Tag:

avr

Projects

Cornell University Feb 2013 AVR projects

These are great projects from Cornell University ECE 4760 Designing with Microcontrollers Final Projects

They have a lot of information – schematics, code and information. They are well worth a look

AVR architecture projects using WINAVR/GCC

Feb 2013 projects

Projects

Cornell University Feb 2014 AVR projects

These are great projects from Cornell University ECE 4760 Designing with Microcontrollers Final Projects

They have a lot of information – schematics, code and information. They are well worth a look

AVR architecture projects using WINAVR/GCC

Feb 2014 projects

Realtime Video Spectrograph (video, birdsong, dialup modem)
Circuit Plotter (video)
Skittle Sorter (video)
SingLock (video)
AVR 16-bit, stereo, WAV player (video)
Touchscreen directed robot (video)
Doppler Radar for Collision Avoidance (video)
MIDI glove (video)
Speech Lock (video)
Drums anywhere (video)
Body fat from Impedance (video)
Two player Tetris (video)
CPR training dummy (video)
Color TV game (video)
DCT Frequency Visualizer (video)
Optical Music Reader/player (video)
Ukule-LED (video)
Drum Set (video)
Bike Dash (video)
Music Lockbox (video)
Virtual Bowling video game (video) flex sensor supplier — imagesco.com,
Smart Sitter: Wireless Home Automation System (video)
Realtime Pitch shifter
Virtual Virtuoso for conductors (video)
Distance sensor Space Invaders (video)
Lab Gloves (video)
Sound-localizing Camera (video)
Selfie-bot (video)
Chiptune heart rate (video)
GPS Navigator/Explorer (video)
Ultrasonic Pursuit Automobile (video)
Boxing Training (video)
Virtual Object Grabber (video)
Piano Sight reading assistant (video)
LED Sketchpad (video)
Map-learning, line-following robot (video)
Smart Medicine Box (video)
Bluetooth robot (video)
Balancing robot
Sign Language glove (video)
Electro_ocular cursor control (video)
Security System

Code

AVR external interrupt example

An AVR external interrupt example

#include<avr/io.h>
#include<avr/interrupt.h> // interrupt header file
#include<util/delay.h>

/**
	External Interrupt Program
*/
// Interrupt service Routine for INTO
ISR(INT0_vect) 
{
		
	//_delay_ms(50); // Software Debounce delay
	PORTB ^= 1<<PINB0;
	_delay_ms(50);
	
	
}

int main (void)
{
	DDRB |= 1<< PINB0 | 1<< PINB2; // setn PINB0 and PINB1 as output
	PORTB &= ~(1<< PINB0 | 1<< PINB2);
	
	DDRD &= ~(1<<PIND2); // PIND2 set as input.. This is the INT0 pin to which button is connected
	PORTD |= 1 << PIND2; // push PIND2 to high - internal pull up resisitor- short when button is pressed
	
	GIMSK = 1<<INT0;			// enable interrupt on INTO pinD2
	MCUCR = 1<<ISC01 | 1 << ISC00; // Trigger INTO on rising edge
	
	
	// enable global interrupts
	sei();	
	
	while(1)
	{
		
		PORTB ^= 1 << PINB2;
		_delay_ms(50);
		
	}
}

Code

OPenM128 development board button and LED example

Another example for the OpenM128 AVR development board here, we will look at the onboard buttons and LEDs again.

As stated in a previous article the development board has 8 LEDS and also 4 buttons available, in this example we will flash different sequences on the LEDs. Here are the pinouts of the LEDs and buttons from the schematic

These are the LEDs and as I stated you can see that these connect to PortA

Now for the 4 buttons, in this case you can see the buttons are connected to PD6, PD7, PE6 and PE7

Parts List

The programmer is a bit more expensive but it works seamlessly with Atmel Studio

Name	Link
OpenM128 Development Evaluation Board	ATmega128 AVR Development Evaluation Board Kit = OpenM128 Standard
AVRISP MKII	AT AVRISP mkII AVR ISP MK2 ISP2 downloader

Atmel Studio code

In this example the 4 buttons will set different values to PortA as you can see below

[codesyntax lang=”cpp”]

#include <avr/io.h>
#include <util/delay.h>


void key_press(void)
{
	PIND &=0xC0;
	switch((PIND&0xC0))
	{
		case 0x80:  while((PIND&0xC0)==0x40);PORTA =0xAA;break;
		case 0x40:  while((PIND&0xC0)==0x80);PORTA =0x55;break;
	}

	PINE &=0xC0;
	switch((PINE&0xC0))
	{
		case 0x80:  while((PINE&0xC0)==0x40);PORTA =0x00;break;
		case 0x40:  while((PINE&0xC0)==0x80);PORTA =0xFF;break;
	}

}
int main(void)
{

	DDRD =0X00;
	DDRE =0X00;
	PORTD = 0xff;
	PORTE = 0xff;
	DDRA = 0xff;
	PORTA = 0x55;
	while(1)
	{
		key_press();
	}

}

[/codesyntax]

Programming

This time I used AtmelStudio and the USB AVRISP XPII and it worked perfectly