oct 13, 2011 at 14:38 | comment | added | avra | If I had to make this on just one car, I would probably use Hall Effect sensor and a magnet on car fixed frame to detect revolutions. However, I need to make this easily attached to many types of cars so I am looking for a universal way without mounting anything on the fixed frame. All I can use must be on the wheel, and to avoid balancing problems I want to use only center hole in the wheel to put my electronics into. Sensor can peep out of it without affecting balance. | |
| Oct 12, 2011 at 23:02 | answer | added | Toybuilder | timeline score: 2 | |
| Oct 12, 2011 at 22:44 | comment | added | snoopen | @avra Is there a specific reason you can't mount the device on the rim and use a counter weight to keep the wheel balanced? If so could you instead run a sensor from the hub to the rim? It might help to reconsider the mechanics of your situation before focusing so much on the electronics. | |
| Oct 12, 2011 at 8:20 | comment | added | Russell McMahon♦ | Magnet need not be on frame. if this is a conventional wheel it has a stub axle and bearings and a backing plate etc. The clearance between still and rotating parts is very small - mm. But eg magnet could be 10mm - 20mm away on a backing plate etc. | |
| Oct 12, 2011 at 6:09 | comment | added | avra | The wheel is on the car. I can not mount magnet or something reflective on the car frame to use hall effect sensor, IR and similar. Thank you for your input. | |
| Oct 10, 2011 at 16:00 | comment | added | Russell McMahon♦ | What is the wheel on? Is this a vehicle? Battle bot, tank, car, motorbike, ... ? If it is a motorcyle and you can "loft the front wheel and you want to know when ground comes near again, we need to know. If this is s rally car, moon lander, ... we need t know. | |
| Oct 10, 2011 at 15:53 | comment | added | Russell McMahon♦ | Do you really mean "detects when wheel passes ground"? or instead "when a given point on the wheel is at it's lowest point IF the bike is on a flat hozizontal surface. This is important as detecting wheel position and detecting ground are two different sorts of problem. Tell us what you REALLY want to do and we'll tell you how to do it :-). | |
| Oct 10, 2011 at 15:52 | answer | added | Russell McMahon♦ | timeline score: 7 | |
| Oct 10, 2011 at 15:49 | answer | added | stevenvh | timeline score: 3 | |
| Oct 10, 2011 at 15:39 | history | asked | avra | CC BY-SA 3.0 |