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Hi.I am currently working on a project, and need to be able to detect the presence/absence of an object which is inside a person's hand, from a small distance (a minimum of about 2cm from the hand, although about 10cm would be ideal). The object to be detected must be small enough to be held hidden in a hand, and the detector needs to be small enough to be worn comfortably on the wrist (probably on a lead to power and processing held elsewhere). In fact, the smaller the better.Does anybody know of any way I could accomplish this? I am currently looking into hall effect sensors, but don't know if the output from these could be amplified to give the required range?Many thanks.
[...] an object which is inside a person's closed hand,
Does anybody know of any way I could accomplish this? I am currently looking into hall effect sensors, but don't know if the output from these could be amplified to give the required range?
Sorry about that, I should have made it clearer. In my spare time I also dabble in magic tricks, and this is being built as part of a trick I am working on. Basically, the "object" will be a ball of clay or poker chip or something, with whatever I am detecting hidden inside. The detected item can be a magnet, RFID tag or whatever else is required as long as it will fit.
P.S: I am aware that this may not be considered a robotics project as it doesn't move, but at least it will be connected to a microcontroller and have some level of "intelligence" in that it will make decisions and control an output, so it is kind of a robotics project .