This is the traffic light program I wrote a few days ago, which is realized on 51 single chip microcomputer. The basic timing of the traffic light conversion is achieved, according to the time to change the traffic light conversion. Can download down to see the circuit diagram and the original program, the code to download it. I don’t put them all on.
The simulation schematic diagram is as follows:
MCU source program:
#include
sbit beiR=P1^0;
sbit beiY=P1^1;
sbit beiG=P1^2;
sbit nanR=P1^3;
sbit nanY=P1^4;
sbit nanG=P1^5;
uint a，b，c，type，j，i;
Void delay (uint x) / / delay
{
uchar i;
while（x–）for（i=0;i《120;i++）;
}
void delay_ MS (uint q) / / delay
{
uint i，j;
for（i=q;i》0;i–）
for（j=141;j》0;j–）;
}
Void shumaguan (uint K) / / nixie tube display
{
b=k/10;
c=k%10;
P3=11111101;
P2=smg_ DW; / / segment code
delay_ MS (20); / / delay 5ms
P3=11111110;
P2=smg_ DW [C]; / / segment selection code
delay_ MS (20); / / delay 5ms
}
main（）
{
Tmod = 0x01; / / set timer T0 to work mode 1
TH0=（65536-50000）/256;
TL0=（65536-50000）%256;
Tr0 = 1; / / start t0 counting
ET0 = 1; / / t0 interrupt allowed
Ex0 = 1; / / allow external interrupt 0 interrupt
EA = 1; / / interrupt
It0 = 1; / / external interrupt 0 is allowed as edge trigger mode
A = 10; / / countdown 10s
type=1;
while（1）{
switch（type）
{
Case 1: East West green light and South North red light
beiR=0;beiY=1;beiG=1;
nanR=1;nanY=1;nanG=0;
shumaguan（a）;
break;
Case 2: the yellow light flashes in the east-west direction and the green light turns off
if（a%2！ =0）
{
beiR=1;beiY=0;beiG=1;
}
if（a%2==0）
{
beiR=1;beiY=1;beiG=1;
}
shumaguan（a）;
break;
The red light is east-west, and the green light is north-south
beiR=1;beiY=1;beiG=0;
nanR=0;nanY=1;nanG=1;
shumaguan（a）;
break;
Case 4: / / the North-South yellow light flashes three times
if（a%2！ =0）
{
nanR=1;nanY=0;nanG=1;
}
if（a%2==0）
{
nanR=1;nanY=1;nanG=1;
}
shumaguan（a）;
break;
}
}
}