1. © 2008 RoboRubik1 11 Technical Communication Skills Practicum Theory of Operation and Hardware Design Narrative

2. © 2008 RoboRubik2 2 Major Components 2© 2008 RoboRubik Freescale MC9S12C32MFA25 Microcontroller 5V operating voltage ~16Mhz operating frequency SPI/SCI connections Lantronix WiPort Wireless Network Device 3.3V operating voltage Embedded web server Direct TCP/IP to serial connection

3. © 2008 RoboRubik3 3 Additional Components 3© 2008 RoboRubik TT Electronics OVSRRGBCC3 LED (x48) 3 anode, 1 cathode Allegro A6276 LED Driver Integrated Circuit (x12) Latched LED drivers Input shift register via serial connection NKK UB Illuminated Pushbutton (x6) Pushbutton with embedded LED 1-to-16 Channel Multiplexer Determine which LED driver to receive serial data

4. © 2008 RoboRubik4 4 Additional Components 4© 2008 RoboRubik 9V Power Supply RECOM R-78xx-0.5 DC-DC Converter (x2) For transforming 9V to 5V and 3.3V operating levels Maxim IC MAX3221EAE RS-232 level translator Increase SPI signal (WiPort / 9S12) from 3.3V to 5V

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7. 7 7 Hardware Narrative 7© 2008 RoboRubik User accesses website through static-IP:port 80 Selects from different operating modes Request is posted on another port number and is transmitted via TCP/IP to WiPort, then directly onto serial connection Signal from serial port is sent to RS-232 chip, level translated to micro operating specifications, continues onto micro Micro acquires SPI signal data, initializes cube state in software If user selected “play” mode, cube is initialized to a solved state

8. © 2008 RoboRubik8 8 Hardware Narrative 8© 2008 RoboRubik Serial signal is tied from SCI port to all 12 LED drivers Four I/O pins determine which LED driver to send clock signal Clock low-to-high signals for new shift register bit Once all data is sent, LATCH ENABLE driven high and OUTPUT ENABLE driven low will change LED display Each pushbutton wired to an I/O pin Pushbutton will signal interrupt, micro will begin computing changes in LED display

9. © 2008 RoboRubik9 9 Questions