Distance Measuring Car

Apply the Radio Control car by attached the rotary encoder

as a sensor to the Radio Control car’s wheel for measure the

distance that car was done. Infrared module and rotary

encoder around car’s wheel act as the digital signal for MCS51 Microcontroller to use for calculate with fixed

circumference of wheel to know how far of the distance had

run by the car. The precision of the measurement is 1/84 round

of wheel due to use 84 holes rotary encoder. Calculate and

display on the 4-digits 7-Segment on the car. The error of measuring is about 2.5 cm. in 100 centimeter, depend on

surface that the car move on.

1. For study about measurement.

2. For study about each electronics devices.

3. For future generations to study.

Design (Design Diagram)

Circuit Design

Circuit Simulation

Build PCB

Assembly

Testing

Photodiode

encoderIC89C51

Segment

display

4 digit

Photodiode Encoder

Rotary Encoder

MCS51 Controller

7-Segment LED Display

Photodiode Encoder sensors are used to find position of the wheel. It consists of IR LED and Photodiode mounted facing each other enclosed in plastic body. When light emitted by the IR LED is blocked because of alternating slots of the encoder disc logic level of the photo diode changes. This change in the logic level can be sensed by the microcontroller or by discrete hardware. This sensor is used to give position feedback to the robot.

http://robotsforroboticists.com/motor-types/

Photo from http://imgarcade.com/1/optical-encoder-arduino/

When distance measuring car

movement the photodiode encoder will

take input to IC then an IC will processing by software (The firmware for

distance meter was written in c with IC compiler). After that An IC will calculate,

memory and send to segment display.

1. Radio controlled cars over 50 meter

far from controller

2. Less than 2.5% Distance

Measurement Error

3. Display on 4 digits ½ inch 7-

Segment Display

4. Powered by car battery

Summary Summary of this project is to create and design a measurement and calculate

distance the digital. That can show up out through the display. Measure the distance it can show up as a unit centimeter and meters. The display of the measuring distance. We used photo diode encoder to calculate the distance.

Problem & Solution

Problem of measure car. When we backward car but value not increase. How to solve the problem is to put the 2 sensor and adjust the program assemble

Suggestions for the development of this project

This is beneficial for the project may be used to measure the sensor 2 times backwards, or insert a Memory so that it can be used to control remote value safe car, go in the direction we want. Increase the distance of the measuring range, the more value.

Assembly Code ORG 0000H

LJMP INIT

ORG 000BH

LJMP TIME

ORG 0030H

INIT: MOV P0,#00

MOV P2,#00

MOV P1,#0FFH

MOV P3,#0FFH

MOV R0,#00 ; GP

MOV R1,#00 ; GP

MOV R2,#00 ;

MOV R3,#00 ;

MOV R4,#00 ;

MOV R5,#00 ; Delay

MOV R6,#00 ; Delay

MOV R7,#00 ; Delay

MOV 50h,#00

MOV 51h,#00

MOV 52h,#00

MOV 53h,#00

MOV 54h,#00

MOV 55h,#00

SETB 56h

;---> Main Loop -----------------------------------------------------

MAIN: LCALL DISP ; Display

LCALL DLAY

MN20: JNB P3.1,MN21 ; Sensor

CLR 56h

LJMP EMN2

MN21: JB 56h,EMN2

SETB 56h

MOV A,P1 ; cm/rd

CPL A

MOV R4,A

MN22: INC 55h ; Count --.--XX

MOV A,55h

CJNE A,#10,MN23

MOV 55h,#00

INC 54h

MOV A,54h

CJNE A,#10,MN23

MOV 54h,#00

INC 53h ; Count

MOV A,53h

CJNE A,#10,MN23

MOV 53h,#00

INC 52h

MOV A,52h

CJNE A,#10,MN23

MOV 52h,#00

INC 51h

MOV A,51h

CJNE A,#10,MN23

MOV 51h,#00

INC 50h

MOV A,50h

CJNE A,#10,MN23

MOV 50h,#00

MN23: DJNZ R4,MN22

EMN2: NOP

LJMP MAIN

;---> Display -------------------------------------------------------

DISP: SETB P2.0 ; Display

SETB P2.1

SETB P2.6

SETB P2.7

DS00: INC 60h

MOV A,60h

CJNE A,#04,DS10

MOV 60h,#00

MOV A,60h

DS10: CJNE A,#00,DS20

MOV DPTR,#TAB2

MOV A,50h

MOVC A,@A+DPTR

MOV P0,A

CLR P2.6

LJMP EDSX


MOV DPTR,#TAB1

MOV A,51h

MOVC A,@A+DPTR

CLR ACC.4 ; Dot

MOV P0,A

CLR P2.1

LJMP EDSX


MOV DPTR,#TAB2

MOV A,52h

MOVC A,@A+DPTR

MOV P0,A

CLR P2.7

LJMP EDSX


MOV DPTR,#TAB1

MOV A,53h

MOVC A,@A+DPTR

MOV P0,A

CLR P2.0

LJMP EDSX

DS50: NOP

EDSX: RET

TAB1: DB 014H,0D7H,031H,091H,0D2H,098H,018H,0D5H,010H,090H

DB 03BH

; EDC.BGAF

TAB2: DB 088H,0BBH,0C2H,092H,0B1H,094H,084H,0BAH,080H,090H

; .CDEGBFA

;---> Timer 0 Interrupt ---------------------------------------------

TIME: NOP

ETIM: RETI

DLAY: MOV R7,#00

DJNZ R7,$

RET

HLAY: MOV R6,#00

HL00: MOV R7,#00

DJNZ R7,$

LCALL DISP

DJNZ R6,HL00

RET

HHLY: MOV R5,#06

HH00: MOV R6,#00

HH01: MOV R7,#00

DJNZ R7,$

DJNZ R6,HH01

DJNZ R5,HH00

RET

END

Chairat Pipitagule 5411300040

Thanawin Surakit 5411300060

Krishnaphat Mingsamdang 5411300370

Prapoj Iemsanguan 5411301390

Panjapong Loysawai 5411301470

CM 50 Avionics division

Civil Aviation Training Center

Distance Measuring Car

Engineering

Transcript of Distance Measuring Car