Instructables

IsoLocker - cooling lock & storage box facade element

Picture of IsoLocker - cooling lock & storage box facade element
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Have you ever been in the situation that you need to store something, somewhere and keep that thing safe from strangers? And have you tried to store food or drinks in summer time, only to notice that all these things get annoyingly warm after some time and you cannot enjoy your fresh cold beverage or snack anymore?

Because of these situations the concept of the IsoLocker came up.

The IsoLocker not only features a safe storage, which access is secure and managable via logins. It also lets you cool the content to a degree you can set from anywhere via web.

It is highly recommended to use the attached blender file with the free software Blender while constructing the IsoLocker because it helps to understand the concepts and it allows you to look at it in 3D.

This project was part of Multimodal Media Madness 2014, hosted by the chair for Computer Aided Architectural Design (CAAD) and the Media Computing Group of RWTH Aachen University. For more Thinking Skins, please check this page: http://hci.rwth-aachen.de/m3_ss14

 
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Step 1: Materials & Machines

Picture of Materials & Machines
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This project requires two different sets of materials. One is the "raw material", which is basically the stuff for the wooden frame with all it's interior. This will hold all parts of the electronics set.

Different machines will be used while building the IsoLocker. There is a list of needed machines below.


Here you can find a list of amounts and properties for all needed materials. All dimensions are measured in cm. The first value describes the thickness / height of the material.


Raw stuff:


  • Solid wood
    Outer frame, Left and right sides (pictures 1, 2):
    • 2*: 1.7 x 28.1 x 56.1

    Outer frame, Bottom and top sides (pictures 1, 2):
    • 2*: 1.7 x 28.1 x 52.7

  • Chipboard
    Side cover parts (picture 3):
    • 2*: 1.6 x 19.1 x 14.55
    • 2*: 1.6 x 4.0 x 38.15
    • 2*: 1.6 x 4.0 x 48.2
    • 2*: 1.6 x 4.5 x 44.7
    • 2*: 1.6 x 4.5 x 33.6

    Inner framework (picture 4):
    • 1*: 1.6 x 3.0 x 14.55
    • 2*: 1.6 x 24.9 x 15.0
    • 6*: 1.6 x 24.9 x 4.5
    • 1*: 1.6 x 24.9 x 42.15
    • 1*: 1.6 x 24.9 x 41.5
    • 1*: 1.6 x 24.9 x 46.6
    • 1*: 1.6 x 24.9 x 32.0
    • 1*: 1.6 x 24.9 x 14.55
    • 1*: 1.6 x 24.9 x 15.1

    Inner door parts (picture 5):
    • 2*: 1.6 x 2.4 x 25.6
    • 2*: 1.6 x 2.4 x 12.45
    • 2*: 1.6 x 2.4 x 12.7
    • 2*: 1.6 x 2.4 x 32.05
    • 2*: 1.6 x 2.4 x 41.1
    • 2*: 1.6 x 5.0 x 37.7
    • 2*: 1.6 x 10.0 x 11.0

  • Fiberboard (MDF)
    Picture 6 contains all detailed information. Fiberboard is used to build the door parts. Since the doors have a special shape, you need to cut these to fit that shape.
    • 4*: 0.5 x 43.1 x 43.1

  • Cardboard, hard (as used in model making)
    Will be laser cuttered in later steps.
    • 1*: 0.3 x 55.0 x 15.0

  • Acrylic glass
    Will be laser cuttered in later steps.
    • 1*: 0.3 x 45.0 x 7.0

  • Aluminium board
    • 1*: 0.06 x 10.0 x 10.0
    • 1*: 0.06 x 10.0 x 30.75

  • Rock wool insulation
    You will need about 0.02 m³ of rock wool insulation.

  • 4* Concealed hinges
    35 mm diameter

  • Some flat head screws, 1.5 cm, diameter 4.0 mm

  • Some female screws, diameter 4.0 mm, counterparts to flat heat screws

  • Some wood screws, 1.5 cm, diameter 3.5 mm

  • Many wood screws, 3.0 cm, diameter 3.5 mm

  • Some nails, 1.5 cm

  • 8* Plastic spacers for screws, length 1.0 cm

  • Plastic or rubber washers for screws

  • Massive metal plate
    • 2*: 0.16 x 1.87 x 5.9

  • Heat sink, aluminium
    • 4*: 2.5 x 5.0 x 5.0

  • Heat conductive glue
    You will need around 7g of glue. Often they are sold as two-component adhesive, for example two syringes of 3.5g.

  • Glue / Hot glue

  • Wood glue

  • Fly screen
    • 4*: 6.0 x 6.0

  • Sealing strip
    • 1*: 0.2 x 0.8 x 335

Electronics:


A Raspberry Pi can be used to control all sensors, actuators and to setup a webserver. Door switches allow to check the current door status, temperature sensors are used to measure and give a feedback about the temperature inside. In case of bad light or nighttime light sensors are necessary to turn on the LEDs. Futhermore RGB LEDs indicate the current status of the IsoLocker and can be used to identify the correct IsoLocker if there are multiple of them next to each other. A buzzer sets off an alarm if one of the doors stays open for too long while the cooling is active.

For the door mechanics solenoids and servo motors are used. The cooling is provided by peltier elements. Aside from that there are also two NFC tags and QR codes for easy accessing the website with your smart-phone on each side of the IsoLocker. Some additional fans are needed for heat dissipation.

Finally to close the electronics part, there are power supply units to power up all that stuff and of course resistors, cables and MOSFETs are needed aswell.

Therefore the electronics used are:

  • Raspberry Pi, Model B + 8GB SD Card
  • 2* NFC tag, circle, max. 2.5 cm diameter
  • EDIMAX EW-7811UN Wireless USB Adapter

  • Power Supply, Output: 12V, 2.5A, Pollin 350 056
  • Power Supply, Output: 5V, 16A, TDK-Lambda LS-100-5 AC-DC

  • 2* Door Switch, COM-11142
  • 2* Light Sensor, TSL2561
  • 2* Temperature Sensor, DS18B20+

  • 2* Solenoid, ROB-11015
  • 2* Servo motor, Hitec HS-311
  • 3* Peltier element, 5.0 x 5.0 cm, TEC1-12708
  • 4* Fan, Sunon EB40100S2
  • Buzzer, 3.3V, min. 1200Hz, max. 2000Hz
  • 50* White LED, COM-09850
  • 2* RGB LED, BlinkM

  • Resistor 4.7k Ω
  • 10* Resistor 18 Ω
  • 9* Resistor 10k Ω
  • Level-Shifter, 3.3V to 5V, 2-channels, I2C capable, BSS138
  • 9* MOSFET, IRLZ24NPBF

  • 2m electrical cable with plug, 230V capable
  • 50cm electrical cable, 230V capable
  • 50m litz wires, cable cross-section 0.5 mm²,different colors
  • Micro-USB B cable with plug
  • Cable lugs, different sizes
  • Male / female soldering headers
  • Electrical tape
  • Shrink tubing
  • Cable relief
  • Luster terminal
  • Soldering equipment

Machines:


  • Bench saw
  • Battery-powered screw gun + Hole drill attachment 35mm + Common attachments
  • Crimping pliers for cable lugs
  • Laser cutter
  • Soldering iron
  • Multimeter
  • 3D printer
  • PCB mill

This would be great for storing medication that needs to be kept at a constant temperature and kept away from kids and stuff.