Ozzy
Needs a job
need guberment cheese
Posts: 3172
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posted August 04, 2002 05:27 AM
Electronic Help needed
I know a lot of you guys have added an inline switch for the cooling fan.
I, being a lazy ass haven't gotten around to doing it yet. Now that my bike is out of commision for a few more weeks, I am going to finally do this task.
What I am thinking is - can one of you electronic guys tell me what to use to have the speed sensor signal activate a relay that would turn on the fan in the same circuit with the manual switch. I am so dam forgetful that I know I will leave the fan on when I am moving and it isnt really needed. I think it would be slick to have the speed sensor trigger the relay at a preset speed, say 20 mph and tha fan turn off when old forgetfull (me) starts moving forward and forgets the turn off switch. Thanks, Ozzy.
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"It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and we're wearing sunglasses......HIT IT!"
Blues Bros.
  
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted August 04, 2002 06:58 AM
Wow, that's a little harder than it sounds. First thing is to put an oscope on the speed sensor output, and measure the pulse train. Run the bike at the desired speed and see how fast the pulses are coming in at. Then build a counter circuit that will give you outputs at the chosen speed. Have the output trigger a relay, which would activate the fan. With that in mind, you are halfway to building a digital speed for the 12. If enough people are interested, I think I can build the counter circuit. What I'd like to do is to figure out the lcd array on the stock instrument cluster and have the clock function as the speedo.
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BA
Pro
Posts: 1592
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posted August 04, 2002 02:12 PM
uh, yeah, I was going to say that too, but Swft beat me to it!
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Ozzy
Needs a job
need guberment cheese
Posts: 3172
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posted August 04, 2002 02:14 PM
Hey SWFT, it is way harder than it sounds for a dumb asss like myself,LOL. The relay part I understand, but the counter circuit is far far beyond my knowledge base. How about you putting one of your 12's on the dyno with a scope and getting the magic number for 20 mph?
There was a guy on the boards sometime back that designed a digital gear indicator. He posted it on the web, but I dont remember the address. His screen name was RidgeRacer, and he was from the Pudget Sound area, anyone remember him? His email was mbially@tenforward.com . I have sent him email asking for his design on this project, maybe he will reply. If anyone knows how to get ahold of him, please let me know. Thanks, Ozzy.
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"It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and we're wearing sunglasses......HIT IT!"
Blues Bros.
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zxlnt
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted August 04, 2002 07:36 PM
I think I have the stuff on the gear indicator save on my other computer. I will look for it when I get back there.
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted August 04, 2002 07:44 PM
The gear indicator circuit is pretty simple. It's reading discrete outputs for each gear. The speedo circuit has to take a signal and sum it prolly about 10 times ever second. The stock speedo does that, then uses a dc stepper motor to position the speedo dial. What needs to be built would be a summing circuit that gives discrete lcd outputs, that you can send directly to a lcd display, or wire into the lcd display for the clock on the stock instrument cluster.
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ZXtra
Expert Class
Posts: 490
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posted August 04, 2002 08:11 PM
Digital gear indicator...
http://www.bikeland.org/board//viewthread.php?FID=1&TID=317
 -ZXtra
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The sixth sick sheik's sixth sheep's sick!
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted August 05, 2002 11:20 AM
You know, it's really silly. For $50, you can buy a speedo/odo/hoodywhatsit for your mountain bike, but you can't get a digital speedo with three digits to save your ass!
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