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U.S. carriers board almost 700 million passengers onto U.S. aircraft every year.
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A pin header on the end connects to the cable that runs from this carrier board to the main carrier board.
We created another carrier board to house an LCD, four pushbuttons, and a potentiometer.
Since time and budget are our two main constraints and we already had a microcontroller carrier board from the lab, we decided to use the carrier board and a protoboard to connect the other hardware.
The LCD is powered by an external 2xAA battery pack which provides the 3.3V needed by the sparkfun carrier board.
The carrier board for the MCU has pin headers for all the port pins, a pin header for ISP, and a simple 5V voltage regulator.
We created a carrier board to hold the MCU, GPS module, SD card, motor control circuits, and lots of pin headers.
There are also pin headers to attach the cable to the LCD carrier board, the two motors, and the VCC line from the MCU to the power switch.
It was orginally 6 inches long, but we trimmed it to be as small as possible, meaning the length of the MCU carrier board.
The carrier board attaches to the user's wrist with two thin Velcro strips that run through slots we cut in the perfboard.
To fix this, we added a small SPDT switch that connects VCC on the carrier board to the positive battery lead for on or leaves VCC floating for off.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com