Revision as of 10:24, 15 November 2014

DIY Kit contains
Component Placement

The colorful Persistence Of Vision (POV) kit enables you to create colorful messages in air with just 8 LEDs. This kit is great introduction to soldering and AVR/Arduino Programming. The kit does not require a external programmer, it is self programmable with USB.

Solder it!

Image above shows the layout of various components for the board. It is also printed on the PCB.

Component Layout

The image shows reference numbers for all the components.

From the table below find out the exact part for the reference number.

Component List

ref	value	Item count
C1	4.7uF	1
C2	100nF	1
C3,C4	22pF	2
CON1	AVR-ISP-10	1
D1,D2	3.6V Zener	2
IC1	ATMEGA8-P	1
J1	USB_2	1
LED1..LED8	LED-RGB	8
P8	Batt	1
Q1..Q3	BC547	3
R1	2.2K	1
R2,R3	68E	2
R4	10K	1
R5..R12	22	8
R13..R15	1K	3
SW1	Boot	1
SW2	Reset	1
X1	12MHz	1

Programming

C Code

#include <avr/io.h>
#include<util/delay.h>
#include<stdint.h>
#include<avr/interrupt.h>
 
#define Blue 3
#define Green 4
#define Red 5
 
uint8_t i=0;  
 
 
const static uint16_t image[]= 
{
{
0b0000100011111111, 0b0000100011111111, 0b0000100011111111, 0b0000100011111111,
0b0000100011111111, 0b0000100011111111, 0b0000100011111111, 0b0000000000000000,
0b0000010011111110, 0b0000010000010001, 0b0000010000010001, 0b0000010000010001,
0b0000010011100001, 0b0000000000000000, 0b0000010001111110, 0b0000010010010001, 
0b0000010010010001, 0b0000010010010001, 0b0000010000001110, 0b0000000000000000, 
0b0000001011111111, 0b0000001000010001, 0b0000001000010001, 0b0000001000010001, 
0b0000001000001110, 0b0000000000000000, 0b0000001000001110, 0b0000001000010001, 
0b0000001000010001, 0b0000001011111111, 0b0000000000000000, 0b0000000000000000,
0b0000100001110000, 0b0000100011111100, 0b0000100011111110, 0b0000100011111111,
0b0000100011111111, 0b0000100011111110, 0b0000100011111100, 0b0000100001111000, 
0b0000000000000000, 0b0000000000000000, 0b0000010011111110, 0b0000010000010001, 
0b0000010000010001, 0b0000010000010001, 0b0000010011100001, 0b0000000000000000,
0b0000001001110000, 0b0000001010001000, 0b0000001010001000, 0b0000001010001000,
0b0000001011111111, 0b0000000000000000, 0b0000001001110000, 0b0000001010001000, 
0b0000001010001000, 0b0000001010001000, 0b0000001011111111, 0b0000000000000000,
0b0000010001111110, 0b0000010010010001, 0b0000010010010001, 0b0000010010010001,
0b0000010010001111, 0b0000000000000000, 0b0000000000000000, 0b0000010011111111, 
0b0000010000010000, 0b0000010000010000, 0b0000010000010000, 0b0000010011111111 
};
 
void disp(uint16_t);
 
ISR (TIMER1_OVF_vect)    // Timer1 ISR
{
	disp(image[i]);
	i++;
 
	if(i==72)
	i=0;
 
	TCNT1H=0xFF;    // Reload the 16-bit count value
	TCNT1L=0xF0;    // in timer1 count registers
}
 
 
int main(void)
{	
    DDRC = 0b11111111;
	DDRD = 0b11111111;
 
	PORTC = 0b11111111;
	PORTD = 0b00000111;
 
	TCNT1H=0xFF;   // Load the 16-bit count value
	TCNT1L=0xF0;   // for 1 sec at 7.3728MHz
 
	TCCR1A=0x00;
	TCCR1B=0x05;  // Timer mode with 1024 prescAler
	TIMSK=0x04;   // Enable timer1 overflow interrupt(TOIE1)
	sei();        // Enable global interrupts by setting global interrupt enable bit in SREG
 
    while(1)
    {
 
    }
}
 
void disp(uint16_t pat)
{
 
	PORTC = pat & 0x3f;
	PORTD = (pat>>6)& 0xff;
}

Arduino Code

Arduino Code will be uploaded soon.

Pattern Generation

To create an image/patterm, you can use the POV image maker application.

Uploading the Pattern

Install USBasp driver on your computer. Note that the it will show up as not recognized if the reset sequence is not followed

Reset Sequence for uploading new pattern/image

POV Reset Sequence for uploading new image

Perform reset sequence every time you connect the kit to the computer.
To upload a new image, hold down the RESET button, press and release the BOOT button and then release the RESET button as shown below.
Note the LEDS will stop blinking once the kit is detected by the computer.

Downloads

Schematic

Difference between revisions of "Explore POV"