digital speedometer with 8051 Microcontroller

[edzahid]

hi
i have an idea to build digital speedometer with distance travel in kilometer/meter ,show the speed (km/h) and to find how much distance total distance.
need to press push botton if wanna to display other measurement.

i want to use 16x2 lcd, 8051 cip, and Photomicrosensor or hall-effect sensor.

I want to use it in my Bicycle and further in my bike
sensor should be easy to install and simple too
How to start?

[Binu]

Its a good project, You can use hall effect sensor. Measure the distance traveled for one revolution of the wheel.
For each revolution's you can measure the Distance traveled. From the distance you can get the speed with respect to time.
Use AT89C2051 microcontroller.

[edzahid]

Can you help me with the schematic diagram?

[Binu]

Use this circuit, do needed changes for AT89C2051 microcontroller

[ankitloud]

sir can you give me the code of this project ankitloud@gmail.com

ankit sharma

[Binu]

You can download the source code from here

[shenoy]

Hi

I have an idea to build a speedometer for bikes using magnets ... I have thought of using reed switch as the sensing element and I need your help in building the basic circuit .... I have seen the above circuit diagram..

1) what modification is needed in the above ckt ?
2) which microcontroller is required for this project ...?

Please provide me with the circuit diagram ...
waiting for your sooner reply ...

Regards,
shenoy

shenoy

[Binu]

The reed switches cant sense for high speed. you have to use the Hall effect sensors.

[edzahid]

hi again mr binu.

here is my progress on electronic speedometer..

here is my circuit.. the there is no sensor connection.. because only use one wire.
fyi..im using photo diode sensor...


here is my actual circuit.. before this..im using assembly to test the connection LCD and Switch to 8051.. and i manage to get the result..
*when on the power*

*button 1 pressed*

*button 2 pressed*

*button 3 pressed*


and here is the coding im used ..

SW1 EQU P3.0
SW2 EQU P3.1
SW3 EQU P3.2

INIT: MOV A,#38H ; initialization
ACALL CMD 	; issue command
MOV A,#0EH 	; LCD On, cUrsor ON, cursor blinking OFF
ACALL CMD
MOV A,#01H 	; Clear LCD
ACALL CMD
MOV A,#06H 	; Shift cursor right
ACALL CMD
MOV A,#82H	; Cursor: line 1, position 2
ACALL CMD	
MOV A,#3CH	; 2nd line
ACALL CMD
MOV A,#01000101B	; E
ACALL DISPLAY
MOV A,#01001100B	; L
ACALL DISPLAY
MOV A,#01000101B	; E
ACALL DISPLAY
MOV A,#01000011B	; C
ACALL DISPLAY
MOV A,#01010100B	 ;T
ACALL DISPLAY
MOV A,#01010010B	; R
ACALL DISPLAY
MOV A,#01001111B	; O
ACALL DISPLAY
MOV A,#01001110B	; N
ACALL DISPLAY
MOV A,#01001001B	; I
ACALL DISPLAY
MOV A,#01000011B	; C
ACALL DISPLAY
MOV A,#0C3H       ; JUMP TO 2nd LINE, position 3
ACALL CMD
MOV A,#01010011B ; S
ACALL DISPLAY
MOV A,#01010000B	; P
ACALL DISPLAY
MOV A,#01000101B	; E
ACALL DISPLAY
MOV A,#01000101B	; E
ACALL DISPLAY
MOV A,#01000100B ; D
ACALL DISPLAY
MOV A,#01001111B	; O 
ACALL DISPLAY
MOV A,#01001101B	; M
ACALL DISPLAY
MOV A,#01000101B	; E
ACALL DISPLAY
MOV A,#01010100B	 ;T
ACALL DISPLAY
MOV A,#01000101B	; E
ACALL DISPLAY
MOV A,#01010010B	; R
ACALL DISPLAY


POLL:
        SETB SW1
        SETB SW2
        SETB SW3
        JNB SW1,SW1_Tmp
        JNB SW2,SW2_Tmp
        JNB SW3,SW3_Tmp
        JMP POLL

SW1_Tmp:
        AJMP DISP_SW1
SW2_Tmp:
        AJMP DISP_SW2
SW3_Tmp:
        AJMP DISP_SW3
        JMP POLL

DISP_SW1:
MOV A,#01H 	; Clear LCD
ACALL CMD
MOV A,#80H	; Cursor: line 1, position 3
ACALL CMD
MOV A,#3CH	; 2nd line
ACALL CMD
MOV A,#01010011B ; S
ACALL DISPLAY
MOV A,#01110000B ; p
ACALL DISPLAY
MOV A,#01100101B ; e
ACALL DISPLAY
MOV A,#01100101B ; e
ACALL DISPLAY
MOV A,#01100100B ; d
ACALL DISPLAY
MOV A,#00101000B ; (
ACALL DISPLAY
MOV A,#01101101B ; m
ACALL DISPLAY
MOV A,#00101111B ; /
ACALL DISPLAY
MOV A,#01110011B ; s
ACALL DISPLAY
MOV A,#00101001B ; )
ACALL DISPLAY
MOV A,#0C1H       ; JUMP TO 2nd LINE, position 13
ACALL CMD
MOV A,#00110000B ; 0 
ACALL DISPLAY
MOV A,#00101110B ; .
ACALL DISPLAY
MOV A,#00110000B ; 0 
ACALL DISPLAY

JMP POLL                ; JUMP TO POLL FOR NEW KEY PRESS

MOV A,#B ; 
ACALL DISPLAY

DISP_SW2:
MOV A,#01H 	; Clear LCD
ACALL CMD
MOV A,#80H	; Cursor: line 1, position 3
ACALL CMD
MOV A,#3CH	; 2nd line
ACALL CMD
MOV A,#01000011B ; C
ACALL DISPLAY
MOV A,#01110101B ; u
ACALL DISPLAY
MOV A,#01110010B ; r
ACALL DISPLAY
MOV A,#01110010B ; r
ACALL DISPLAY
MOV A,#01100101B ; e 
ACALL DISPLAY
MOV A,#01101110B ; n 
ACALL DISPLAY
MOV A,#01110100B ; t 
ACALL DISPLAY
MOV A,#00100000B ; 
ACALL DISPLAY
MOV A,#01000100B ; D
ACALL DISPLAY
MOV A,#01101001B ; i 
ACALL DISPLAY
MOV A,#01110011B ; s
ACALL DISPLAY
MOV A,#01110100B ; t 
ACALL DISPLAY
MOV A,#01100001B ; a 
ACALL DISPLAY
MOV A,#01101110B ; n 
ACALL DISPLAY
MOV A,#01100011B ; c 
ACALL DISPLAY
MOV A,#01100101B ; e 
ACALL DISPLAY
MOV A,#0C1H       ; JUMP TO 2nd LINE, position 16
ACALL CMD
MOV A,#01101101B ; m
ACALL DISPLAY
JMP POLL

DISP_SW3:
MOV A,#01H 	; Clear LCD
ACALL CMD
MOV A,#80H	; Cursor: line 1, position 3
ACALL CMD
MOV A,#3CH	; 2nd line
ACALL CMD
MOV A,#01010100B ; T
ACALL DISPLAY
MOV A,#01101111B ; o
ACALL DISPLAY
MOV A,#01110100B ; t 
ACALL DISPLAY
MOV A,#01100001B ; a 
ACALL DISPLAY
MOV A,#01101100B ; l 
ACALL DISPLAY
MOV A,#00100000B ; 
ACALL DISPLAY
MOV A,#01000100B ; D
ACALL DISPLAY
MOV A,#01101001B ; i 
ACALL DISPLAY
MOV A,#01110011B ; s
ACALL DISPLAY
MOV A,#01110100B ; t 
ACALL DISPLAY
MOV A,#01100001B ; a 
ACALL DISPLAY
MOV A,#01101110B ; n 
ACALL DISPLAY
MOV A,#01100011B ; c 
ACALL DISPLAY
MOV A,#01100101B ; e 
ACALL DISPLAY
MOV A,#0C1H       ; JUMP TO 2nd LINE, position 3
ACALL CMD
MOV A,#01101101B ; m
ACALL DISPLAY
JMP POLL


CMD:
MOV P1,A
CLR P3.5
CLR P3.4
SETB P3.3
CLR P3.3
ACALL DELAY
RET;

DISPLAY:MOV P1,A
SETB P3.5
CLR P3.4
SETB P3.3
CLR P3.3
ACALL DELAY
RET;

DELAY: CLR P3.3
CLR P3.5
SETB P3.4
MOV P1,#0FFh
SETB P3.3
MOV A,P1
JB ACC.7,DELAY

CLR P3.3
CLR P3.4
RET;

END

and here is the model im using to test this electronic speedometer..


here is my sensor.. i already test this sensor..and its work well
as nothing block his way.. it will send voltage, v=0.15v
and if that this block his way.. output voltage is v=5.10v


so the main problem here is..im not really good at writing a program in assembly either in c language..
so if u can help me with this.. here is my email.. ed_zahid@yahoo.com

*1st button=show the speed (m/s)
*2nd button=show current distance travel
*3rd button=show total distance travel
*using atmel 89S51
*12Mhz crystal
*LCD LMB162ABC

[Binu]

I have replied you here
http://www.8051projects.info/forum/t...?TOPIC_ID=1763
Please dont double post your queries.