Because it adds something that is not essential, so it is not "simple". If package A depends on package B with an incompatible license then it needs to provide a means to specify alternate packages. Arch follows upstream with best effort possible, so changing dependency could be seen as breaking that. However, pacman already supports choosing alternate packages during installation so technically they could add it, but how many percentage of users are needing that convenience? Not to mention the arch team will need to maintain said list of alternatives for every dependencies. If you want, you can add it yourself via pacman hook to prevent you from accidentally installing non free software, or write a wrapper for pacman, or use other distro like Parabola.
Phone processors do post processing when taking a picture, even with the "no filter" selection. So yeah, it is understandable sometimes people can mistake a picture as "AI" since the artifact from said processing can become apparent
Where does it normally plug into? If it plugs into some sort of computing device, then yeah, one of them MAY be signal (probably LIN). If it could function with a simple switch however, then as the other said, try every combination possible.
Read about multiplexing. There are various ways to achieve it, the easiest way is to just arrange it on a grid. Let's say 5×5. So with 10 pins, you can address 25 doors. For the lock, the easiest would be a solenoid / magnetic lock. You can also use a motor, but that would require a more complex addressing to reverse the rotation for opening and closing
Edit for more clarity about the simple method:
Think of every door as a solenoid connected to GND. You only need VCC to open it. You can use relay module to switch the row and column to connect the VCC of the solenoid. But you need to wire every solenoid in "AND" switch configuration so it only turns on if and only if both row and column switch are closed
If your lithium battery has BMS, it should be fine since a lot of BMS will have a lot of protection including over current. If your raw dog the cell, then as the other said, any voltage and current into the battery should be capped. Ideally, you should monitor each cell as well to prevent an over voltage of any of the cells in the pack. If you want to be safe without monitoring every cell, then just make sure nothing gets back into the battery. Nothing goes in = can't get overcharged by accident from back emf.
There is a lot to unpack here. But my suggestion is "cheap" esp32 devboard. At least where I live, going with older / raw MCU (not a "devboard") will ended up more expensive. I'll give an example. The STM32F103C8T6 "Blue Pill" cost the same as ESP32 DOIT Devkit (around USD 3). BUT the bare MCU of both cost around 1-5 cent more due to the economy of scale. So unless you plan to design a custom board in bulk/size constraint, buying the devkit and making a daughter board can ended up cheaper
Yeah, that's a broken heater. A broken heater sign is usually high resistance or good ol disconnect. It being in parallel further reinforces that. This is a common schematic for domestic refrigerators.
I've seen the pic. So the plate is not the component? I thought the whole plate was the component. In that case, if it is a small metal plate like any of this, then it most likely is a thermal cutoff.
It's not running the compressor in reverse necessarily. It just used to sense when the temperature of some point has reached some threshold. Remember, a high temperature on the cold side could also be used to trigger the compressor to cool down the fridge.
Because it adds something that is not essential, so it is not "simple". If package A depends on package B with an incompatible license then it needs to provide a means to specify alternate packages. Arch follows upstream with best effort possible, so changing dependency could be seen as breaking that. However, pacman already supports choosing alternate packages during installation so technically they could add it, but how many percentage of users are needing that convenience? Not to mention the arch team will need to maintain said list of alternatives for every dependencies. If you want, you can add it yourself via pacman hook to prevent you from accidentally installing non free software, or write a wrapper for pacman, or use other distro like Parabola.