Boot animations on a car display - gimmick or worth keeping?

I built a similar thing for my garage door panel last year, complete with a fake loading bar and a spinning dial animation on boot. For the first month I loved it, then my wife started sighing audibly every time she walked in and had to wait about eight seconds before she could actually see the door status. That told me everything I needed to know about the line between fun and frustrating. An interface you use daily gets judged very differently from one you show off to friends.

What worked for me was keeping a short version by default and putting the full theatrics behind a momentary button on the GPIO header. Quick boot now takes maybe two seconds, and when I want the whole show, one press replays the sequence. Guests ask about it constantly, wich honestly is half the fun of these builds. I also made the animation skippable, so tapping the screen during boot jumps straight to the main view. Small thing, but it means nobody is ever trapped waiting.

For a truck I'd think the skip gesture is even more important, since you glance at that thing for a second or two, not stare at it. Keep the flourish, give yourself an escape hatch, and you get the smile without the daily tax.

I landed on a middle path with the little status screen I built for my camper. The full theatrics, starscroller and fake terminal text and all, only runs on a cold boot. Every time after that it skips straight to the live readouts in under a second. Turns out ESPHome makes this easy enough if you check whether the display has already been up, or just key the animation off a boot counter or a saved flag. The trick is that the thing still feels like a prop every morning of a trip, but never makes you wait when you just need to see the tank levels right now.

For your truck I'd do something similar: long cinematic sequence on the first start of the day, quick boot the rest of the time. You get the smile without the daily tax.

The passenger button idea is good too, and cheaper than you'd think. I added a physical button to mine that replays the whole sequence on demand, and honestly it gets more use than I expected. Kids love it, and it's become a party trick when people ride along. Since it's on demand, nobody resents it. One more thought from experience: keep the animation on a separate update interval from your sensor reads. Mine used to stutter whenever the radar sweep and the temperature polling landed on the same tick, and trimming that made everythign feel snappier even with the flourishes left in.

I found that the frame rate of the animation really dictates how fast the whole sequence plays, even if the code is simple. Instead of trying to make the transition instantaneous, I experimented with reducing the frame count of the loop untill it felt snappy enough. It didn't save me seconds, but it made the whole thing feel much less chunky when it does run. If you are using GIFs, making sure they aren're optimized for the screen resolution is a huge help.

I ussually find those elaborate boot sequences distracting if the underlying system isn't rock solid. When I tinkered with these kinds of projects back in the day using older microcontrollers, the fun animations were often overshadowed by power management issues. If the system was in deep sleep and the animation just dumped a bunch of activity on the power rail, it could cause wierd brownouts later. I suggest making sure the core status data is already stable before you start the show, even if it's just displaying a simple text readout. Does anyone else worry about system stability right after a long power cycle, or is ESPHome stable enough on its own?

The issue isn't just about speed, it's about context. On my last build, I used the button input to keep the dramatic sequence alive, not the power cycle. It made the boot sequence an on demand feature rather than a mandated wait. I set the timeout for the live view to 5 seconds if the physical button wasn't pressed, meaning the flourish had to be actively requested. That approach totally eliminated the morning sigh factor you're worried about.

I've run into a diferent snag with these fancy animations, and it's about power draw. When you're running a busy display loop like that, even with a low frame rate, the microcontroller's power consumption can creep up fast. I'm worried that if the truck sits for a couple of days, it'll chew through the battery before the vehicle is even started. Do you guys monitor the current draw while the sequence is running? A couple of milliamps more than expected might be doing a ton of damage over time. I'm thinking maybe there's a way to put the MCU into a deeper sleep state during the initial boot sequence, only waking up fully for the main graphical loop. That might save energy while keeping the boot-up effect intact.