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

19. 10. User’s Manual:

20. 11. SOFTWARE SUPPORT DOCUMENTATION
A. Software:

21. 12. APPENDICES (DATA SHEETS, REFERENCE MATERIAL,
ETC.):