Things used in this project

Hardware components:
TinyCircuits TinyLily Mini Processor
CR2032 coin cell battery holder
Haptic motor
Switch (generic)

Custom parts and enclosures

Shell enclosure – in progress
This one fits the electronics, but is too tall/wide. Also, need to figure out a way to keep it closed. I want to cast it in metal, which will require insulation but should provide enough weight to close the shell.


  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the Uno and
  Leonardo, it is attached to digital pin 13. If you're unsure what
  pin the on-board LED is connected to on your Arduino model, check
  the documentation at

  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  pinMode(13, OUTPUT);

// the loop function runs over and over again forever
void loop() {
  digitalWrite(3, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(250);              // wait for .25 seconds
  digitalWrite(3, LOW);    // turn the LED off by making the voltage LOW
  delay(300000);              // wait for 5 minutes


Photo on 7 5 17 at 5 06 pm 7 05huowsyxv
Alex Glow
65 projects • 558 followers
The Hackster team's resident Hardware Nerd. I like robots, music, EEG, wearables, and languages. FIRST Robotics kid.


Did you replicate this project? Share it!

I made one

Love this project? Think it could be improved? Tell us what you think!

Give feedback


Add projectSign up / Login