ATtiny85 Tiny Light With Single WS2812B RGB LED

ATtiny85 (Digispark) is one of the smallest and cheapest Arduino board available in the market. In this project, we will connect a programmable RGB LED to the ATtiny board and program it to show rainbow colors. We will also create a 3D printed enclosure to make it wall/desk mountable.

Supplies

1) ATtiny85 (Digispark)

2) Addressable RGB LED (WS2812B)

3) Soldering iron and wires

Step 1: Install Libraries and Drivers

You need the following libraries/drivers for this project:

1) FastLED: https://github.com/FastLED/FastLED

Download the libraries as zip files and add them to your Arduino sketch as follow:

Sketch -> Include Library -> Add .zip library

2) Download and install USB drivers for the ATtiny from here:

https://github.com/digistump/DigistumpArduino/releases

[Digistump.Drivers.zip]

Step 2: Arduino Board Manager

By default, Arduino IDE does not support ATtiny85. Hence, we need to add the following link in the additional board manager URL:

http://digistump.com/package_digistump_index.json

Then, search and install “Digistump AVR Boards” from the Board Manager.

Then, go to Tools--> Board --> Digistump AVR Board --> Digispark (Default -16.5mhz)

Step 3: Connection

ATtiny85--> LED

5V --> 5V

GND --> GND

P1 --> Din

Step 4: Arduino Sketch

#include <FastLED.h>

#define LED_PIN 1

#define NUM_LEDS 1

CRGB leds[NUM_LEDS];

void setup()

{

 FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);

 FastLED.setMaxPowerInVoltsAndMilliamps(5, 500);

 FastLED.clear();

 FastLED.setBrightness(255);

 for (int i = 0; i < NUM_LEDS; i++ )

   leds[i] = CRGB::Black;

 FastLED.show();

}

void loop()

{

   uint8_t thisSpeed = 10;

   uint8_t deltaHue= 10;

   uint8_t thisHue = beat8(thisSpeed,255);

   fill_rainbow(leds, NUM_LEDS, thisHue, deltaHue);

   FastLED.show();

}

Step 5: 3D Printed Enclosure

Will be added soon