Description of Running Lights
Circuit is very
simple and straightforward. Two inputs are added just to give an idea of input
control and software denouncing. An ATMEL
Micro-controller AT89C2051 is used to control the LED glowing one by one to give
the effect of running light.
Port 1 is used for LED. And Port 3 two pins P3.0 and
P3.1 are used as inputs pins to select
two different speed of the running lights.
A 12 M Hz
crystal is used for basic timings of controller. Micro-controller VCC pin has
grounded by one 0.1 uF capacitor, it should always to be grounded very near to
micro-controller VCC pin to protect by and RFI (Radio Frequency interference).
Schematic Circuit Diagram of the Project
Power Supply
Software
It is written in
BASCOM-51 A Holland company offering a
Power basic compiler
IDE, Many features at one tool.
Rem Project Running Light
Rem Date 27-10-2005
Rem This module is presented only to serve as an
sample for the
Rem AT89C2051 development. Author provides this
module as is and
Rem does'nt guarantee its functionality or
suitability for any
Rem particuler purpose
Rem Pl.E-Mail any question and suggestion to
syedpervez@yahoo.com
$regfile = "89c2051.dat"
$crystal = 12000000
Dim
Num_1 As Byte
Dim
Speed As Integer
Num_1 =
&B11111110
Speed =
1000
Do
Debounce
P3.0 , 0 , Slow , Sub
Debounce P3.1 , 0 , Fast , Sub
P1 =
Num_1
Waitms
Speed
Rotate
Num_1 , Left , 1
Loop
Slow:
Speed =
Speed + 100
If Speed
< 2000 Then
Speed =
2000
End If
Return
Fast:
Speed =
Speed - 100
If Speed
> 100 Then
Speed =
100
End If
Return
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