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If it is a colour camera it won't be much good at seeing IR. Even monochrome cameras will have IR filters unless you buy one specifically without one, or remove it.
I am not sure if LED legs are universal - it is best to check the data sheet - but I had a quick look at one and the anode was the short leg, so that should be connected to the 555. If it is the wrong way round I wouldn't expect it to short anything out, depending on the LED - some have quite low maximum reverse voltages.
Keith.
I am not sure if LED legs are universal - it is best to check the data sheet - but I had a quick look at one and the anode was the short leg, so that should be connected to the 555. If it is the wrong way round I wouldn't expect it to short anything out, depending on the LED - some have quite low maximum reverse voltages.
Keith.