Correction: Coulomb is not an unit of current
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Electric Armor
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Coulomb is an unit of charge. [Q]
Current is measured in Amperes in the international system. [A], so X amperes will pass through a conductor, not Coulombs.
I have seen those buttons often in elevators here in Europe, they don't need any pressure, just touching them makes a difference of potential, between the button and ground and activates a very simple circuit with an Operational Amplifier and a transistor. The only drawback is that they don't work with globes or with dielectric matherials. (Skin is obviously ok). So I think those are cheap and easy to get. In order to be useful: a buzzer should be attached to the switch ( a domestic buzzer will do ) or to a electrical switch if the buzzer exceeds the amperage of the presureless switch. I think it would be interesting to make it able to use a battery just in case the lights go off and she has to call for assistance. Assembling the parts shouldn't be difficult.
I hope it helps. Pedro Larroy
I've solved it using QoS with Linux. Setting up queues in order that p2p traffic don't interfere with critical applications such as web browsing.
This is my stats page: http://omega.resa.es/stats/inetout/
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Coulomb is an unit of charge. [Q]
Current is measured in Amperes in the international system. [A], so X amperes will pass through a conductor, not Coulombs.
Look at http://www.theportablepc.com/portable.htm. Hope it helps. Regards.
I have seen those buttons often in elevators here in Europe, they don't need any pressure, just touching them makes a difference of potential, between the button and ground and activates a very simple circuit with an Operational Amplifier and a transistor. The only drawback is that they don't work with globes or with dielectric matherials. (Skin is obviously ok). So I think those are cheap and easy to get. In order to be useful: a buzzer should be attached to the switch ( a domestic buzzer will do ) or to a electrical switch if the buzzer exceeds the amperage of the presureless switch. I think it would be interesting to make it able to use a battery just in case the lights go off and she has to call for assistance. Assembling the parts shouldn't be difficult. I hope it helps. Pedro Larroy
I've solved it using QoS with Linux. Setting up queues in order that p2p traffic don't interfere with critical applications such as web browsing.
This is my stats page:
http://omega.resa.es/stats/inetout/