Noob alert! I'm tinkering on my garage project, standard vehicle stuff - 12V lead acid battery, 3-phase stator, reg/rec. I would like to put few additions to its circuit. Being a rookie, I'm not sure how to approach this correctly in terms of providing safe 5V for these microcontrollers. I've read a lot of articles on transients and noises in vehicle environment - load dumps, over and undervoltages, spikes...and also proper grounding, ground loops, it just seems overwhelming hence this thread
I've sketched up (sorry for any drawing mistakes) the circuit I plan to make, and there's two of them, the difference being grounding of the 5V devices, since I don't know which method is actually correct, grounding 5V devices to chassis or to the buck converter providing the 5V. For the conversion I have a Traco Power TMDC 20 unit, if you have the time you can look up its specs, from my limited knowledge that converter should be good for my use case but do let me know if its not.
Also another issue I'm worried about is grounding the buttons on Arduino for the logic level signals - I presume they all should be grounded on their own Arduino GND pin - but then there's a issue of physical distance, the buttons themselves will be at least 2 meters from the Arduino, so this makes me think about interferences, noises on the wire, etc. Here's the schematic and thanks for any help
I've sketched up (sorry for any drawing mistakes) the circuit I plan to make, and there's two of them, the difference being grounding of the 5V devices, since I don't know which method is actually correct, grounding 5V devices to chassis or to the buck converter providing the 5V. For the conversion I have a Traco Power TMDC 20 unit, if you have the time you can look up its specs, from my limited knowledge that converter should be good for my use case but do let me know if its not.
Also another issue I'm worried about is grounding the buttons on Arduino for the logic level signals - I presume they all should be grounded on their own Arduino GND pin - but then there's a issue of physical distance, the buttons themselves will be at least 2 meters from the Arduino, so this makes me think about interferences, noises on the wire, etc. Here's the schematic and thanks for any help