8 LED Beacon Kit w/ Microchip PIC + 4.5V Battery Pack

The Beacon

Schematic

Click image to zoom.

What is Included

Click SKU code in table below to locate particular part. Click images to zoom.

SKU	Image	Description	Qty
#2683 PCB-UNI7		CEM (Epoxy) Prototyping PCB 70 x 50mm w/ 432 Pads	1
#2529 CPU-BEACON8		Programmed Microcontroller for 8 LED Beacon Kit	1
#1604 ICS314		14 Contacts DIP 0.3” Socket	5
#1444 C5K10-50		100nF/50V Radial Ceramic Disc Capacitor	5
#2792 R2J47-8		470 Ohm 1/8W Carbon Film Resistor ±5%	40
#2557 LED3W		White ø 3mm Clear LED Extra Bright 8000mcd	16
#2554 LED3B		Blue ø 3mm Clear LED Extra Bright 5000~10000mcd	8
#2556 LED3R		Red ø 3mm Clear LED Extra Bright 4000mcd	8
#2555 LED3G		Green ø 3mm Clear LED Extra Bright 8000mcd	8
#1307 BHAAA3W		Plastic Battery Holder 3-cell AAA Wire Leads	1
#1352 RAY-MAXPLUS-AAA		Alkaline Battery AAA 1200mAh 1.5V MAXIMUM PLUS AAA	3
Total			96

How to power it-up

This project requires 3~5V. You can use batteries or power adapter from an appliance like charger, network router, phone answering machine, etc.

Other possibilities:

• Pack of 3 alkaline cells supplies approx. 4.5V fuly charged.
• Pack of 4 NiCD cells supplies approx. 5V fuly charged.
• 3.7V lithium cell (e.g. 18650 type) supplies approx. 4.2V fully charged.
• 3V lithium cell (e.g. 2032) will work but LEDs will be faint.

Do not use higher voltage than 5.5V or you may damage the chip !

Assembly Steps

• Cut the universal PCB into 8x8 pieces.
• Install DIP14 socket. You may place a two-wire cable under it to lock the cable and prevent tear.
• Install 8 resistors and leave their leads longer.
• Install wire loop around PCB, this will be GND (not shown).
• Install LEDs from the bottom. Bend cathodes and solder them onto GND loop.
• Bend the leads of resistors and make connections (blue in the picture).
• Install 100nF capacitor between VDD and VSS of U1.
• Install a jump from LED7 anode to R7.
• Install power leads.
• Insert programmed PIC.

Click images to zoom.

Source Code

;Beacon8 w/ PIC16F526
;dipmicro electronics, 2009

#include "P16F526.INC"

	__config _MCLRE_OFF & _IOSCFS_4MHz & _IntRC_OSC_RB4 & _CP_OFF & _WDTE_OFF

#define LED1 PORTC,0
#define LED2 PORTC,1
#define LED3 PORTC,2
#define LED4 PORTC,4
#define LED5 PORTC,5
#define LED6 PORTB,4
#define LED7 PORTC,3
#define LED8 PORTB,1
#define DELAY_VALUE 100

PAUSE macro
	movlw DELAY_VALUE
	call delay
	endm

	radix dec

	cblock 0x10				;variables
delayCount
	endc

	org 0

	goto start

;----------------------------------------------------------------------------
; delay
;----------------------------------------------------------------------------

delay:
	movwf delayCount
delay1:
	clrw
delay2:
	nop						;1c
	decfsz W,f	;1c
	goto delay2				;2c
	decfsz delayCount,f
	goto delay1
	retlw 0

;----------------------------------------------------------------------------
; main program
;----------------------------------------------------------------------------

start:
	banksel 0
	clrw
	movwf ADCON0
	movwf CM1CON0
	movwf CM2CON0
	movlw b'11001000'
	tris PORTB
	movlw b'11000000'
	tris PORTC
	movlw b'11011000'
	option

	bcf LED1
	bcf LED2
	bcf LED3
	bcf LED4
	bcf LED5
	bcf LED7

main:

	bsf LED8
	bcf LED6
	PAUSE

	bsf LED1
	bcf LED7
	PAUSE

	bsf LED2
	bcf LED8
	PAUSE

	bsf LED3
	bcf LED1
	PAUSE

	bsf LED4
	bcf LED2
	PAUSE

	bsf LED5
	bcf LED3
	PAUSE

	bsf LED6
	bcf LED4
	PAUSE

	bsf LED7
	bcf LED5
	PAUSE

	goto main

	end