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Design Constraints Analysis

This document outlines the design constraints and analysis for an advanced pool monitoring and chemical dispensing system. Key features include the ability to accurately measure chlorine concentration, water temperature, and pH levels within ±5% accuracy. The system is designed to log data for 30 days, provide local and remote configuration options, and detect hazardous chemical levels with alarm notifications. Additional design considerations include sufficient memory, power requirements for multiple pumps and a heating element, and waterproofing to enhance durability.

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Design Constraints Analysis

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  1. Design Constraints Analysis Team 15

  2. PSSCs • An ability to measure chlorine concentration, water temperature, and pH with an accuracy of ±5% • An ability to dispense measured amounts of regulatory chemicals into a pool. • An ability to log chlorine concentration, water temperature, and pH data collected over a 30-day period in nonvolatile memory. • An ability to display data logs and configure operating parameters, both locally and remotely. • An ability to detect potentially hazardous chemical concentration levels and sound a local alarm in response and send an E-mail alert.

  3. Controller Design Constraints • Controller: • Ethernet (and sufficient RAM/Flash) to implement the web server. • Enough memory to save the 30-day log of measurements. • ATDs to sample sensor data. • SPI for LCD display. • Enough I/O pins to control the 7 pumps and 3 sensors. • SCI for debugging/updating. • PWM to implement an alarm for dangerous chemical levels.

  4. Power Design Constraints • There will be 8 pumps and a electric heating element. • Power should support the hefty load of the pumps and heating element. • 3.3V is required for the controller. • 5V is required for serial shift register.

  5. Other Design Constraints • Need to isolate (optically) pins from pumps due to the high current draw. • Water resistant, design for splashes and waterproof our circuits. • Need of an amplifier to make the alarm effective.

  6. Component Selection • MC9S12NE64

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