And the esp32 board got super hot(at least 60 degree, or more) and same thing for the ir sensor. It's weird since at worst I connected it to the vin instead of the 3.3v, But I'm pretty sure that the positive wire was to the 3.3v and not the vin, and negative was to negative. Maybe even I put the current in the sda, scl pins, which could have caused this? anyway I think I wired it correctly anyway, but I'm still saying at worse since I freaked out when I touched it and unplugged it quickly.
Anyway, is it maybe a weird i2c command from a previous sketch that made the sensor drain an heroic amount of power(I don't think so lol, I'm really a noob) or maybe its some resistor that acted crazy, anyway something bad happened and I'm not sure whether it will affect the precision of my 100$ sensor or not, and also I don't know how its possible that they both got so hot, I did not even have the time to upload anything, it stayed like that 5 minutes. Will it happen again if the circuit is at fault? anyway thanks to anyone with real engineering skills that can give me a clear insight on what happened and whether it should affect its precision or not
Some IR sensors are made "backwards"... if you look under the coating, the traces do not go straight from card-edge pin to the sensor, but swap positions (I think DroneBotWorkshop mentioned this). Be sure to test continuity from pin to sensor.
That's not a very detailed explanation of why it would break it even for .5 seconds, and of what would break inside the sensor and how. Also even after that 5 minutes it can still get readings, I tried again and it still works, But I ask myself if it affected its accuracy. And the physical phenomenon behind why. It just got some current passing through, how does electricity break things in this context
Your not telling us the value of Vin has limited replies to a range of suspicions and maybes, frankly. So I'll give you some more supposition, based on 30+ years in the electronics industry.
What was the value of Vin, and are you saying you connected the VCC pin of the sensor to Vin? If so, and Vin is greater than something like 5 volts (upper end of the supply range for the sensor from what I see), then your sensor is very likely toast, and at the very least will be extremely suspect and likely inaccurate. Why? There is a significant semiconductor device in an IR camera, it's not just "a diode". That semiconductor has a supply voltage range. When you exceed that voltage range, you may subject the semiconductor to internal heating and stresses it's not designed for. You might not have damaged it irreversibly, but the fact that you felt extreme temperature dissipation from a device that normally draws 18mA tells me something was cooking nicely. That heat does change physical properties of things, as well as warping and damaging elements of the device.
So, maybe call up the supplier, fess up, and ask them if they'd expect the item to still work as expected, within warranted performance criteria, if you ran it from your Vin for 5 minutes. I'll bet the answer is no way. You might assume they're just greedy, but it's up to you.
That's also a good theory, as input pins like those are usually protected by diodes that go from pin to VCC, so for example, if VCC=0 but SDA=VIN, that diode was forward biased and severely toasted; the whole semiconductor effectively becomes the path to ground for that current.
I'd suggest you write this up to experience, and order another one.