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Make the button panel


Discussion
The button panel allows the user to interact with the robot.  By pressing one of the 4 buttons (tack switches) on the panel the user can select items on the menus displayed on the OLED display.  The panel uses a single analog I/O pin on the Arduino board to communicate the button selection.  It does this by connecting the 4 buttons in parallel with resistors between each button.  



Each button pressed will result in a different resistance on the data pin.  However, if multiple buttons are pressed at the same time it will result in anomalous readings (so only press a single button at a time).  An alternate design could have been used where each button was connected to a digital I/O pin which would have allowed multiple button recognition, unfortunately there were only 3 digital pin left on the Arduino board.

Parts 

development board x1
8mm socket screw x 2 

 1K ohm resistor x 4 

9mm tack switch x 4

15K ohm resistor x 1

keyed 3 pin housing x 1

Tools

safety glasses

hacksaw

soldering iron

allen wrench

solder smoke scrubber

work gloves



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