[chbot] Car 12v supply to 5v VCC.

Mark Atherton markaren1 at xtra.co.nz
Sun Jul 7 02:32:27 BST 2019

Hi Daniel,

First on your list would be my first choice, only because of the size of 
the regulator :) Also appears to be available on Trademe for a 
https://www.trademe.co.nz/Browse/Listing.aspx?id=2212079583Datasheet for 
the XL6009 part is https://www.sunrom.com/get/283300 indicates that the 
part is up to 94% efficient, and has a wide input range - 5-32V. Power 
spikes on car 12V rails can be quite large, so having a regulator that 
can tolerate a 32V spike is heading in the right direction.

As Volker says, mechanical vibration can be a killer; all components 
need to be well secured; screwing or gluing modules to an insulated 
substrate may work well.

Looks like a great project, links to photos of the project / vehicle 




On 7/07/2019 9:04 AM, Daniel Powell wrote:
> Sorry for the intrusion with something bound to be a simplistic and 
> rather rudimentary question given my lacklustre knowledge in electronics.
> I’m currently developing an ESP32 wrover, CAN Bus based dash for my 
> race and rally car. I’ve already prototyped the dash using a Nano 
> (which was too slow to capture every frame), then prototyped all but 
> the 7 segments using the ESP32 (7 segments are 5v LL, ESP is 3.3). 
> I’ve recently transferred it to protoboard (which I’m simply using as 
> a flat substrate to level and mount the modules). I need to reliably 
> convert the car 12v to the 5 volt required for VCC on most of my 
> devices. I’ve purchased a handful of different aliexpress 3A DC to DC 
> voltage stepdown regulators and a 1.8A buck converter.
> I wondered, given the noisy power environment of a race car, which, if 
> any, would be best to provide 5v to my dash.
> Unfortunately my pics break the 40k email list limit, as such I’ll 
> include links to the devices.
> https://www.aliexpress.com/item/32280431843.html , LM2596HVS, XL4005 
> and XL7015
> https://www.aliexpress.com/item/32961984080.html , 12V LM7812
> https://www.aliexpress.com/item/32921703886.html
> I’ve previously used a radio control UBEC to convert the car power to 
> something I could pump into a raspberry pi, through it’s on board 
> conditioning, however I’ve never bothered to understand the 
> fundamentals of power supply or how to smooth it such that I don’t 
> damage componentry.
> https://www.aliexpress.com/item/32920672534.html
> Help genuinely appreciated.
> For those of you interested and wishing to punish yourselves further.
> TTGO ESP32 wrover (on board CAN)
> NS65HVD230 CAN  transceiver.
> MAX2719 8x8 matrix (gear display)
> 4 x TM1637 - 7 segments (switched pages of 4 pressures/temps/alerts)
> 2 x 8 WS2812 Neopixles. (RPM and colour change for alerts).
> TXS018E 8 channel logic level converters (yet to test).
> Regards,
> Daniel Powell.
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