nilclass

I can only find pictures of 6-lobed Gamebit screws

I think I found it, it's this kind: https://ctatools.com/products/5065x12

thanks, this might be just the comment I needed! Some of the screws are sunk into a very deep hole (~60mm), so it would be tough to cut a slot into those. But i'll give it a try on one of the more exposed screws, just to see if that gets me anywhere.

true, looking at second pic it's very hard to make out. I tried to capture it on the first picture, but it's not that good

yeah, it is inverted (or "external" torx according to your link). They also made sure to sink the screws into a whole where no pliars will fit...

Growing plants with LEDs certainly works, I'm just wondering if the power of a USB port is enough

Is this a painting, or actual fruit?

If fruit, how long did it last until the apples turned brown?

there's no need for relays if you have low voltage

That's a good point. Also makes me wonder if those lights will actually make a difference when it comes to plant growth, given the low power.

It's not completely stupid. One pissible issue: when the light level is around the threshold, slight variations (think: cloud passing by) will cause the relay to switch back and forth quickly. This can be solved with some additional parts (keyword: hysteresis).

I would recommend using a microcontroller, it makes this problem easy to solve, plus you can have more logic to trigger the lights (eg time based).

Another thing is turning off: if it's purely based on light level, you need to make sure the sensor does not "see" any of the LED light, otherwise it thinks the sun is back up

Sounds like gifting

Yeah, mini is the best! It is robust and has a ahape that makes it easy to figure out which way to plug it. I love it when i fet a device with a mini

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