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Unread 12-25-2013, 08:35 PM   #21
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Default Re: $3 speedometer miles/metric

OK... I've been away all day and could only respond from my phone. Let me try to explain it another way now that I am at my keyboard.

The digital speedometer basically calculates speed based on the number that is programmed in as the wheel circumference, and the rate at which the magnet is triggering. Don't confuse 'rate' with 'speed'.

'Rate' is defined as how often the magnet triggers the switch(frequency).

The 'speed' of the magnet determines how long the switch gets triggered by the magnet, and is not relevant to the speed calculation.

As to the magnet moving faster, the further from the hub center, that is correct. Think about it this way... if the wheel was 100 feet in diameter, and you installed two magnets in line with each other(like on a spoke). The first magnet is mounted 1 foot from the center of the hub, and the other magnet is mounted 50 feet from the center of the hub. Now spin the wheel and see which magnet reaches the 12 o'clock position first. They both get there at the same time no matter how fast you spin the wheel. The relative speed of the outer magnet will be greater than the inner, but that's because it has farther to travel in the same amount of time.

When I calculated the circumference of the wheel that had the magnet mounted to it, I measured the distance the cart moved(with my weight on it) after the wheel had rotated exactly 10 revolutions. I then divided that number by 10, and converted to metric. That is the number I programmed in for wheel circumference. I think this method gives better averaging.
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Unread 12-26-2013, 01:22 PM   #22
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Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
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Default Re: $3 speedometer miles/metric

Quote:
Originally Posted by 1989Marathon View Post
Go to walmart and get the Schwinn digital bike speedometer. You program the tire circumference.
This would be most accurate. The one I have on my road bike has you take the wheel off, mark the tire with a crayon or tape, then roll it on the garage floor one full revolution, measure the distance between the two marks and use that number to program into the unit. I've checked mine with a gps and it's dead on.
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Unread 12-26-2013, 11:02 PM   #23
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Default Re: $3 speedometer miles/metric

Quote:
Originally Posted by 1989Marathon View Post
OK... I've been away all day and could only respond from my phone. Let me try to explain it another way now that I am at my keyboard.

The digital speedometer basically calculates speed based on the number that is programmed in as the wheel circumference, and the rate at which the magnet is triggering. Don't confuse 'rate' with 'speed'.

'Rate' is defined as how often the magnet triggers the switch(frequency).

The 'speed' of the magnet determines how long the switch gets triggered by the magnet, and is not relevant to the speed calculation.

As to the magnet moving faster, the further from the hub center, that is correct. Think about it this way... if the wheel was 100 feet in diameter, and you installed two magnets in line with each other(like on a spoke). The first magnet is mounted 1 foot from the center of the hub, and the other magnet is mounted 50 feet from the center of the hub. Now spin the wheel and see which magnet reaches the 12 o'clock position first. They both get there at the same time no matter how fast you spin the wheel. The relative speed of the outer magnet will be greater than the inner, but that's because it has farther to travel in the same amount of time.

When I calculated the circumference of the wheel that had the magnet mounted to it, I measured the distance the cart moved(with my weight on it) after the wheel had rotated exactly 10 revolutions. I then divided that number by 10, and converted to metric. That is the number I programmed in for wheel circumference. I think this method gives better averaging.
That makes sense, wasn't thinking about it the right way, brain was on limited power.
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Unread 12-27-2013, 08:13 AM   #24
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Default Re: $3 speedometer miles/metric

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Originally Posted by 93yellowclubcar View Post
That makes sense, wasn't thinking about it the right way, brain was on limited power.
My brain is on limited power most of the time.
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Unread 08-10-2018, 08:03 AM   #25
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Default Re: $3 speedometer miles/metric

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