Download Final Documentation - University of Central Florida

5.2 Arduino ProtoShield PCB surface
The Arduino ProtoShield allows for circuit prototyping on a compact and
stackable surface. The ProtoShield mounts on top of the Arduino Uno board by
utilizing stackable headers. The convenience of this allows all the Arduino UNO
board pins to be raised to the Protoshield level for circuit design. The Arduino
ProtoShield kit which is roughly $10 depending on the online vender comes with
the following
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1 -- ProtoShield bare PCB
2 – Stackable Headers 8-pin
2 – Stackable Headers 6-pin
2 – 5mm LEDs
2 – 330 Ohm resistors
1 – 10k Ohm resistor
2 – push buttons
2 -- .1 uF ceramic capacitors
The capacitors of the kit will be placed across the 5V supply and ground acting
like decoupling capacitors to prevent unwanted voltage change to the board.
All the components are soldered through hole and tutorials for setup of this
protoshield kit are provided on SparkFun.com. The interesting components to
comment about in this kit are the 5mm LED’s. These LED’s could serve a
number of purposes for our project. One of the LED’s could be used as a power
indicator connected directly to the 5V supply pin on the board. The buttons could
be useful as well when the need arises to toggle manual control between drivers,
instead of control solely through the software.
The ProtoShield as far as our Solenoid driving circuitry should have enough
space for our two H-bridge drivers and LED’s signifying current direction. The
prototype board even comes with a 6-pin header for our Bluetooth module, the
important pins being the Rx and Tx for wireless serial communication.
Final Circuit Design
The final circuit did not consist of any development boards. Although we did use
the Arduino Uno for testing and prototyping our circuit, for the final circuit we had
an atmega328P for our MCU and utilized the pin connections it has to interface
with our h-bridges and hall-effect sensors. LED’s were not utilized to indicate
direction; this was purely done through the android app that was created. Figure
5.2 shows the final schematic that we used for the Mag Lev project. Diodes were
not needed on the h-bridge outputs for current fly back protection because the
supply voltage is not greater than 24 V.
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