1. Leader: Amos Friend Hardware Specialist:Luke Noschese Software Specialist: Jacob Longwill Assistant: Ryan Trump By: Team Leroy Jenkins

2. Understand the Problem NimH Batteries Charge and discharge graphs Hardware Software Summary References Q&A

3. Power Systems Clean accurate power to respective components Safeguard against destroying components with too much power Understanding power output of the batter as it drains Displaying battery life Use on-board LED to change color depending on battery life.

4. Battery NiMH (Nickel-Metal Hydride) LM2940 or 4941 LDO Regulator (5v Volts) MCP1702 or 1700 LDO Regulator(3.3 Volts) 2x 4.7KΩ 5 Capacitors of different values

5. Nickel–metal hydride battery Does not have Memory Effect as NiCd did 7.2v battery Output can go as high as ~9.5v when fully charged 3000mAh battery 6-cell Each cell 1.2v 3000mAh

9. Different groups have different 5v and 3.3v regulators Use only two voltage regulators 1 – 5v regulator 1 – 3.3v regulator 3 outputs Directly from Nimh battery 5v output 3.3v output

10. Voltage Divider If full battery voltage is supplied it will destroy the port Divide voltage in half Multiply by 2 in code To display correct voltage on LCD Remember to ground the board and battery to a common ground

11. Large capacitor is needed after 5v regulator for rapid power drain from servo

12. 5 V OLTS @ M AX 1 AMP M AX INPUT 26V L OW DROPOUT VOLTAGE 500mV @ 1A

13. 5 V OLTS @ M AX 1 AMP M AX INPUT 26V L OW DROPOUT VOLTAGE 250mV @.5A

14. 3.3 Volt Operation range 2.5v-6v Output current 250mA Low Dropout Voltage 350 mV typical @ 250 mA (VOUT = 2.5V) Looks similar to a transistor

15. 3.3 Volt Operation range 2.8v-13.2v Max out 250mA Low Dropout Voltage 625 mV typical @ 250 mA (VOUT = 2.8V) Looks similar to a transistor

16. Flowchart for battery output

17. Varibles #define VBMIN 500 int VBATT; FB_RGB_ENABLE; FB_RGB_ON; Call Batcheck In Forever Loop

18. void BATCHECK(void){ ADCSC1 = 10; // start 11-bit ADC on PTD3 WAITFOR(ADCSC1_COCO); // wait for conversion complete (new technique) VBATT = ((((ADCR * 500)/1023)*2)); if (VBATT >= VBMIN && VBATT < VBMIN*(3/2)) { FB_RGB_BLUE = 0; FB_RGB_GREEN = 1; FB_RGB_RED = 0; }

19. else if(VBATT < VBMIN) { FB_RGB_BLUE = 1; FB_RGB_GREEN = 1; FB_RGB_RED = 0; motorDC = 0; } else { FB_RGB_BLUE = 1; FB_RGB_GREEN = 0; FB_RGB_RED = 1; }

22. P ROBLEM S TATEMENT DISTRIBUTING PROPER VOLTAGE TO VARIOUS PARTS OF THE SMART CAR MONITORING BATTERY STATUS H ARDWARE R EQUIREMENTS / CONCEPTS INTERFACE S OFTWARE D ESIGN C ODE

23. 250 MA Low Quiescent Current LDO Regulator." Microchip Technology Inc. Microchip Technology Inc., n.d. Web. 11 Mar. 2014. "ALIMENTAZIONE." ALIMENTAZIONE. N.p., n.d. Web. 11 Mar. 2014. "L4941 Very Low Drop 1A Regulator." STMicroelectronics, n.d. Web. 11 Mar. 2014. "LM2940/LM2940C 1A Low Dropout Regulator." Texas Instruments. Texas Instruments, n.d. Web. 11 Mar. 2014. "Nickel–cadmium Battery." Wikipedia. Wikimedia Foundation, 28 Feb. 2014. Web. 11 Mar. 2014. "PDIP | ChipKIT Development Platform." ChipKIT Development Platform. N.p., n.d. Web. 11 Mar. 2014. "Voltage Divider." Wikipedia. Wikimedia Foundation, 03 JulY2014. Web. 11 Mar. 2014. MCF51JM128 Reference Manual Notebook reference CET 335 lab 7 Analog to Digital Input