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  #1  
Old 19th June 2014, 01:43 PM
Davidbolam Davidbolam is offline
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Default Shift Light

Does anyone know how to make a simple circuit to make an adjustable shift light. preferable a sequential one with a row of LED's. a single big red one will do thought!

I want to make one to link into the MX5 rev counter wire.

It needs to be really easy as im a liability with a soldering iron!!

David
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  #2  
Old 19th June 2014, 03:46 PM
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Stot Stot is offline
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Quote:
Originally Posted by Davidbolam View Post
Does anyone know how to make a simple circuit to make an adjustable shift light. preferable a sequential one with a row of LED's. a single big red one will do thought!

I want to make one to link into the MX5 rev counter wire.

It needs to be really easy as im a liability with a soldering iron!!

David
Not sure Id be attempting it if your soldering skills are that bad but a couple of scematics here.

Cheers
Stot
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Old 19th June 2014, 09:31 PM
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skov skov is offline
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I designed a sequential one a few years ago, mostly sold them to VW Corado owners as it integrated into the dash nicely (sorry awful quality video!):

https://www.youtube.com/watch?v=s7MNOMVfMng

Stopped making them ages ago and don't think I have any left though. There was never much money in it

To be honest a single big light is probably more useful than sequential.
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Old 19th June 2014, 10:45 PM
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CTWV50 CTWV50 is offline
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Quote:
Originally Posted by skov View Post
I designed a sequential one a few years ago, mostly sold them to VW Corado owners as it integrated into the dash nicely (sorry awful quality video!):

https://www.youtube.com/watch?v=s7MNOMVfMng

Stopped making them ages ago and don't think I have any left though. There was never much money in it

To be honest a single big light is probably more useful than sequential.
Bloody hell! That was you. I remember Mr. Beige selling them. How is the Beige one?
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Old 19th June 2014, 11:12 PM
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skov skov is offline
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Bloody hell! That was you. I remember Mr. Beige selling them. How is the Beige one?
Ha ha, yeah that was me! I designed and built them and Mr Beige sold and fitted them.
I forgot you knew the Beige one. I think he's alright, haven't seen him in ages though, sort of lost touch when he left Cambridge. I think he's working for McLaren now.
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  #6  
Old 19th June 2014, 11:22 PM
Davidbolam Davidbolam is offline
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All the diagrams I have found look very involved. I was hoping to use a variable resistor, a transistor and an led..

David
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Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.

Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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  #7  
Old 20th June 2014, 08:01 PM
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alga alga is offline
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I made one out of an Arduino. Overkill, I know, but it cost under 10 in parts, anyway, and it's infinitely tuneable ;-).

https://www.youtube.com/watch?v=E3j_aek5Y-0

The outputs are just LEDs connected to the output pins with 560 Ohm resistors.
The input is a stabilizer with a 1K resistor and a 4.7V zener. I can sketch the schematic if anyone's interested.

For the "production" version I used a $10 Arduino Pro Mini. Here are some pics of the final product without the 3d printed box it's in now:
http://imgur.com/a/IHBOv

Also, I added a 7805 stabilizer for power feed, as Arduino Pro Mini is rated only up to 12V, and in the car it can get more than that.

The code is available here: https://github.com/alga/shiftlight

The circuit used to work perfectly with Ford's ECU, but after the MS3 install it catches some interference and blinks sometimes. I can't get around to hanging a low-pass filter capacitor on the input.
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  #8  
Old 21st June 2014, 09:53 PM
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Alga - this is what I was looking for Simple sequential shift light.
So - can you sketch schematic ? My electronic skills are even worse than mechanic skills
Hope your code (after modification) can handle 12000rpm...

Is it complicated to modify code to set rpm for first LED by button, then other LED will light up with 500rpm increments from "set" value ? I never played with such electronics...
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  #9  
Old 22nd June 2014, 01:06 AM
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Ben_Copeland Ben_Copeland is offline
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Maplins do a super cheap shift light. Goes green then red.

http://www.maplin.co.uk/p/26mm-redgr...-cluster-pd00a

I run mine off my megasquirt.
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  #10  
Old 24th June 2014, 01:07 AM
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alga alga is offline
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Lukasz, here's the schematic:



You can use Arduino Uno or whatever to test, but then to embed something smaller like Nano or Pro Mini is more convenient.

If you look at the source, https://github.com/alga/shiftlight/b...shiftlight.ino , you'll see that the pin numbers of the input and outputs, as well as RPMs for each led and for the blinking warning are spelled out in the constant definitions.

In order to set the switchover RPMs on a button press you'll need to add a button that grounds one of the free input pins, set the mode for that pin to INPUT_PULLUP, and in the loop check if the pin is LOW, and if it is, fill in the thresholds array with the new values based on current RPM. You'll need to delete the const specifier from the variable definition in order to be able to modify the array. Piece of cake.
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