Which arduino fits my project the best?

Hardware
1

Hello, I want to use an arduino to control multiple things in my project car. The things I need are:

  • Can-Bus support

  • switching of 2 relays

  • one PWM output

  • 3x temperature sensors

  • detecting charging voltage from the generator instead of just ignition (14.4V vs 12V) if this is even possible?

I was looking at the Arduino Uno Rev.4 SMD, WiFi. Can wifi be used for reprogramming? It would be nice if I ever have to change something once it's installed in the car. Is this the best arduino I can use or are there other one's better suited for my application?

2

See Is OTA upload to the UNO R4 WiFi board supported? - #3 by ptillisch

an ESP32 would offer OTA capabilities and has an integrated CAN controller and therefore doesn’t need an external controller. See CAN bus — ESPHome for an example

PWM is supported natively too and driving sensors or relays is just a matter of choosing components correctly and connecting /powering your stuff correctly. Mind electromagnetic interferences.

3

Is this a real car or a model? Most any of the Arduinos will work There are CAN bus modules for about a buck and a few resistors will do the voltage measurement for you.

4

ok, yes it's a real car

5

is the ESP32 an arduino? I thought using an arduino would be a big benefit as the community is so large.

6

No it's not, but the IDE will typically support it.

7

The alternator typically handles this internally so probably not.

Also, the H7 lite could be another potential solution.

8

I highly recommend you read this application note by ST: AN2689 "Protection of automotive electronics from electrical hazards, guidelines for design and component selection"

9

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