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This is the 2011 version of the remote, which is mounted to the user's wheelchair. On the outside are 4 touch switches that are easy to operate by someone with limited hand motion and which have have drain troughs in between to increase usability in rain. The user hits the "+" and/or "-" buttons to select the floor, and the remote automatically calls that floor a few seconds later. There are separate buttons for "open door" and "call emergency phone".
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Here is the remote with the top removed, so you can see the wiring from the touch switch panels to the detector circuits on the top board
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Schematic of the remote control's 2 circuit boards 
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Layouts of the remote control's circuit boards, top layer 
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Layouts of the remote control's circuit boards, bottom layer 
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Top Side of Top Board 
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Bottom Side of Top Board 
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Top Side of Bottom Board 
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Bottom Side of Bottom Board 
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