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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Jay Kay on June 18, 2015, 02:33:53 PM

Title: Fuel light K75S
Post by: Jay Kay on June 18, 2015, 02:33:53 PM
I have this 1988 K75S and now i'm turning it to a cafe racer. I removed the instrumental cluster because it's so bulky. I'm using sigma speedo but fuel level warning light would be nice. I'm thinking about a simple led ligt. Would it work?
Title: Re: Fuel light K75S
Post by: rbm on June 18, 2015, 07:13:50 PM
I've designed and had circuit cards made for a single LED fuel level indicator for the K-bike.  It will display Green with a full tank, flash green with 50% full, Red at 25% full and flash red with 15% full.  It works with the later fuel level senders only.  The circuit plugs into the 4-pin connector on the K-bike harness, under the tank.
Title: Re: Fuel light K75S
Post by: MonkeyMcBean on June 18, 2015, 07:46:42 PM
Today I change the oil (first time since I've owned it) and changed the final drive oil (certainly for the first time).

Oops, wrong thread. Is it possible to delete a comment?
Title: Fuel light K75S
Post by: Elipten on June 18, 2015, 08:33:37 PM
RBM, by later what years are you talking?
Title: Re: Fuel light K75S
Post by: rbm on June 18, 2015, 08:42:57 PM
'85 and on K100.  All years of K75.  It's the sender that is a variable resistor-type driven by a float arm.
Title: Re: Fuel light K75S
Post by: Jay Kay on June 22, 2015, 12:51:35 PM
I've designed and had circuit cards made for a single LED fuel level indicator for the K-bike.  It will display Green with a full tank, flash green with 50% full, Red at 25% full and flash red with 15% full.  It works with the later fuel level senders only.  The circuit plugs into the 4-pin connector on the K-bike harness, under the tank.

Do you mean that connector?
Title: Re: Fuel light K75S
Post by: MonkeyMcBean on June 22, 2015, 12:53:55 PM
Rbm,

Do you have plans for this circuit? I'd love to build something Like that.
Title: Re: Fuel light K75S
Post by: Jay Kay on June 22, 2015, 12:59:41 PM
Me too  :yes
Title: Re: Fuel light K75S
Post by: rbm on June 22, 2015, 04:44:50 PM
Do you mean that connector?
Yes, that connector
Title: Re: Fuel light K75S
Post by: rbm on June 22, 2015, 04:53:32 PM
Rbm,

Do you have plans for this circuit? I'd love to build something Like that.
Yes, I have plans and boards.  I can sell the raw boards or completed units; picture of the unpopulated card below:
(https://lh3.googleusercontent.com/-xrW_ZbFB8ww/VYl4QIiD6zI/AAAAAAAAGDc/pvxYp-rxbJc/s400/CCI23062015.png)

I've designed the unit under the Open Source Hardware copyright so the design is in the public domain.  It uses a Digispark to read the sender and drive the LED so you'll need to have a computer to program the Arduino with the code I've written.

Link to Project files (schematic, board layout, Arduino code, Gerber files) (https://drive.google.com/file/d/0B3UPbNZRyr1rMDdYbW1ZSlVVWDA/view?usp=sharing)

Title: Re: Fuel light K75S
Post by: MonkeyMcBean on June 28, 2015, 12:43:58 PM
Thank you very much! This will be awesome!
Title: Re: Fuel light K75S
Post by: K1300S on January 08, 2016, 08:37:21 PM
hi robert,
still have completed units available?  what does it include? price?

Thanks! 
Title: Re: Fuel light K75S
Post by: rbm on January 09, 2016, 08:05:03 PM
I've boards and parts, no completed units.  Actually, I should complete at least one unit to test that it functions just like the prototype, but I haven't followed up on that intention.  The fuel indicator hasn't been popular.  If you're interested, I'll dedicate the time to getting one working for you.  I haven't determined a price just yet because I have to determine my costs; it's going to be around the $20- $25 mark I suspect.
Title: Re: Fuel light K75S
Post by: K1300S on January 09, 2016, 08:19:19 PM
would love to try one Robert.  sign me up!  getting tired of staring in the fuel filler hole or guessing from the miles.  a simple LED setup in the dash is cleaner than cutting a hole in the fairing for an analogue gauge.

thanks!
Title: Re: Fuel light K75S
Post by: Elipten on January 09, 2016, 08:59:57 PM
I'm interested.