Mechanical to Electric Speedometer
Posted by jbtmorgan@reddit | projectcar | View on Reddit | 8 comments
Made a kit that removes the mechanical speedo (Didn't work anyway, since different transmission setup) from a 79' F100 with a Cummins swapped in it.
VSS tells Arduino pulses -> Pulses converted into speed -> Speed converted into a servo angle. Maintains OEM look and can be easily reprogrammed to adjust for different gearing/tire sizes.
_clever_reference_@reddit
Got any guide on how you did this? Id like to keep the stock speedo in my Datsun but am running a CD009 trans now. I have an Arduino kit but haven't messed with it yet.
jbtmorgan@reddit (OP)
I did make a video for this initial prototype. Happy to clarify any questions. Keep in mind my explanation for sensors was pretty coarse. Just enough to get the general concept down.
https://youtu.be/VPncaicDwu0?si=emy6xzrUipxJB2GW
TurboDorito@reddit
What servo did you go with? I've been interested in doing something similar.
jbtmorgan@reddit (OP)
A 9G SG90. You don’t need much. Only thing I recommend is getting that can rotate beyond 180deg. Once this truck hits about 60mph the servo can’t go anymore.
I’ll do a revision one day with a new servo, and dedicated circuit board. Right now it’s just an arduino and a buck converter
TurboDorito@reddit
Yeah I need a 360 sweep because I want to use linear speedo that turns a barrel over rather than sweep a needle.
My concern was about accuracy more than anything.
jbtmorgan@reddit (OP)
I was finding the accuracy is more to do with the wiring/data acquisition more than the servo on my end. It’s a $2 servo at best and matched quite well for my setup. Let me know what you opt for and how it might work out!
_clever_reference_@reddit
Got any guide on how you did this? Id like to keep the stock speedo in my Datsun but am running a CD009 trans now. I have an Arduino kit but haven't messed with it yet.
FalseRelease4@reddit
hell yeah, thats really cool