I started cycling again (used to as a kid...) some 4 years ago. And while I know there are plenty of super cheap "bicycle computers" I have been thinking of making my own. Thus so far 4 years no speed/mileage indicator for me, obviously. While this may likely remain the case forever I am still thinking about it - not the obvious things like the MCU, display etc., just the rotation sensor. They all use a magnet placed somewhere on one of the wheels and some sensor, I have used a Hall sensor for pretty precise positioning of the rotor of our TLD reader etc., but I only still keep on thinking of making the thing because I imagine it sensing just the spokes, i.e. making some inductive sensor. I know what I will try out etc., I may even get to designing one before the millennium is over but well, these thoughts seem to be on topic and I am sure there are people with more experience making inductive sensors than I have. ====================================================== Dimiter Popoff, TGI http://www.tgi-sci.com ====================================================== http://www.flickr.com/photos/didi_tgi/
Spoke sensor for bicycle
Started by ●June 14, 2022
Reply by ●June 14, 20222022-06-14
On Tue, 14 Jun 2022 18:51:21 +0300, Dimiter_Popoff <dp@tgi-sci.com> wrote:>I started cycling again (used to as a kid...) some 4 years ago. >And while I know there are plenty of super cheap "bicycle computers" >I have been thinking of making my own. >Thus so far 4 years no speed/mileage indicator for me, obviously. >While this may likely remain the case forever I am still thinking >about it - not the obvious things like the MCU, display etc., just >the rotation sensor. They all use a magnet placed somewhere on one >of the wheels and some sensor, I have used a Hall sensor for >pretty precise positioning of the rotor of our TLD reader etc., >but I only still keep on thinking of making the thing because I >imagine it sensing just the spokes, i.e. making some inductive sensor. > >I know what I will try out etc., I may even get to designing one before >the millennium is over but well, these thoughts seem to be on topic and >I am sure there are people with more experience making inductive >sensors than I have. >.<https://en.wikipedia.org/wiki/Variable_reluctance_sensor> Joe Gwinn
Reply by ●June 14, 20222022-06-14
On 14/06/2022 16:51, Dimiter_Popoff wrote:> I started cycling again (used to as a kid...) some 4 years ago. > And while I know there are plenty of super cheap "bicycle computers" > I have been thinking of making my own. > Thus so far 4 years no speed/mileage indicator for me, obviously. > While this may likely remain the case forever I am still thinking > about it - not the obvious things like the MCU, display etc., just > the rotation sensor. They all use a magnet placed somewhere on one > of the wheels and some sensor, I have used a Hall sensor for > pretty precise positioning of the rotor of our TLD reader etc., > but I only still keep on thinking of making the thing because I > imagine it sensing just the spokes, i.e. making some inductive sensor. > > I know what I will try out etc., I may even get to designing one before > the millennium is over but well, these thoughts seem to be on topic and > I am sure there are people with more experience making inductive > sensors than I have.The ones I've had just used an encapsulated reed switch on the fork with a magnet on a spoke. It woke up the processor as well as providing a rotation signal. This was a few years back though. -- Cheers Clive
Reply by ●June 14, 20222022-06-14
On 6/14/2022 18:57, Joe Gwinn wrote:> On Tue, 14 Jun 2022 18:51:21 +0300, Dimiter_Popoff <dp@tgi-sci.com> > wrote: > >> I started cycling again (used to as a kid...) some 4 years ago. >> And while I know there are plenty of super cheap "bicycle computers" >> I have been thinking of making my own. >> Thus so far 4 years no speed/mileage indicator for me, obviously. >> While this may likely remain the case forever I am still thinking >> about it - not the obvious things like the MCU, display etc., just >> the rotation sensor. They all use a magnet placed somewhere on one >> of the wheels and some sensor, I have used a Hall sensor for >> pretty precise positioning of the rotor of our TLD reader etc., >> but I only still keep on thinking of making the thing because I >> imagine it sensing just the spokes, i.e. making some inductive sensor. >> >> I know what I will try out etc., I may even get to designing one before >> the millennium is over but well, these thoughts seem to be on topic and >> I am sure there are people with more experience making inductive >> sensors than I have. >> > > .<https://en.wikipedia.org/wiki/Variable_reluctance_sensor> > > > Joe GwinnHmmm, but will that work at really low speed (like when pushing the bike uphill)? It is an idea to do it this way (I did not even know the name of the method so the idea is more than welcome), yet what I was thinking was more in the line of changing some oscillation frequency (thus detecting the spokes also "at DC").
Reply by ●June 14, 20222022-06-14
Dimiter_Popoff <dp@tgi-sci.com> wrote:> I started cycling again (used to as a kid...) some 4 years ago. And > while I know there are plenty of super cheap "bicycle computers" I have > been thinking of making my own. Thus so far 4 years no speed/mileage > indicator for me, obviously. While this may likely remain the case > forever I am still thinking about it - not the obvious things like the > MCU, display etc., just the rotation sensor. They all use a magnet > placed somewhere on one of the wheels and some sensor, I have used a > Hall sensor for pretty precise positioning of the rotor of our TLD > reader etc., but I only still keep on thinking of making the thing > because I imagine it sensing just the spokes, i.e. making some inductive > sensor. > > I know what I will try out etc., I may even get to designing one before > the millennium is over but well, these thoughts seem to be on topic and > I am sure there are people with more experience making inductive sensors > than I have.This might be blasphemy, but... Speed and mileage indication is easily done with a smartphone these days, at least here in America.
Reply by ●June 14, 20222022-06-14
On Tuesday, June 14, 2022 at 1:16:34 PM UTC-4, John Doe wrote:> Dimiter_Popoff <d...@tgi-sci.com> wrote: > > > I started cycling again (used to as a kid...) some 4 years ago. And > > while I know there are plenty of super cheap "bicycle computers" I have > > been thinking of making my own. Thus so far 4 years no speed/mileage > > indicator for me, obviously. While this may likely remain the case > > forever I am still thinking about it - not the obvious things like the > > MCU, display etc., just the rotation sensor. They all use a magnet > > placed somewhere on one of the wheels and some sensor, I have used a > > Hall sensor for pretty precise positioning of the rotor of our TLD > > reader etc., but I only still keep on thinking of making the thing > > because I imagine it sensing just the spokes, i.e. making some inductive > > sensor. > > > > I know what I will try out etc., I may even get to designing one before > > the millennium is over but well, these thoughts seem to be on topic and > > I am sure there are people with more experience making inductive sensors > > than I have. > This might be blasphemy, but... > > Speed and mileage indication is easily done with a smartphone these days, > at least here in America.People often talk about cell phones as if they had universal coverage. That is true for 99.9% of where people spend their time. But that 0.1% of the time, like biking in the woods, you are out of cell phone range. So any solution needs to not depend on a cell phone connection. If you can use the GPS in your phone without a cell connection, great! But I haven't found such a program as yet. Maybe I just haven't dug deep enough. -- Rick C. - Get 1,000 miles of free Supercharging - Tesla referral code - https://ts.la/richard11209
Reply by ●June 14, 20222022-06-14
On 6/14/2022 20:25, Ricky wrote:> On Tuesday, June 14, 2022 at 1:16:34 PM UTC-4, John Doe wrote: >> Dimiter_Popoff <d...@tgi-sci.com> wrote: >> >>> I started cycling again (used to as a kid...) some 4 years ago. And >>> while I know there are plenty of super cheap "bicycle computers" I have >>> been thinking of making my own. Thus so far 4 years no speed/mileage >>> indicator for me, obviously. While this may likely remain the case >>> forever I am still thinking about it - not the obvious things like the >>> MCU, display etc., just the rotation sensor. They all use a magnet >>> placed somewhere on one of the wheels and some sensor, I have used a >>> Hall sensor for pretty precise positioning of the rotor of our TLD >>> reader etc., but I only still keep on thinking of making the thing >>> because I imagine it sensing just the spokes, i.e. making some inductive >>> sensor. >>> >>> I know what I will try out etc., I may even get to designing one before >>> the millennium is over but well, these thoughts seem to be on topic and >>> I am sure there are people with more experience making inductive sensors >>> than I have. >> This might be blasphemy, but... >> >> Speed and mileage indication is easily done with a smartphone these days, >> at least here in America. > > People often talk about cell phones as if they had universal coverage. That is true for 99.9% of where people spend their time. But that 0.1% of the time, like biking in the woods, you are out of cell phone range. So any solution needs to not depend on a cell phone connection. If you can use the GPS in your phone without a cell connection, great! But I haven't found such a program as yet. Maybe I just haven't dug deep enough. >Oh where I bike there is coverage allright, and I think I had seen references to some apps for biking. Looks like the only thing making me think of that "project" I am unlikely to ever even start is the sensor design.... (I am vague because I am not so sure myself why I keep thinking of this every now and then for 4 years and still have nothing in use when I bike :).
Reply by ●June 14, 20222022-06-14
On a sunny day (Tue, 14 Jun 2022 18:51:21 +0300) it happened Dimiter_Popoff <dp@tgi-sci.com> wrote in <t8aapr$ab6$1@dont-email.me>:>I started cycling again (used to as a kid...) some 4 years ago. >And while I know there are plenty of super cheap "bicycle computers" >I have been thinking of making my own. >Thus so far 4 years no speed/mileage indicator for me, obviously. >While this may likely remain the case forever I am still thinking >about it - not the obvious things like the MCU, display etc., just >the rotation sensor. They all use a magnet placed somewhere on one >of the wheels and some sensor, I have used a Hall sensor for >pretty precise positioning of the rotor of our TLD reader etc., >but I only still keep on thinking of making the thing because I >imagine it sensing just the spokes, i.e. making some inductive sensor. > >I know what I will try out etc., I may even get to designing one before >the millennium is over but well, these thoughts seem to be on topic and >I am sure there are people with more experience making inductive >sensors than I have.Or you could make something like my gm_pic2: http://panteltje.com/panteltje/pic/gm_pic2/ It uses GPS and writes to SDcard or EEPROM where you were at any time, logs radiation there too There is software to replay the trip on google maps. After all the GPS talk here .. Simple maaz using the space and time between data points will allow you to find speed and distances. A GPS module and a Microchip 18F14k22 + EEPROM is all you need. Oh and a battery... Now been working 24/7 for 8 years... As clock mostly. No tinkering with your bike needed. Also logs trips per bus or train.
Reply by ●June 14, 20222022-06-14
Ricky <gnuarm.deletethisbit@gmail.com> wrote:> John Doe wrote: >> Dimiter_Popoff wrote:>>> I started cycling again (used to as a kid...) some 4 years ago. And >>> while I know there are plenty of super cheap "bicycle computers" I >>> have > >>> been thinking of making my own. Thus so far 4 years no speed/mileage >>> indicator for me, obviously. While this may likely remain the case >>> forever I am still thinking about it - not the obvious things like >>> the MCU, display etc., just the rotation sensor. They all use a magnet >>> placed somewhere on one of the wheels and some sensor, I have used a >>> Hall sensor for pretty precise positioning of the rotor of our TLD >>> reader etc., but I only still keep on thinking of making the thing >>> because I imagine it sensing just the spokes, i.e. making some >>> inductive sensor. >>> >>> I know what I will try out etc., I may even get to designing one >>> before the millennium is over but well, these thoughts seem to be on >>> topic and I am sure there are people with more experience making >>> inductive sensors than I have.>> This might be blasphemy, but... >> >> Speed and mileage indication is easily done with a smartphone these >> days, at least here in America. > > People often talk about cell phones as if they had universal coverage. > That is true for 99.9% of where people spend their time. But that 0.1% > of the time, like biking in the woods, you are out of cell phone range. > So any solution needs to not depend on a cell phone connection. If you > can use the GPS in your phone without a cell connection, great! But I > haven't found such a program as yet. Maybe I just haven't dug deep > enough.On Android? Can anybody name one such Android app (with a decent rating) that DOESN'T work off-line (at least after you have paid the 1 or $2 for it)? There are plenty of hiking apps, obviously all of them work off-line. Another benefit is the logging, keeping a record of your travels. Plus it can use a phone's altimeter. Disclaimer: I haven't used any for real, just played with them. In the iPhone 3 days, I was pleasantly STUNNED by the fact weather radar was already available on a smartphone. I thought that was futuristic, but we were already there and there it was! Now the best for that is probably NOAH's website version. It's not perfectly functional, it could pause on the last frame and it could allow adjusting the frame rate, but it's easy to set up. It requires Internet. Use that sort of app on my PC ALL the time.
Reply by ●June 14, 20222022-06-14
On 6/14/2022 20:43, Jan Panteltje wrote:> On a sunny day (Tue, 14 Jun 2022 18:51:21 +0300) it happened Dimiter_Popoff > <dp@tgi-sci.com> wrote in <t8aapr$ab6$1@dont-email.me>: > >> I started cycling again (used to as a kid...) some 4 years ago. >> And while I know there are plenty of super cheap "bicycle computers" >> I have been thinking of making my own. >> Thus so far 4 years no speed/mileage indicator for me, obviously. >> While this may likely remain the case forever I am still thinking >> about it - not the obvious things like the MCU, display etc., just >> the rotation sensor. They all use a magnet placed somewhere on one >> of the wheels and some sensor, I have used a Hall sensor for >> pretty precise positioning of the rotor of our TLD reader etc., >> but I only still keep on thinking of making the thing because I >> imagine it sensing just the spokes, i.e. making some inductive sensor. >> >> I know what I will try out etc., I may even get to designing one before >> the millennium is over but well, these thoughts seem to be on topic and >> I am sure there are people with more experience making inductive >> sensors than I have. > > Or you could make something like my gm_pic2: > http://panteltje.com/panteltje/pic/gm_pic2/ > > It uses GPS and writes to SDcard or EEPROM where you were at any time, logs radiation there too > There is software to replay the trip on google maps. > After all the GPS talk here .. > Simple maaz using the space and time between data points will allow you to find speed and distances. > A GPS module and a Microchip 18F14k22 + EEPROM is all you need. > Oh and a battery... > Now been working 24/7 for 8 years... As clock mostly. > No tinkering with your bike needed. > Also logs trips per bus or train. > >Is the GPS accuracy/latency of the speed measurement close to that of a car's speed indicator?