Two Way Traffic Light AVR Demo

Well I got around to making my own 2-way street traffic light. Source code has no complicated math, just timed events that loop.

Here is a video. Below is a photo & the source code (copy & paste), and the resistor near bottom center of breadboard was left in by accident from LCD I had hooked up earlier (not needed in this layout). Also, I cheated and didn't use resistors for the LEDs (why they are so bright), this would be more of a battery drainer in a real world application. I removed the USB to serial RS232 that writes the hex files to the MCU (not an ISP), now the circuit looks so basic and is now a working prototype of a (microcontroller controlling at least 6 devices) toy traffic signal set (could be used by kids when playing cars, train collecting enthusiasts, etc).

Source code for 2way traffic signals AVR project:
/* www.nerdful.com - I get called a nerd, but I am only a bit nerdful... This code will do what a set of 2 traffic lights will do green, orange, and then red for each direction, but other direction does different actions. */ #include <avr/io.h> #include <avr/delay.h> void sleep(uint8_t millisec) { while(millisec) { delay_ms(1000); millisec--; } } main() { DDRC |=1<<PC5; //enable pin 28 red1 DDRC |=1<<PC4; //enable pin 27 yellow1 DDRC |=1<<PC3; //enable pin 26 green1 DDRB |=1<<PB3; //enable pin 17 red2 DDRB |=1<<PB2; //enable pin 16 yellow2 DDRB |=1<<PB1; //enable pin 15 green2 while(1) { PORTC &= ~(1<<PC5); //on red1 pin28 PORTB &= ~(1<<PB1); //on green2 pin 15 PORTB |=(1<<PB3); //off red2 PORTC |=(1<<PC4); //off yellow1 PORTB |=(1<<PB2); //off yellow2 PORTC |=(1<<PC3); //off green1 sleep(5); PORTB &= ~(1<<PB2); //on yellow2 PORTB |=(1<<PB1); //off green2 sleep(2); PORTC |=(1<<PC5); //off red1 PORTB |=(1<<PB2); //off yellow2 PORTC &= ~(1<<PC3); //on green1 PORTB &= ~(1<<PB3); //on red2 sleep(5); PORTC &= ~(1<<PC4); //on yellow1 PORTC |=(1<<PC3); //off green1 sleep(2); } } /* www.nerdful.com www.fototrix.com www.whak.com */

Another source code for a 6 LED light chaser effect (Cylon Fighter):
/* www.nerdful.com - I get called a nerd now and then, but I am only a bit nerdful... */ #include <avr/io.h> #include <avr/delay.h> void sleep(uint8_t millisec) { while(millisec) { delay_ms(1); millisec--; } } main() { DDRC |=1<<PC5; //enable pin 28 red1 DDRC |=1<<PC4; //enable pin 27 yellow1 DDRC |=1<<PC3; //enable pin 26 green1 DDRC |=1<<PC2; //enable pin 25 red2 DDRC |=1<<PC1; //enable pin 24 yellow2 DDRC |=1<<PC0; //enable pin 23 green2 while(1) { PORTC &= ~(1<<PC5); //on red1 pin28 PORTC |=(1<<PC0); //off green2 pin23 PORTC |=(1<<PC4); //off yellow1 pin27 PORTC |=(1<<PC3); //off green1 pin26 PORTC |=(1<<PC2); //off red2 pin32 PORTC |=(1<<PC1); //off yellow2 pin24 sleep(50); PORTC |=(1<<PC5); //off red1 pin28 PORTC &= ~(1<<PC4); //on yellow1 pin27 sleep(50); PORTC |=(1<<PC4); //off yellow1 pin27 PORTC &= ~(1<<PC3); //on green1 pin26 sleep(50); PORTC |=(1<<PC3); //off green1 pin26 PORTC &= ~(1<<PC2); //on red2 pin32 sleep(50); PORTC |=(1<<PC2); //off red2 pin32 PORTC &= ~(1<<PC1); //on yellow2 pin24 sleep(50); PORTC |=(1<<PC1); //off yellow2 pin24 PORTC &= ~(1<<PC0); //on green2 pin 23 sleep(50); PORTC |=(1<<PC0); //off green2 pin23 PORTC &= ~(1<<PC1); //on yellow2 pin24 sleep(50); PORTC |=(1<<PC1); //off yellow2 pin24 PORTC &= ~(1<<PC2); //on red2 pin32 sleep(50); PORTC |=(1<<PC2); //off red2 pin32 PORTC &= ~(1<<PC3); //on green1 pin26 sleep(50); PORTC |=(1<<PC3); //off green1 pin26 PORTC &= ~(1<<PC4); //on yellow1 pin27 sleep(50); } }

Well it's about 4am now, I better get some sleep. Another day, another learning experience.

Two Way Traffic Light AVR Demo

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