### DESCRIPTION

A very cute reindeer Christmas ornament. You can hang it on the Christmas tree or anywhere you like

It`s very simple to make and requiers few components!

### TECHNICAL DETAILS / COMPONENTS

Here are some links to where you can buy what you need to build this project.

8mm Red led:

https://www.aliexpress.com/item/20PCS-F-F88MM-8MM-LED-SUPER-BRIGHT-RED-RED-Lamp-DIP-2-LONGLEG-Light-Emitting-Diode/32631172545.html

Attiny85 SO8:

https://www.aliexpress.com/item/ATTINY85-20SU-SOP8-ATTINY85-20-SOP-ATTINY85-SMD-85-20SU-5piece-lot-new-and-original/32793517408.html

SMD Switch:

https://www.aliexpress.com/item/10pcs-MSK-12C01-MSK12C01-7-pin-toggle-switch-for-1P2T-MSK-12C01-07/32815080408.html

1206 160ohm Resistor:

https://www.aliexpress.com/item/Free-Shipping-100PCS-1206-160R-1206-160ohm-1-SMD-Resistor-160ohm/2043972079.html

1206 100nF Capacitor:

https://www.aliexpress.com/item/Free-shipping-1206-SMD-capacitor-100nf-50V-104K-100PCS/32372347475.html

CR2032 Battery Holder:

https://www.aliexpress.com/item/CR2032-2032-Battery-Button-Cell-Holder-Socket-Case-Battery-Holder-TBS-2032-X/32688502154.html

Mini USB SMD Connector for programming (OPTIONAL):

https://www.aliexpress.com/item/Free-shipping-USB-socket-MINI-USB-5P-female-SMD-connector-Mini-USB-Interface-5Pin/32811399149.html

### LEARN / TOPIC / BUILD INSTRUCTIONS

After you solder all the components together, you need to program the attiny85 to light up Rudolph`s nose.

Here is some code to help you with that. You can modify it as you please

(To program the attiny I used my ICSP cable, wich uses a mini USB connector, but you can program it through other means

https://www.instructables.com/id/Arduino-ICSP-Cable/ )

/*

Ultra Low Power Led Flasher

with AtTiny85 @ 1Mhz

by Luca Soltoggio

06/01/2014

http://www.arduinoelettronica.com

*/

#include <avr/sleep.h>

#include <avr/wdt.h>

#ifndef cbi

#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))

#endif

#ifndef sbi

#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))

#endif

int pinLed = 0;

volatile boolean f_wdt = 1;

void setup(){

pinMode(pinLed,OUTPUT);

setup_watchdog(7);    // 0=16ms, 1=32ms,2=64ms,3=128ms,4=250ms,5=500ms

                                   // 6=1 sec,7=2 sec, 8=4 sec, 9= 8sec

}

void loop(){

if (f_wdt==1) {  // wait for timed out watchdog / flag is set when a watchdog timeout occurs

f_wdt=0;       // reset flag

digitalWrite(pinLed,HIGH);  // let led blink

delay(100);

digitalWrite(pinLed,LOW);

pinMode(pinLed,INPUT); // set all used port to intput to save power

system_sleep();

pinMode(pinLed,OUTPUT); // set all ports into state before sleep

}

}

// set system into the sleep state

// system wakes up when wtchdog is timed out

void system_sleep() {

cbi(ADCSRA,ADEN);                    // switch Analog to Digitalconverter OFF

set_sleep_mode(SLEEP_MODE_PWR_DOWN); // sleep mode is set here

sleep_enable();

sleep_mode();                        // System sleeps here

sleep_disable();                     // System continues execution here when watchdog timed out

sbi(ADCSRA,ADEN);                    // switch Analog to Digitalconverter ON

}

void setup_watchdog(int ii) {

byte bb;

int ww;

if (ii > 9 ) ii=9;

bb=ii & 7;

if (ii > 7) bb|= (1<<5);

bb|= (1<<WDCE);

ww=bb;

MCUSR &= ~(1<<WDRF);

// start timed sequence

WDTCR |= (1<<WDCE) | (1<<WDE);

// set new watchdog timeout value

WDTCR = bb;

WDTCR |= _BV(WDIE);

}

// Watchdog Interrupt Service / is executed when watchdog timed out

ISR(WDT_vect) {

f_wdt=1;  // set global flag

}