Re: [Gumstix-users] building a bike rpm sensor and connecting it to gumstix

[Andy T. <tri...@gm...>]

Albert,
That looks like a great tutorial! The reason for wanting to use the  
gumstix is the ability to upload this data to the internet.  We're  
planning to hook this up to a stationary bike and upload the bike  
speed and heart rate of the user to a central machine for the purpose  
of a study.

Can you connect pics like that to the gumstix?

I'm also wondering how to interface the gumstix with the heart rate  
monitor we're looking at using.  Vernier.com makes one[1], and it  
sends a voltage signal of about 3v when there's a heart rate and 0v  
when there isn't.

[1] http://www.vernier.com/probes/probes.html?hgh- 
bta&template=standard.html

On Aug 5, 2005, at 9:56 PM, Albert den Haan wrote:

> Andy:
>
> A gumstix may be overkill for simply counting wheel and/or crank  
> turns, but I like it as a concrete acheivable project!
>
> The piclist folks have a whole turtorial on building a cycle  
> computer with a *much* smaller device here:
>
> http://www.piclist.com/techref/piclist/biketut/index.htm
>
> Chapters 8 and 10 seem to cover more of the nuts and volts aspects  
> relevant whatever processor is used:
>   http://www.piclist.com/techref/piclist/biketut/chapter8.html
>   http://www.piclist.com/techref/piclist/biketut/chapter10.html
>
> The piclist.com site is an amazing resource for embedded  
> developers.  If I have a low level technical question googling that  
> site first usually satisfies my needs
>
> e.g. http://www.google.com/search?q=site:piclist.com%20ps/2%20protocol
>
> http://www.google.com/search?q=site%3Apiclist.com+i2c
>
>
> Andy Triboletti wrote:
>
>
>> Hi, I'd like to build a sensor that readHi, I'd like to build a senso
>> Hi, I'd like to build a sensor that reads the rpm's of my bike and  
>> connect that to the gumstix. I was thinking of using something  
>> like a hall effect sensor, or maybe something optical that would  
>> sense everytime an led came around on the spoke.  I've read about  
>> the robostix, the GPIO on the gumstix, but I'm not really sure  
>> what the best way to do this would be.  I've seen lots of sensors  
>> that you can buy that  give you this on a display, but I'd like to  
>> interface it with the gumstix (it's for a senior design project  
>> where we are recording the heart rate  along with rpm of someone  
>> bicyling and storing it a database on the gumstix).
>>
>> Has anyone had any experience building a sensor like this? Or some  
>> general guidelines on how to access data from the input lines.  I  
>> read somewhere on this list you would be able to access it from  
>> linux just like 'cat proc/ADDR01', is this available now or is it  
>> harder?
>>
>>
>>
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>
>
>
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