Annie LyLawrence CagatinEE485 Spring 2012

Tuffy Medical Devices

* 8 compartments

* Carousel platform

* Angled

* Catch cup

* Automated

* Help take medication on time

Design

Design

Design

Design

Design

Design

Design

Driver

SN754410 (Quadruple Half-H Driver)Half-H is a variation of the solid-state H-Bridge circuit that uses only two transistors on one side of the loadDesigned to provide bidirectional drive currents up to 1A at voltages from 4.5V to 36VDesigned to drive inductive loads (device with coils of wire using magnetic fields to operate), in our case, a bipolar stepper motor

Driver

Arduino Uno• 14 digital I/O pins and 6 analog

inputs• The operating voltage is 5V• Recommended input voltage

ranges from 7V to 12V

LED Light Bar

• Include 3 high-output LEDs powered by 12V DC.

• Each LED absorbs approximately 30mA• Dimensions: 3.08” x 0.59” (78 x 15 mm)-Problems It CausedExternal 12V power source was needed to power these

16x2 Character Display

• Low power operation support (2.7V to 5.5V)

• Dimensions: 3.15” x 1.425”• Characters are generated by dot

character patterns from 8-bit character codes

-Problems It CausedA potentiometer was needed to adjust the contrast of the screenThe LCD screen did not come with I/O pins to connect the screen to a breadboard, thus we soldered on 11 I/O pins in order to interface with it

Mini push buttons• This is a single pole, single throw

(SPST) switch which means the switch has one pair of contacts (two conductive pieces that touch to complete the circuit) that can either be closed or open

• The rated current is 50 mA-Problems It CausedThe buttons did not stay put on the breadboard well, therefore we adjusted the pins with needle-nose pliers

Voltage Regulator

Used to drop the voltage to 3V to run the motor

There are premade Voltage Regulators available in aVariety of voltages such as 3,5,7,9,12 Volts commonlyFound in different electronic devices

Motor Step Angle (degrees) : 0.92-PhaseRated Voltage: 3VRated Current: 1.7A/Phase5mm Diameter Drive ShaftHolding Torque: 48N.cmNEMA 17 form factor

Power supply

AC – DC power supply12v regulated output1amp Center positive tap

Whats left to do???

PROGRAMMING - Timer- Motor- LEDs- Speaker?

Videos:

http://www.youtube.com/watch?v=WQ9Ge2c3tsE&context=C43b3989ADvjVQa1PpcFPquynMR82UiLub5m95Tqt3KE6kzX7qw2g=http://www.youtube.com/watch?v=WQ9Ge2c3tsE&context=C43b3989ADvjVQa1PpcFPquynMR82UiLub5m95Tqt3KE6kzX7qw2g=

http://youtu.be/WQ9Ge2c3tsE

http://youtu.be/qeNDra_Hby0

The END!