Traffic light on ATtiny13 microcontroller. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Traffic light on ATtiny13 microcontroller. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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I decided to make a traffic light for my little brother from improvised means.

At hand was MK ATtiny13, a few LEDs and resistors. This MK has a flash program memory of 1kb, but this is enough for us, despite the fact that the program is written in C in CodeVisionAVR.

Here is the source code of the program:

/***************************************************** ****
This program was produced by the
CodeWizardAVR V1.25.2 Beta1 Standard
Automatic Program Generator
© Copyright 1998-2006 Pavel Haiduc, HP InfoTech srl
hpinfotech.com

Project:
version:
Date: 27.07.2007
Author : Paul
Company : Home
Comments:

Chip type: ATtiny13
Clock frequency : 4,800000 MHz
Memory model: Tiny
External SRAM size: 0
Data Stack size: 16
******************************************************* ***/

#include
#include
unsigned char light=1;
unsigned char onf=0;
// Pin change interrupt service routine
interrupt [PCINT0] void pin_change_isr(void)
{
// Place your code here
if(PINB.4!=0)
{
if(svet<4)svet++;
else light=1;
onf=0;
}
if(PINB.3!=0)
{
onf=1;
// PORTB.1=1;PORTB.2=1; PORTB.0=1;
}
delay_ms(200);
}

// Declare your global variables here

void main (void)
{
// Declare your local variables here

// Crystal Oscillator division factor: 1
#pragma optsize-
CLKPR=0x80;
CLKPR=0x00;
#ifdef _OPTIMIZE_SIZE_
#pragmaoptsize+
#endif

// Input/Output Ports initialization
// Port B initialization
// Func5=In Func4=In Func3=In Func2=Out Func1=Out Func0=Out
// State5=T State4=T State3=T State2=0 State1=0 State0=0
PORTB=0x00;
DDRB=0x1F;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0A output: Disconnected
// OC0B output: Disconnected
TCCR0A=0x00;
TCCR0B=0x00;
TCNT0=0x00;
OCR0A=0x00;
OCR0B=0x00;

// External Interrupt(s) initialization
// INT0: Off
// Interrupt on any change on pins PCINT0-5: On
GIMSK=0x20;
MCUCR=0x00;
PCMSK=0x1F;
GIFR=0x20;

// Timer/Counter 0 Interrupt(s) initialization
TIMSK0=0x00;

// Analog Comparator initialization
// Analog Comparator: Off
ACSR=0x80;
ADCSRB=0x00;

// Global enable interrupts
#asm("sei")
//PORTB.0=1; //gr
//PORTB.1=1; //re
//PORTB.2=1; //ye
while (1)
{
if(onf==0)
{
switch (light)
{
case 1:PORTB.0=1; PORTB.1=0; PORTB.2=0; break;
case 2:PORTB.2=1; PORTB.0=0; PORTB.1=0; break;
case 3:PORTB.1=1; PORTB.0=0; PORTB.2=0; break;
case 4:PORTB.1=1;PORTB.2=1; PORTB.0=0; break;
}

}
if(onf==1)
{
if(svet<4)svet++;
else light=1;

switch (light)
{
case 1:PORTB.0=1; PORTB.1=0; PORTB.2=0; break;
case 2:PORTB.2=1; PORTB.0=0; PORTB.1=0; break;
case 3:PORTB.1=1; PORTB.0=0; PORTB.2=0; break;
case 4:PORTB.1=1;PORTB.2=1; PORTB.0=0; break;
}
delay_ms(1000);
}
};
}

Photos of the finished device:

Traffic light on ATtiny13 microcontroller. Photo of the finished device

Traffic light on ATtiny13 microcontroller. Traffic light in action

HEX firmware, LAY-file and device diagram you can download here (67 kb).

Watch a video of the traffic light

Author: BATCOH (iupfan sabaka mail period ru); Publication: cxem.net

See other articles Section Microcontrollers.

Read and write useful comments on this article.

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