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Digital Bicycle

SpeedometerNitish Kumar 

 Aerospace 4th year IIST 

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Equation evolved

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How to measure rotation

• Change of voltage from 5v to 0observed

•

Interrupt module is used for watchingon “Falling edge”

• Timer 1 is used for 1 sec interrupt

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IR Sensor

• IR light of 38 kHz falls on receiverthen its output is low otherwise itshigh

• Blink of led indicates one rotation

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IR Receiver TSOP 1738

• Photo detector

• Output active low

•

Disturbance from other signal liketungsten bulb or sunlight aresuppressed

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PIN Configurations

LCD Module

LCD Module Pin configuration

1 VSS(GND Supply)

2 VCC (+5V)

3 VEE (Contrast Adjust)

4 RS

5 R/W

6 E

7 DB08 DB1

9 DB2

10 DB3

11 DB4

12 DB5

13 DB6

14 DB7

15 LED+

16 LED-

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Connection withMicrocontroller

• RS - PORTB Bit 0

•

RD - PORTB Bit 1

• EN - PORTB Bit 2

• D4 - PORTB Bit 4

• D5 - PORTB Bit 5

• D6 - PORTB Bit 6

• D7 - PORTB Bit 7

Fig: Connection

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LCD Pins

• Register Select (R/S) - SendingInstructions or Sending Characters toPORT

• Read/Write (R/W) - This pin is high if we want to read from LCD and low if we want to write on LCD

• Clock (Enable) - This pin getstoggled high-low to "clock in" thedata that is on the data pins to PORT

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Power Supply

• AC to DC• 4 bridge fullwave rectifier

• VoltageRegulator

• LM7805 input upto 24v outputremains 5v

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The Full Wave BridgeRectifier

Positive Half-cycle

Bridge

The NegativeHalf-cycle

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LM7805 VoltageRegulator

Capacitor is to filter out the noise andvoltage variations from the inputsource and is usually necessary when

transformer and rectifier is used forsupplying input to the capacitor.

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Program

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