I get really upset when people walk past me about 3 feet away, when there is ample space to leave the 2 meter gap.
So I decided to make a respect my covid space hat:-
Although this looks as though it has worked, you can’t see the circle in daylight. The line is actually very narrow, but because I can’t stand still and this is a very long exposure you can see multiple lines.
This is the hat and “holder”
The holder
I used a laser diode and a rotating mirror at an angle: it’s supposed to be 22.5°, but I think it’s probably closer to 25° (maybe I was subconsciously compensating for the fact that I’m a short arse).
I could have used three AAs but I decided to use an 18650 with a BMS (battery management system)
I just use the plug as the on/off switch; the power supply to recharge the cell uses a similar plug.
I tried a 5mW laser initially, but, it could hardly be seen in a darkish room with the hat on the floor. At least the 100 mW one can be seen reasonably indoors. (There is an astonishing difference between normally lit indoors and daylight.)
Now, although I thought the rotating mirror was a really neat solution, I think that it might be better to use, say 40 of the 5mW units (about $10 worth) arranged around the rim of the hat; that would give about one dot per foot.
Does any one have any other ideas?
Feel free to say that the whole idea is stupid.
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