Getting the right reed switches and magnets
January 17, 2010
I have a setup in mind, which involves a magnet put next to a reed switch, times 2. So it should work so that a reed switch is only activated when two magnets are stuck together and next to a reed switch, and deactivate once there's only one magnet next to it.
So I have found a couple of products from this at Sparkfun:
But the thing is that I don't know how to figure out what kind of magnets to get, or whether they're too strong or too weak for the reed switch. All I've found out is that the magnetic field is measured in Teslas, but there is no info on the reed switch, and how much pull it needs to activate.
Furthermore I'm going to need a touchscreen, and I've been thinking about buying this:
But the problem is that I will need to attach my magnet right behind the touchscreen, so I need to get a magnet that's weak enough, that it doesn't ruin or distort the touch screen, if at all possible.
So can anyone give me some pointers to this?