JAYCAR Speedo Corrector old model

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
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Holden202T
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Re: JAYCAR Speedo Corrector old model

Post by Holden202T »

i havent tested much but this is what the specs are for it.
specs.jpg
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immortality
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Re: JAYCAR Speedo Corrector old model

Post by immortality »

:thumbup: :punk:

I figure there will be demand for these.
Red_Six
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Re: JAYCAR Speedo Corrector old model

Post by Red_Six »

Hi Holden202T,

great work in building your own kit.

How did the pricing of the BOM work out?

Have you had a play with Arduino, Teensy, STM32 or Pi Pico development boards? They are probably overkill for a speedo healer but having the bootloader and USB connector would make it handy for updating the firmware to add new features.
Could you add a bootloader to the PIC to update firmware via RS-232 or an FTDI cable?

I'm probably overthinking all of that anyway. Keep up the good work.
In-Tech
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Re: JAYCAR Speedo Corrector old model

Post by In-Tech »

Nice work :thumbup:
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Holden202T
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Re: JAYCAR Speedo Corrector old model

Post by Holden202T »

its not the cheapest, all the parts plus pcb works out about $45 which includes the box.

i normally get my parts from Digikey (USA) and they offer free shipping for orders over $60 .... so if you were to want to order one you'd want to get a few other parts to top the order up to $60.

as far as adding new features, i have no interest in that nor the time! :wtf:

could save a few dollars by not using the screw down terminals, and just solder wires onto the PCB ... just depends what your looking for i guess.

those rotary encoders are expensive too in the scheme of things.

i guess if your doing a conversion and want your speedo accurate for $50 its not bad.
ejukated
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Re: JAYCAR Speedo Corrector old model

Post by ejukated »

Silicon chip also did a MK3 speedo corrector which doesnt appear to have the rotary encoders. Its in the Sept 2013 edition but i dont have a full copy of the article.
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Holden202T
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Re: JAYCAR Speedo Corrector old model

Post by Holden202T »

Well based off your info of the date i found the mazagine article :)

https://archive.org/details/silicon_chi ... ember+2013

from a first quick glance ... there are still two adjustments, but they use a variable resistor instead of the rotary encoders, theres also a different model PIC on it ... multi colour LED .... its definitely a bit neater with the resistor arrays too.
corrector-mk3.jpg
corrector-mk3.jpg (72.75 KiB) Viewed 3064 times
at a guess its a similar size to the one i made to fit into a nice small box.

looks like its also got a jumper for 24v supply.
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Re: JAYCAR Speedo Corrector old model

Post by antus »

I think that is the mk3 kit, which we know doesnt work properly for our application. Here are the schematics for the 2 kits side by side. If we could work out whats wrong we might be able to come up with a fix for the Mk3 based jaycar kit.

Looking at it, it looks like Zener diode ZD2 and the 150ohm resistor on RB0 in the mk2 might make a difference to the types of input signal accepted by the pic. I wonder if those two components were added to the Jaycar if they'd come to life.
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mk2 vs mk3.jpg
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ejukated
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Re: JAYCAR Speedo Corrector old model

Post by ejukated »

Interesting, i have a mk1 and it works well on the T5 hall effect sensor. I recall there was an issue, can someone remind me what the problem with the MK3 is?
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Holden202T
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Re: JAYCAR Speedo Corrector old model

Post by Holden202T »

if anyone has a mk3 they are willing to send us for testing let me know :)
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