Personal Convection Air Device Alpha Design Document
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- The document describes the objectives, components, and control systems for the PCAD Alpha Unit, which is used to verify component design and develop control logic. - The key components are a LabJack measurement unit, Arduino Pro Mini microcontroller, sensors, and OLED display. The LabJack acquires sensor data and controls a heating unit relay. The Arduino displays data on the OLED and controls additional sensors via I2C. - Operations include evaluating the control mechanism, testing an Android UI, and selecting the right Arduino board and sensors. Screenshots show the DAQ software interface and Android app screens. Diagrams illustrate the circuitry and component connections.
Personal Convection Air Device Alpha Design Document
- 1. PCAD Alpha Unit Edward N Carlson ENCarlson Enterprises LLC edwardncarlson@gmail.com www.linkedin.com/in/edwardncarlson/ Tao Jiang Goal Technologies LLC tjiang2000@gmail.com http://www.linkedin.com/in/taojiang2000
- 2. 2 Objectives • Verify Components Design • Develop Control Logic • Make BOM Decision
- 3. 3 PCAD Components • Heating Unit, etc
- 4. Heating Unit Test Module 4
- 5. 5 PCAD Control Unit Overview LabJack TC1 TC2 TC3 TC4 Arduino Pro MINI Convection Temperature Vapor Temperature Mixture Temperature Electronics Temperature Barometric Pressure Sensor Venturi Pressure Primaery Air Inlet Airflow Mixture Outlet Air Flow BingoPC USB DAQFactory Express Android UI End User UI Evaluation Test & Measurement 5 V VS 3.3 V DAC0 I2C Bus SDA SCL Infrared Temperature Sensor OLED Display Heater UART Count Up Count Down INT0 INT1
- 6. LabJack U6 • A USB based measurement and control unit configured with: – A/D: 4 thermocopules, 2 airflow meters and 1 pressure transducer. – Digital Input: Side Door Open/Close. – Digital Output: control one relay tick to control power relay for heating unit. – D/A: provide 3.3 V voltage source for Arduino Pro MINI. 6
- 7. LabJack 7
- 8. BingoPC • Windows 7 64 bits Laptop – DAQFactory Express: Data acquisition and control software used for Alpha Unit Study. – Android UI: PCAD Android App running on Google Android Emulator for UI Evaluation. 8
- 9. Arduino Pro MINI • Micro-controller based on ATmega328 running at 8MHz/3.3V • It controls: – 0.96” OLED for display via UART (serial). – I2C bus master for I2C sensors: barometric pressure and Infrared temperature sensors. – Tri-color LED via 3 PWM outputs – Two Interrupts for Count Up/Down buttons. – Will take over all works from LabJack in Beta. 9
- 10. 10 PCAD Alpha Control Unit 1. OLED Display (picture, text, slide show and movie, etc) 2. 3.3 V grid Powered by DAC0 from LabJack (blue jumper wire) 10. 5V grid powered by VS from LabJack (red jumper wire) 3. Count Up button (Go to next slide) 4. Count Down button (Go to Prev slide) 9. Barometric Pressure Sensor (I2C) 5. Infrared Temperature Sensor (I2C) 8. I2C bus connector 6. Button to Reset OLED Display 7. Arduino Pro MINI Micro-Controller Battery Charger Board 3.7 V 1000mA Battery 11. Relay Tick to Control Heater
- 11. Breadboard Description • LabJack U6: Right side in Red Color and middle row CB37 terminal board in Green. • Battery and Charger: small breadboard at the top row small breadboard. • Arduino Breadboard: large breadboard at the bottom row. – Top part power grid runs 5V from VS of Labjack. – Lower part power grid runs 3.3 V from DAC0. – DO NOT short two power grids together. 11
- 12. Alpha Unit 12
- 13. Shop Vacuum for Suction 13
- 14. Operations and Objectives • There are three different operations. Each of them can run as standalone. – Alpha Unit Study: Control mechanism and control parameters. – Android UI Evaluation: End user interface evaluation. UI only without underneath logic. – Arduino Board Evaluation to choose right components: • Micro-controller: enough I/O support, expandability, capable of running standalone. • Sensors: size, responsiveness, expandability, etc. • Display: size, cost, text, graphic, picture and easy programming. • Development Tool Support: In favor of Open Sourced Tools for lower development cost. 14
- 15. Alpha Unit Study Steps • Power up Bingo PC • Connect USB cable to LabJack • Double click Red DAQFactory Express icon on desktop to start the program. • Inside DAQFactory Express, “File” “Open” and choose file “c:BingoProjectPCADDAQ.ctl” • Go to “Page_0” or “Page_1” to open control pages. 15
- 16. Temperature, Air Flow, Pressure Page 16
- 18. Android UI Evaluation • Power up Bingo PC • Double click P-CAD2.2 icon on the desktop • Wait about 3 minute until Emulator start • Press “Menu” button on Keyboard Panel • P-CAD shows on Home Screen • Click on P-CAD icon to launch the App • Press each tab at bottom to switch screen 18
- 20. Android UI Screens (cont) 20
- 21. Android UI Screens (cont) 21
- 22. Arduino Board Evaluation Arduino Pro MINI • Designed to leave a board embedded in a project • CPU: ATMega 328 8M HZ/3.3 V • 14 digital pin and 6 analog pin • 6 PWM, 2 interrupt lines • Communication: I2C, UART, SPI • Size: 0.7" x 1.3 “ • Development Support: Open-source hardware/software µOLED-96-G1(SGC) • Low-cost OLED display graphics user interface solution • 96 x 64 resolution, 65K true to life colours, • 0.96” diagonal size, 32.7 x 23 x 4.9mm. • No back lighting with near 180° viewing angle. • Comprehensive set of built in high level graphics functions and algorithms that can draw lines, circles, text, and much more. • Display full color images, animations, icons and video clips. 22
- 23. Sensors Under Evaluation BMP085 Barometric Pressure Sensor • I2C digital sensor • Wide barometric pressure range • Includes temperature measurement Infrared Thermometer - MLX90614 • SMBus (I2C) digital sensor • Internal 17 bits ADC • Wide temperature ranges: -40 to 85°C for the ambient temperature and -70 to 382.2°C for the object temperature I2C is a serial bus which allows connecting up to 255 sensors. More sensors will be brought down and controlled by Arduino board in Beta Design. 23
- 24. Arduino Board Operation • Power up Bingo PC • Connect USB cable to LabJack U6 • Arduino board is powered by Labjack U6 • The OLED should show picture in Compound Gallery • Barometric Pressure and Temperature Reading should show on the OLED • Press Count Up/Down button to go Next/Prev picture. • Press OLED Reset button to let OLED to screen saver mode to avoid burn-in effect • Press Reset button on Arduino Pro MINI board to restart the board and OLED will show Compound Gallery again. 24