Marius M

ROMANIA • + Follow

Alexis Gimeno

SPAIN
- 5
- 2
Максим Maxbolt

BELARUS
- 8
- 0
Néstor

SPAIN
- 0
- 0
3

WhatsApp Image 2023-12-02 at 16.45.31_17408963.jpg

Description

PCB Christmas Tree 2023

A small PCB Christmas tree, using ATtiny85 / ATtiny13A and TTP223 touch sensor.

There are 11 LEDs controlled by four ATtiny pins, plus a TTP223 touch sensor linked to another ATtiny pin, which act as a switch that toggle between different lightning patterns (including an OFF "pattern").

I designed the PCB in order to be able to use both SMD and classic 3mm LEDs.

Please be aware when you order the PCBs.

The zip file I uploaded here (Gerber_PCB_v1.05-STAR_A+B.zip) contains the two .zip files ( A and B parts) of the actual Gerber files. You have to extract the initial Gerber_PCB_v1.05-STAR_A+B.zip file and then upload the Gerber files.

I did this so you can order the A and B parts individually (each part with its own Gerber file). This way you won't be charged extra for "multiple design in the same file".

The PCB is designed for a thickness of 1.2mm. Don't forget to select 1,2mm PCB thickness when placing the orders.

If you want to use SMD LEDs you need to order the PCB with a 1.2mm thickness , otherwise you won't be able to solder the SMD LEDs.

If you plan to use regular 3mm LEDs and for any reason you want a 1.6 mm thick PCB, you have to adjust the width of those middle cuts (where PCBs interconnect with each other and make them 1.6mm as well).

For a complete assembly guide please check out this instructable : https://www.instructables.com/PCB-Christmas-Tree/

You can find the software sketch there as well.

Have fun 😊!

P.S.: I plan to make a version with CR2032 battery as well, so stay tunned.

Code

PCB Christmas Tree Sketch

C/C++

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <avr/wdt.h>


// Define pins for switch the LED, plus the chosen interrupt for reacting to


#define INTERRUPT_PIN PCINT2  // This is PB2 per the schematic
#define DATADIRECTIONPIN DDB2 //page 64 data sheet
#define INT_PIN PB2           // Interrupt pin of choice: PB1 (same as PCINT2) - Pin 7


#define LED_PIN1 PB0           // PB0 - Pin 5
#define LED_PIN2 PB1           // PB1 - Pin 6
#define LED_PIN3 PB3           // PB3 - Pin 2
#define LED_PIN4 PB4           // PB4 - Pin 3


/*
 * Alias for the ISR: "PCINT_VECTOR" (Note: There is only one PCINT ISR. 
 * PCINT0 in the name for the ISR was confusing to me at first, 
 * hence the Alias, but it's how the datasheet refers to it)
 */
#define PCINT_VECTOR PCINT0_vect     


volatile uint8_t pushCount = 0; // variables used within ISR must be declared Volatile.


void setup() {
    cli();                    // Disable interrupts during setup

    DDRB = (1 << LED_PIN1) | (1 << LED_PIN2) 
         | (1 << LED_PIN3) | (1 << LED_PIN4); //replaces pinMode(LED_PIN1, OUTPUT);


    //configuring and enabling the interrupt 

    PCMSK |= (1 << INTERRUPT_PIN);    // Enable interrupt handler (ISR) for our chosen interrupt pin (PCINT1/PB1/pin 6)


    GIMSK |= (1 << PCIE);             // Enable PCINT interrupt in the general interrupt mask


    DDRB &= ~(0 << DATADIRECTIONPIN);  //replaces pinMode(INT_PIN, INPUT);

    PORTB |= (1<< INT_PIN); //disable pull-up. Must hook up pulldown resistor [ 1K ].


    sei();                            // enable interrupts after setup


}


void loop() {


  switch(pushCount){
    case 0 :
    pattern1();
    break;
    case 1 :
    pattern2();
    break;
    case 2 :
    pattern3();
    break;
    case 3 :
    pattern4();
    break;
    default:
    pattern1();
  }


}


// This is the interrupt handler called when there is any change on the INT_PIN
// ISR is defined in the headers - the ATtiny85 only has one handler
ISR(PCINT_VECTOR)
{
    if((PINB >> PINB2)&1!=0) {  // or if ( (PINB & PINB2) != 0 ) or (PINB >> PINB2)&1
      if(pushCount > 3) {
        pushCount = 0;
      }else{
        pushCount ++;
      }   
  }
  delay(50); //small debounce
}


void pattern1(){
  PORTB |= (1 << LED_PIN2) | (1 << LED_PIN4); //replaces digitalWrite(LED_PINx,HIGH);
  delay(150);
  PORTB &= ~((1 << LED_PIN2) | (1 << LED_PIN4)); //replaces digitalWrite(LED_PINx,LOW);
  delay(150);
  PORTB |= (1 << LED_PIN1) | (1 << LED_PIN3); 
  delay(150);
  PORTB &= ~((1 << LED_PIN1) | (1 << LED_PIN3));
  delay(150);
}


void pattern2(){
  PORTB |= (1 << LED_PIN1);
  delay(200);
  PORTB &= ~(1 << LED_PIN1);
  PORTB |= (1 << LED_PIN3);
  delay(200);
  PORTB &= ~(1 << LED_PIN3);
  PORTB |= (1 << LED_PIN2);
  delay(200);
  PORTB &= ~(1 << LED_PIN2);
  PORTB |= (1 << LED_PIN4);
  delay(200);
  PORTB &= ~(1<< LED_PIN4);

}


void pattern3(){
  PORTB |= (1 << LED_PIN2) | (1 << LED_PIN4);
  delay(80);
  PORTB &= ~((1 << LED_PIN2) | (1 << LED_PIN4));
  delay(80);
  PORTB |= (1 << LED_PIN2) | (1 << LED_PIN4);
  delay(80);
  PORTB &= ~((1 << LED_PIN2) | (1 << LED_PIN4));
  delay(80);
  PORTB |= (1 << LED_PIN1) |  (1 << LED_PIN3);
  delay(80);
  PORTB &= ~((1 << LED_PIN1) | (1 << LED_PIN3));
  delay(80);
  PORTB |= (1 << LED_PIN1) |  (1 << LED_PIN3);
  delay(80);
  PORTB &= ~((1 << LED_PIN1) | (1 << LED_PIN3));
  delay(80);
}


void pattern4(){  // POWER OFF
  PORTB &= ~((1 << LED_PIN1) | (1 << LED_PIN2) | (1 << LED_PIN3) | (1 << LED_PIN4)); //LEDs off
  power_off();
}


void power_off()
{
    cli();                               // Disable interrupts before next commands
    wdt_disable();                       // Disable watch dog timer to save power
    set_sleep_mode(SLEEP_MODE_PWR_DOWN); // Set sleep mode power down
    sleep_enable();
    sleep_bod_disable(); // Disable brown-out detector
    sei();               // Enable interrupts
    sleep_cpu();
    sleep_disable();
}

Download Gerbers Download BOM(Bill of materials)

Dec 02,2023

1,332 views

PCB Christmas Tree 2023

PCB Christmas tree, using ATtiny85 / ATtiny13A and TTP223 capacitive sensor

1332

9.00 (1)

Published: Dec 02,2023

Download Gerber file 19

BOM(Bill of materials)

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File Last Updated: 2023/12/03 (GMT+8)

File update record

2023-12-0304:04:17

Gerber file is updated.

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