This paper introduces a novel car taillight indicator. The indicator consists of a special LED array. There are eight groups, each group is illuminated by nine LEDs and placed on the rear glass window of the car. There are five display states. When there is a parking or braking signal, the eight groups of LEDs are all dots. When there is a back signal, the LEDs are flashing. When there is a danger signal, the eight groups of LEDs are divided into two groups. When the signal is turned right, the four groups of LEDs on the right side are illuminated from the middle to the right. When there is a left turn signal, the four groups of LEDs on the left side are illuminated from the middle to the left, and repeat when the turn signal does not disappear. Chic, giving people a new and pleasing feeling.
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The AT89C2051 chip used in this device is an MSC-51-compatible high-performance processor manufactured by Atmel with its own 2KB programmable flash memory. It has the same core and similar structure functions as the conventional 51 chip, such as RAM, timing/counter, interrupt structure, serial port, oscillator and clock circuit; there are oscillation frequencies up to 24MHz, and there are fewer Streamlined I/O ports, so they are small, making them ideal for small applications.
The assembler and detailed comments are as follows:
STOP BIT 32H; brake sign
DANGE BIT 33H; danger sign
BACK BIT 34H ; reversing sign
RIGHT BIT 35H; turn right sign
LEFT BIT 36H; left turn sign
FLASH BIT 37H; flashing logo
LRSET BIT 38H ;
COUNT EQU 32H ;
ORG 0000H
AJMP MAIN; jump main program
ORG 0030H
AJMP MAIN
MAIN: NOP
MOV R0, #20H ; 20H to 60H unit clear
MOV A, #0
RES: MOV @R0,A
INC R0
CJNE R0, #60H,RES
MOV SP, #60H ; set the stack pointer to 60H
MOV COUNT, #0 ; clear cycle counter
CLR TIME_OUT ; clear timing time to sign
CLR EA
CLR RIGHT; clear right turn sign
CLR STOP; clear brake sign
CLR DANGE; clear danger sign
CLR BACK; clear reverse sign
CLR LEFT; clear left turn sign
CLR LRSET; clear lights up in turn
LOP: ACALL DL1; call delay subroutine
ACALL DL1; call delay subroutine
CPL FLASH; flashing flag is reversed
JNB LRSET, LOP1; no lighting indicator in turn to LOP1
INC COUNT ; in turn up the counter plus 1
MOV A, COUNT
CJNE A, #5, LOP1
MOV COUNT, #0; count to 5 clear
LOP1: ACALL CL ; call process processing subroutine
LOPA: ACALL KEY; call button processing subroutine
AJMP LOP ; return to the main loop
DL1 : MOV R6, #200 ; Delay subroutine
DL11: MOV R5, #250
DJNZ R5, $
DJNZ R6, DL11
RET
CL: NOP; process processing subroutine
JNB STOP, CL1
MOV A, #0FFH; parking or brake sign
CPL A ; display is fully illuminated
MOV P1, A
AJMP CLE
CL1: JNB DANGE, CL2
JB FLASH, CL11; dangerous sign
MOV A, #0FH ; the left and right sets of monitors flash alternately
MOV P1, A
AJMP CLE
CL11: MOV A, #0F0H
MOV P1, A
AJMP CLE
CL2: JNB BACK, CL3
JB FLASH, CL21; with reverse sign
MOV A, #0FFH; display is full or full
MOV P1, A; display is fully illuminated
AJMP CLE
CL21: MOV A, #00H
MOV P1, A; display is completely off
AJMP CLE
CL3: JNB RIGHT, CL4
MOV DPTR, #RIGHT_CHAR; have a right turn sign
MOV A, COUNT; the right four groups of light-emitting arrays are sequentially cycled
MOVC A, @A+DPTR ; take display value
CPL A
MOV P1, A
AJMP CLE
CL4: JNB LEFT, CL5
MOV DPTR, #LEFT_CHAR; has a left turn sign
MOV A, COUNT; the four groups of light-emitting arrays on the left are sequentially cycled
MOVC A, @A+DPTR ; take display value
CPL A
MOV P1, A
AJMP CLE
CL5: MOV A, #0 ; if there is no mark, turn off the display
CPL A
MOV P1, A
CLE: RET
KEY: NOP ; button processing subroutine
CLR STOP ; Clear stop flag
CLR DANGE ; Clear hazard sign
CLR BACK ; Clear backing sign
CLR RIGHT ; Clear right turn sign
CLR LEFT ; Clear left turn sign
JNB P3.2, KEY1
SETB STOP ; P3.2 has a key press, set the stop sign
AJMP KEYE
KEY1: JNB P3.3, KEY11
SETB DANGE ; P3.3 has a key press, set the danger sign
KEY11: MOV A, P3
CJNE A, #22H, KEY2
SETB DANGE ; P3.5 P3.1 Press simultaneously to set the danger sign
AJMP KEYE
KEY2: JNB P3.4, KEY3
SETB BACK; P3.4 has a key press, put the reverse sign
AJMP KEYE
KEY3: JNB P3.5, KEY4
SETB RIGHT ; P3.5 has a key press, set the right turn flag
JB LRSET, KEYE
SETB LRSET ; set left and right cycle display flag
MOV COUNT, #0 ; loop display counter clear
AJMP KEYE
KEY4: JNB P3.1, KEY5
SETB LEFT; P3.1 has a key press, set the left turn flag
JB LRSET, KEYE
SETB LRSET ; set left and right cycle display flag
MOV COUNT, #0 ; loop display counter clear
AJMP KEYE
KEY5: CLR LRSET; clear left and right cycle display flag
KEYE: RET
LEFT_CHAR: DB 00H, 10H, 30H, 70H, 0F0H; light values ​​from right to left
RIGHT_CHAR: DB 00H, 08H, 0CH, 0EH, 0FH; light values ​​from left to right
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