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Eco Car Dashboard Display. ECE 345 Senior Design Project By Edward Wells and Darren Shea TA: Ajay Patel. Layout of Presentation . Introduction to EcoCar 2000 HEV Objective Original Design Software Overview Hardware Overview Costs and Labor Recommendations.

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eco car dashboard display

Eco Car Dashboard Display

ECE 345 Senior Design Project

By

Edward Wells and Darren Shea

TA: Ajay Patel

layout of presentation
Layout of Presentation
  • Introduction to EcoCar 2000 HEV
  • Objective
  • Original Design
  • Software Overview
  • Hardware Overview
  • Costs and Labor
  • Recommendations
objectives
Objectives
  • Design display which is more suited to the EcoCar 2000 HEV
  • Design dashboard to work in conjunction with network and cruise control
  • Retrieve information from the network
  • Display the information on a LCD display panel
original design
Original Design
  • To design dashboard display suitable for Hybrid Electric Vehicle with backlit LCD display for digital information
  • Pertinent information to be received from EcoCar network team via serial communications link
  • Original analog speedometer and tachometer dials to be retained for better visualization of changes in these values
lcd initialization subroutine
LCD Initialization Subroutine

Problems

  • No provided documentation
  • Pins and connector
  • LCD busy signal
  • Enable line
  • Different on-board chip
displaying string messages
Displaying String Messages

Purpose:

  • To become familiar with sending commands and data to the LCD display
  • Initial Demonstration
speedometer lcd output
Speedometer LCD Output

Problems

  • Scaling data

Output = input * 0.5

Resolution

  • Trying to scale analog input should have been binary conversion
tachometer lcd output
Tachometer LCD Output

Problems

  • Scaling data

Output = (input *3- 65)/10

  • Same conclusion as speedometer output
  • Warning light never functioned properly, used non-scaled binary value
analog data output
Analog Data Output

PROBLEMS

  • Tried to use same control lines with inverter for both Digital to Analog Converters
  • In theory, should have worked, but data not latched properly
  • Simpler solution, use two more control lines
delay function
Delay Function
  • 0.587ms time delay
  • LCD busy signal

0.35 ms

  • Used delay function instead of reading LCD busy signal
  • Long delay(25ms)

for refreshing of screen

digital to analog converter
Digital to Analog Converter
  • Based on DAC 0830
  • Controlled by micro controller
  • MC1404 used for accurate reference voltage
dac calculations
DAC calculations

Iout = (VREF/15k) x (Digital input)/255

VREF = (Iout x 15k)/( 15k x 255/256)

Iout = Vout­/15k

Vout = 4V therefore Iout = 2.667 x 10-4 A

Which gives:

VREF = 4.016V

So for a single step,

Iout = 1.0459x10-6A

Vout= 15.6882mV

timing diagram
Timing Diagram
  • Microprocessor writes to one port
  • Chips switched on and off corresponding to data on port
  • Data latched when WR goes high
voltage to frequency converter
Voltage to Frequency Converter
  • Provides pulse train for odometer driver
  • LF411 used as integrator for higher accuracy
  • Low tolerance, low thermal coefficient components, required for high accuracy
vfc correction circuit
VFC Correction Circuit
  • Non-inverting amplifier
  • High gain to clean pulse train
  • Adjustable off set to make pulse train positive
vfc calculations
VFC calculations

Fout = (-Vin/2.09) x (Rs/Rin) x (1/RtCt)

Max input voltage = -4.1V

Max required frequency = 90Hz

Rs = 12.1k

Rin = 100k

Ct = 0.01uF

90 = (4/2.09) x (12.1/100) x (1/(Rt x 0.01x10-6)

Rt = 257.3k

The closest value in the E12 series is 220k

odometer driver
Odometer Driver
  • CS8441 odometer driver
  • Frequency input
  • Calculates correct sequence for stepper motor
gauge controller
Gauge Controller
  • CS8190 air core gauge driver
  • Voltage input used instead of frequency
  • LF411 drives voltage into chip bypassing frequency conversion circuits
costs labor
Costs & Labor

Labor

Typical EE entry salary $50,000/year * 1 year / 240 days * 1 day / 8 hours = $26/hour

$26/hour * 2.5 * 150 hours = $9,750per person

Total Labor = $19500

Parts

LCD display $38

68HC11 Microcontroller $30

Resistors, Capacitors $5

DAC 0830 $ 7.08 x2

LM331 $ 8.16

LF411 $1.27 x 3

LM741 $0.46 x4

CS8190 $2.80 x 2

CS8441 $2.00

Total Parts = $108.57

Total Costs = $19,608.57

recommendations
Recommendations
  • Wanted to interface with network and cruise control teams, display in EcoCar
  • Backlit LCD display
  • Add more functionality

e.g. More warning lights, more complex LCD display