HVAC-CONTROLLER(1)_MANUAL_Final
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This document provides documentation for an HVAC controller that uses a microcontroller to monitor temperature using a thermistor and display the temperature on an LCD. It includes schematics, block diagrams, and software code for the microcontroller to read the thermistor input, convert it to a digital temperature value, and display it on the LCD. The microcontroller also controls LED indicators based on the temperature reading compared to setpoints.
HVAC-CONTROLLER(1)_MANUAL_Final
- 1. HVAC CONTROLLER: MANUAL ECET 340 PROFESSOR WANG DATE: 04/17/2016 Elijah Barner Bryan Quiroz
- 2. Table of Contents 1. Table of Illustrations: Manual.......................................................................................................4 Figure I: Schematic Diagram MCS12G128 - Microcontroller...........................................................4 Figure II: Schematic Diagram MCS12G128 - Microcontroller...........................................................5 Figure III: Schematic Diagram MCS12G128 – Microcontroller.........................................................6 2. Product Specifications: MCS12G128 – Microcontroller..................................................................7 Figure IV: Block Diagram MCS12G128 – Microcontroller................................................................7 Figure V: Block Diagram MCS12G128 – Microcontroller.................................................................7 Figure VI: Schematic Diagram MCS12G128 – Microcontroller.........................................................8 3. Description of Project Operation/User's Manual ...........................................................................9 4. Hardware Block Diagram: ..........................................................................................................10 Figure IV: Block Diagram MCS12G128 – Microcontroller..............................................................10 5. I/O Maps:..................................................................................................................................11 6. Input /Output Specification:.......................................................................................................11 7. Hardware Theory of Operation:..................................................................................................13 8. Software Documentation, Pseudocode, and/or Flow Chart:.........................................................14 Figure VII: Software Code - Freescale CodeWarrior IDE................................................................14 Figure VIII: Software Code - Freescale CodeWarrior IDE...............................................................15 Figure IX: Schematic Diagram MCS12G128 – Microcontroller.......................................................16 9. Software Theory of Operation:...................................................................................................18 10. User’s Manual:......................................................................................................................19 11. SOFTWARE SUPPORT DOCUMENTATION ................................................................................20 A. Software:..............................................................................................................................20 12. APPENDICES (DATA SHEETS, REFERENCE MATERIAL, ETC.):.............................................21
- 4. 1. Table of Illustrations:Manual Figure I: Schematic Diagram MCS12G128 - Microcontroller
- 5. Figure II: Schematic Diagram MCS12G128 - Microcontroller
- 6. Figure III: Schematic Diagram MCS12G128 – Microcontroller
- 7. 2. Product Specifications: MCS12G128 – Microcontroller Figure IV: Block Diagram MCS12G128 – Microcontroller Figure V: Block Diagram MCS12G128 – Microcontroller
- 8. Figure VI: Schematic Diagram MCS12G128 – Microcontroller Thisis schematicdiagramof the MCS12G128 of memorymappingcontrollermostof the associated operationof the HVAC are store onthe FLASHmemory.All of the variouscode functionsforthe LCD, LED’s, ATD,and otherperipheral devicesretrieveinformationforfunctionality.
- 9. 3. Description of Project Operation/User'sManual The HVAC controllerusesThermistor (temperaturesensor)asthe inputdevicestodetectexternal temperature.The A/Dconvertertakesthe analogsignal intodigitalinformationtodisplaythe actual temperature onthe LCD display.The LED’sare usedtoindicate witherthe HVACcontrolleris onor off
- 10. 4. Hardware Block Diagram: Figure VII: Block Diagram MCS12G128 – Microcontroller
- 11. 5. I/O Maps: StatusLEDS HeaterActive LEDS 1 - 4 (Yellow):PortT,Pin7, Output. StatusLCD HeaterActive LCD: PortPA0 – PA2,Output. StatusThermistor HeaterActive Thermistor:PortPAD1,Input. StatusATD HeaterActive ATD:Port PTAD1 – 15, Output/Input. StatusMSC12G128 Microcontroller HeaterActive MSC12G128 bidirectionalInput/Output. 6. Input /Output Specification: Temperature Sensor/Thermistor MC9700A 2.5 to 5 VDCSupply@ 5mA max. 10 mV perdegree Centigrade Type Analog Range:0VDC = 0 degrees/Celsius(mininput) 5VDC = 100 degrees/Celsius(max input) Character LCD Display 3 Rowby 16 Column Parallel Interface 5 VDCSupply@ 50 mA max.
- 12. YellowLEDbacklight ATD Converter:ConversionSpan:0– 5VDC,linear,monolithic Resolution:1-bit=0.0196 VDC= 0.392 degree 0.0VDC = 00H 2.5VDC = 80H 5.0VDC = FFH
- 13. 7. Hardware Theory of Operation: The way that the temperature informationis receivedbythe processorreadingthe thermistor connectedtothe 8-bit ATD converter.The thermistoroutputvoltagewill relative tothe temperature at 10mV/ degree Celsius.The outputdoesn’tneedtobe amplified.Buttoperformance isbasedonthe outputrange.The signal fromthe thermistorisreadbythe processornextthrew 10-bitATD converter at a rate of 0.1 Hz for every10 seconds.Afterwardsthe systembeginsreading,storingthe current temperature,andcalculatinginthe temperature sum.Thenonce the temperaturehadbeenreadbythe ATD converterthe digital value isconvertedtoa similarvalue of temperature inCelsius.The similar value isthendisplayinASCIIformatona textstring.The temperature isthencomparedtothe temperature onsetandthenthe LEDS become activated.
- 14. 8. Software Documentation, Pseudocode, and/or Flow Chart: Figure VIII: Software Code - Freescale CodeWarrior IDE
- 15. Figure IX:Software Code - Freescale CodeWarrior IDE
- 16. Figure X:Schematic Diagram MCS12G128 – Microcontroller
- 17. Figure XI:Schematic Diagram MCS12G128 – Microcontroller
- 18. 9. Software Theory of Operation: The functionwill reada10-bit binaryintegerthat representthe ambienttemperature indegreeCelsius fromthe processor(Atmel Mega16 channel 0 on the ATD converter.Each single bitrepresent - 0.17.708889 degreesCelsius.Nextthe routineconvertseachbinarybitof informationandwill save the three- digitintegerthatwill be saved.LastlycValueswith0bytesrepresentingthe one hundreddigital of digits.Byte onestens,andbytes.All binarybitsare translatedtoASCII
- 20. 11. SOFTWARE SUPPORT DOCUMENTATION A. Software:
- 21. 12. APPENDICES (DATA SHEETS, REFERENCE MATERIAL, ETC.):