TEAM G.O.A.T.ZPOWER SYSTEM

TEAM MEMBERS

TEAM LEADER: TYLER LEAKESOFTWARE SPECIALIST: HEATHER AHLIN

HARDWARE SPECIALIST: HUNTER DETWILERASSISTANT: JONATHAN PATZ

1

OVERVIEW

• Problem statement• Requirements/ constraints

• Hardware• Components• Interface

• Software• Code for initialization, operation

• Q&A

2

PROBLEM STATEMENT: POWER SYSTEM

• Distribute the appropriate voltage to each component on the Smart Car

3

REQUIREMENTS/CONSTRAINTS

• Supply 5v going to cold fire, steering servo, line sensor, etc.• Supply 3.3v going to wireless X BEE

chip (for future use)• Supply raw voltage to motor • Calculate battery level and display it

through RGB LEDs • Shut system down when it drops

below 6.1v.

• Schedule• Size of breadboard• Safety• Don’t operate battery below

6V

4

• Components• Ni MH 7.2 V Battery• LM2940 LDO (Low Drop Out) Regulator ~5V• MCP1702 LDO (Low Drop Out) Regulator ~3.3V• Pololu 12A Chip• Two 4.7kΩ Resistors(Voltage divider) • Capacitors (22µF, .47µF, two 1µF)• Potentiometer

5

HARDWARE

BATTERY

• 7.2v Ni MH• 3000 mAh• Six 1.2 V cells in pack • The max voltage for the batteries can vary. Our battery

maxed out around 8.6V but others may go up to almost 10V

6

LM2940 LDO REGULATOR

• This regulator is used to drop the voltage to 5V.• Vin Range = 6.25V(5.5V

min) – 26V• Make sure the pins are

correctly connected

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LM2940 LDO REGULATOR

• Without capacitors the voltage will read around 8V.• 8v will damage the

firebird 32 processor• After the capacitors are

added you will get around 5V for Vout. 8

MCP1702 LDO REGULATOR

• This regulator is used to drop the voltage to 3.3V.• This regulator is only

used for the Wireless communication

9

MCP1702 LDO REGULATOR

• Two 1µF capacitors are added on each side.• Notice that the Vout leads to

nowhere, it will be used for future applications.(wireless comm.)

10

• PIN 9, VOUT is raw voltage from Battery• PIN1, INA will receive 5V

11

Pololu 12A Chip

A-D CONVERSION

• Two 4.7kΩ Resistors• Jumper Wire from VREFH to

+5V

12

SOFTWARE

• #DEFINE’s• ADC Initialization• RGB LED Initialization• Main

• ADC• Battery Voltage• Decision

• Functions

13

#DEFINE

• #define redLED PTED_PTED3 • #define grnLED PTED_PTED2

14

ADC INITIALIZATION

• Using ADC Channel 11APCTL2 |= APCTL2_ADPC11;

// disable PTD4 as GPIO (enable for A/D)

15

RGB LED INITIALIZATION

• I/O Ports to initialize:// RGB ENABLEPTGDD |= PTGDD_PTGDD1_MASK; // (2U) make PTG1 an output for RGB LED

PTGD_PTGD1 = 1; // Set G1 high to enable the RGB LED (+)// RED LEDPTEDD |= PTEDD_PTEDD3_MASK; // (8U) make PTE3 an output for redLEDPTED_PTED3 = 1; // Turn OFF red LED (Neg. True Logic)// GREEN LEDPTEDD |= PTEDD_PTEDD2_MASK; // (4U) make PTE2 an output for grnLEDPTED_PTED2 = 1; // Turn OFF green LED (Neg. True Logic)

16

17

MAIN

Void main()

ADCSC1 = 11; // start conv. on ch11WAITFOR(ADCSC1_COCO); // wait for conversion

completeint BTxTEN = ADCR*100/1024;// (Variable) Battery level x

10… 1

8

BTXTEN

• Battery Voltage multiplied by ten.• Vin = 0V-5V, representing

0V-10V• ADCR = 0-210 = 1023• BTxTEN = ADCR *100/1024 • 7.2V ~ 72, 6.6V ~ 66, 6.1V

~ 63 19

MAIN, DECISION

if (BTxTEN >= 72) // Battery Above 7.2V grnLED(); // Show Greenelse if (BTxTEN >= 66) // Battery Above 6.6V ylwLED(); // Show Yellowelse if (BTxTEN >= 63) // Battery Above 6.1V redLED(); // Show Redelse // Battery Below 6.1V SHUTDOWN(); // FAIL SAFE

20

GREEN LED

// GREEN LED - Ensure only green LED is litvoid grnLED(void)

grnLED = 0; //Turn on green LEDredLED = 1; //Turn off RED LED

21

RED LED

// RED LED – Ensure only the red LED is litvoid redLED(void)

grnLED = 1; //Turn off green LEDredLED = 0; //Turn on RED LED

22

YELLOW LED

// YELLOW LED – MIX Green and Red LEDs to make Yellowvoid ylwLED(void)

grnLED = 0; //Turn on green LEDredLED = 0; //Turn on RED LED

23

EMERGENCY SHUT DOWN

// SHUTDOWN MOTORvoid SHUTDOWN(void)

PTED_PTED3 = 1; //Turn off RED LEDMotorDC = 0; //Shut down Motor under 6.1VTPM2SC = 0x00; //Turn off TPM2 as fail safe

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SUMMARY

• We showed you how to supply 5v going to cold fire, steering servo, line sensor, etc.• Supply 3.3v going to wireless X BEE chip • Supply raw voltage to motor • Calculate battery level and display it through RGB LEDs • Shut system down when it drops below 6.1v

25

REFERENCES

• "Voltage Dividers." Voltage Dividers. N.p., n.d. Web. 07 Mar. 2017.• Mcf51Jm128, Document Number:, and 6/2009 Rev. 3. Document Number:

MCF51JM128 (n.d.): n. page. Web.• "CET360 Microprocessor Engineering." CET360 Microprocessor Engineering. N.p.,

n.d. Web. 07 Mar. 2017.• In. LM2940/LM2940C 1A Low Dropout Regulator (n.d.): n. page. Web.• Inc, Microchip Technology. MCP1702 250 MA Low Quiescent Current LDO Regulator

(n.d.): n. page. Web.• "Embedded Systems Week." IEEE Embedded Systems Letters 2.3 (2010): 96. Web.

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REFRENCES

• "ThreadX and the ColdFire Microprocessor." Real-Time Embedded Multithreading Using ThreadX (2009): 439-88. MCF51JM128 Reference Manual. J Sumey, 2 June 1995. Web. 10 Mar. 2017.• Sumey, J. Firebird 32 Nano Schematic. Digital image.

Http://www.aet.calu.edu. N.p., n.d. Web.• Sumey, J. "SC Lab 3." SC Lab 3. N.p., 2 Mar. 2017. Web. 08 Mar.2017• "Voltage Dividers." Voltage Dividers. N.p., n.d. Web. 08 Mar. 2017.

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QUESTIONS!

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