Homegrown digital dash

[_Iain_]

So process so far goes

Make board -> make software -> make new board -> Make casing -> bin everything and start again with 90% new software & hardware

If im to understand correctly?

Interesting stuff anyhow - have been most impressed with the 3D printer thread especially as i'd never seen anything like it before!
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Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[J.M.]

[nowhere.elysium]

Yeah, that's pretty much how it works. C'est la vie.
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[Clanger]

n.e. check this out... you're gonna like it... https://techtripper.com/worlds-first-3d-printed-racing-car-can-pace-at-140-kmh/ and wish you were involved... it's sooo cool.
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Be who you are and say what you feel, because those who mind don't matter, and those who matter won't mind - Dr. Seuss

[Aff]

[tahrey]

This is ALL of the "Yes!".

Any news in the last month?

[anthony_r6]

Bumpity Bump Bump.

What's going on with this?
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Ted : "Maybe he's agoraphobic."
Dougal : "Jack scared of fighting? I don't think so, Ted."

[nowhere.elysium]

Well, it's been left by the wayside for a while, but now that I've got a couple of weeks off, I'm hoping to be able to make a serious dent int he last bits of the project.

Sorry for leaving it so long, guys.
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[U_W v2.0]

look forward to seeing progress, was worried it had been scrapped lol.
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BCF's biggest cunt list: Cansa, Pits, Rob

[nowhere.elysium]

Right. In light of blade023 trying to beat me to the punch, this project's getting dusted off and resurrected. There is a space, it must be watched.
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[blade023]

hahaaar, it's ON!

Just a pita I can't quite figure out the right voltage for the tacho output signal from the dash...
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Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[nowhere.elysium]

[blade023]

Here's the thing... I've made a nice little voltage divider, which takes 14v dc and drops it to about 4v dc. I've worked out that (I think) the tacho signal that goes to the dash is ac. I've got a salvaged wiggly to straight electric making doodad which takes said wiggly, and spits out straight electricity. I hooked it all up, with a little test led and... nothing.

The led gets (after rectalification and voltage division) about 1-2v which isn't enough to light it. This is where it gets annoying...

The multimeter shows some voltage on ac test mode, on the led + and -. This either means the rectificatoriser is bent, OR there's a nice dc pulse there. But the pulse is of very low voltage.

the actual leads straight from the dash show the following...

dmm in ac mode, 14v~
dmm in dc mode, 6vdc

Now.. if it's an ac pulse (say about 50hz or so) that's just ac, but low voltage (compared to house ac.)

If it's a dc pulse, my brain has just turned to mush.

Surely the tacho output, going by the evidence is a 14v~ pulse, and after rectification I've got a <14vdc pulse right? Assuming you lose some voltage through straightening.. I'm going to try reworking my voltage divider and see what happens to the LED. Brave test pilot. Arduino salutes you!
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Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[nowhere.elysium]

Sounds like it might be a PWM output, then. I'll plug my oscilloscope into my SV at some point soon, and have a look.
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[blade023]

Damn, you're pretty far away from me, otherwise I'd pester you to borrow your oscilloscope some time. I don't have one, so figuring this all out is challenging to say the least. Could you look at the plug that goes into your dash and see if it's similar to mine please? If they work the same (no idea how many variants of dash rpm display there are for mechanical dashboards) I may be able to get some info from you with your shiny oscilloscope. I'm having a hard time finding anything about what kind of signal is sent into the dash to represent rpm.

Another thing I'm considering doing now, is completely isolating the dash circuit from the arduino circuit. In other words, having the tacho signal activate a switch which switches a 5v circuit in the arduino. Less to figure out that way. I'm loathe to do anything with the spark plug lead, as it looks more complicated than I'd like.
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Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[blade023]

Might want to check my (schtolen) thread; I've had another thought which should be much less risk to the arduino should it work. I'll do some calculations in a moment but there's no reason it shouldn't.
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Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[mentalboy]

[blade023]

mentalboy: If you would that would be fantastic. It would certainly make it easier to design a circuit if I know for certain what signal I'm working with and how it changes.
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Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[blade023]

Small update for N.E...
I've made a breakthrough. Using the circuit explained in my thread, I've got meaningful rpm display on the leds! i'll do up a circuit diagram for u in a mo
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Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[blade023]

This is what I did:
https://www.kenhawley.co.uk/tachinput.png
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Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[blade023]

Just thought I'd add, in case you weren't aware of this..

The circuit that's connected to pin D2 on the arduino is not your average switch type circuit. You'll notice the lack of a resistor there. There's an interesting article somewhere I found which says you *can* wire a pin to ground via a switch *if* you enable the internal pullup resistor. Otherwise you'd normally have it wired differently:

Standard button wiring
https://arduino.cc/en/tutorial/button

With the circuit I've used, you need to put the following in your code:

[blade023]

Bumpity boomp.

Any progress with your dash Nowhere?
____________________
Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[nowhere.elysium]

Not yet, I've had to move departments at work, so there's been rather a lot on my plate. I imagine I might get some time once next week has passed.
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[blade023]

Don't mean to pester you here, but...

Are we there yet?
Are we there yet?
Are we there yet?

Just kidding. Are you planning on open sourcing everything still? If you are, and you have a chance at some point, I'd quite like to see an overview type checklist thingy with your progress and planned features/jobs to do. I've made some progress, and I'll be making another video to upload soon(tm) showing how far I've got. Also found some very useful things regarding tacho and speedo signals. I've already got a working tacho circuit that's pretty simple to implement and interface with the arduino, that eliminates the issues of voltage conversion and whatnot.

In fact, thinking about it, I may just update my website and stick an arduino section in there, with links to code and source inspiration and such. Like a bikeduino page.

*wanders off to fire up dreamweaver*....
____________________
Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.

[blade023]

Check this out!
____________________
Current: VFR800 2008 13.7k and rising rapidly!
Sorn: 2003 FZS1000 30k(ish) looking to sell.