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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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02-27-2016, 11:22 AM | #21 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Golf cart Speedometer
Quote:
The XCT (which has user programmable RPM limiting) came out before I got the tach installed and when I installed a XCT, I eliminated the primary need for the tach. I use the GPS from my car when I want to measure distance traveled or top speed and I could simply get a GPS for the cart, but it just clips into a bracket and sits in plain sight, so it is easy to steal and I don't always remember to disconnect it and take it with us when we go into a restaurant or store. Like a bicycle speedometer, the tach can be bolted on and is less likely to walk away when left unattended. Since the XCT also uses the motor speed sensor output, I'll probably have to build a buffer to isolate its input from the tach input and I'm getting lazy in my old age, so I'm looking at GPS based bicycle speedometers. |
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02-27-2016, 02:24 PM | #22 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,126
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Re: Golf cart Speedometer
I used an optical coupler - no buffer to connect to the speed sensor. Works fine. Keeps the circuits isolated.
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02-27-2016, 03:16 PM | #23 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Golf cart Speedometer
Quote:
Optical is the way to go for pulse trains. I've also kicking around the idea of tossing in a divide-by-n counter to reduce the PPS from the sensor, which would effectively increase the height of my tires and reduce the intrinsic error due to only being able to input whole numbers for the tire dimension used for calibration of bicycle speedometers. However, I'm lazy, so I'll probably just get a bare bones GPS for the cart and super-glue it in place. |
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02-27-2016, 03:55 PM | #24 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,126
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Re: Golf cart Speedometer
If you want to use a bike speedometer, a divide counter is a good way to get in range of the standard wheel size programming. Normal bike speedometers only get one pulse per rev and normal bikes have large wheels. The other problem with most standard bike speedometers is that they use radio sensors that sense the magnet directly so it's hard to hook anything like a speed sensor up to them. I'm sure you can figure something out though.
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