Bionic Hipster Glasses - the code behind

If you want to make something special for this Halloween, this is your chance!
For a few lines of code,

Just copy-paste the code blow into an new Arduino sketch.

//          ____   _                _        ______                
//         / __ ) (_)____   ____   (_)_____ / ____/__  __ ___      
//        / __  |/ // __ \ / __ \ / // ___// __/  / / / // _ \     
//       / /_/ // // /_/ // / / // // /__ / /___ / /_/ //  __/     
//      /_____//_/ \____//_/ /_//_/ \___//_____/ \__, / \___/      
//                                              /____/             
//      
//              Created by Yair Kapach 2015
//        For build details and more, please visit: 
//         http://www.youtube.com/user/microstrat
//           http://makestuffordie.blogspot.com/
//
//    you're welcome to hack it, break it and have fun !
#include <Servo.h>
#include <SoftwareSerial.h>

#define SERVO_PIN 9
#define BT_RX_PIN 10
#define BT_TX_PIN 11

Servo eye;
SoftwareSerial bluetooth(BT_RX_PIN, BT_TX_PIN);

int pos = 60;  
int lastPos = pos;

void setup()
{
  bluetooth.begin(9600);                // initialize communication
  eye.attach(SERVO_PIN);                // initialize servo
  eye.write(pos);                       // look ahead :)
}

void loop()
{
  if (bluetooth.available()) {           // try and read if available
    int data = bluetooth.read();         // read a single character
    pos = map(data, '0', '9', 10, 110);  // convert digit to degrees
  }
  if (lastPos != pos) {                  // don't resend the same values
    lastPos = pos;
    eye.write(pos); 
  }
}

Download any Bluetooth terminal app, I preferred one with custom hotkeys, you can set buttons 0-9 to send any data once clicked.
Since our protocol is quite dumb, button 0 sends '0', 1 sends '1' and so on...

Happy Halloween.

Playing around with Peltier

A friend brought me a Peltier element (see Thermoelectric cooling) he had lying around.
I thought it would be cool (pun intended) to have a DIY beverage cooler on my desk.
All you need is: an aluminum heat-sink, a 12V fan and few LEDs.
My 9 years old kid soldered everything in parallel and of course burned his hand (please don't report to the social services, we only learn by making mistakes)

14 degrees Celsius is fine, but why not kicking it up a notch.

After replacing the linear power supply (500mA) with a PC power supply, we have 3 degrees less.

The next step would be finding a CPU fan + heat-sink and 3D printing an enclosure.

When Hipsters and Cyborgs meet

Just got back to an old project, a Halloween costume. It used to be a Bluetooth-controlled-pirate-eye, but it wasn't that comfortable to wear.
So I decided starting everything from scratch:

• Only few electronic components.
• Less than 50 lines of Arduino code.
• Fully 3D printed parts (no screws, nuts etc.)
• Printable on a 10cm^3 printer (~4'')

Soon available on Thingiverse...