[chbot] Car 12v supply to 5v VCC.
markaren1 at xtra.co.nz
Sun Jul 7 02:32:27 BST 2019
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
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
> 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.
> 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).
> Daniel Powell.
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