A Performance Analysis System for the Sport of Bowling

2.5 HARDWARE IMPLEMENTATION.
The following is a summary of the SMARTDOT module's hardware configuration and an
overview of the hardware theory of operation. A working prototype of the SMARTDOT
sensor module (based on this hardware configuration) has been used under real-world
conditions (placed in a ball and rolled down the lane) for a total of about 500 frames (~50
games).
2.5.1 Hardware Configuration
A summary of the major hardware components and their respective features is given
below. See Figure 2-3 for a block diagram of the prototype SMARTDOT module.
Microprocessor - Phillips 87C752 [21]
• Intel 8051-based core.
• Crystal Frequency - 3.6864 MHz (3.26 µsec instruction cycle).
• 64 bytes on-board RAM (including general purpose registers and stack space).
• 2 Kbytes on-board program EPROM.
• 8-bit Analog-to-Digital Converter (130 µsec conversion time @ 3.6864 MHz).
• 16-bit auto reload timer.
• Additional fixed timer (300 Hz @ 3.6864 MHz).
• Interrupts (timers, external, ADC).
• Idle mode.
Light Sensor - TAOS TSL251 Light-to-Voltage Converter [23]
• Output: 60 mV/(µW/cm 2 ), 7.5 µsec rise/fall time.
Memory - Microchip 24C04 Serial I 2 C EEPROM (4096 bits, 512 x 8) [20]
• 8 byte page write.
• 10 msec maximum write time per page.
• 400 kHz maximum clock rate.
Amp Sensors Piezoelectric Film Sensor [19]
• Responds to changes in pressure.
Maxim MAX931 Ultra-Low Power Comparator [18]
• Current draw: