The Fitzroy Storm Glass was first introduced by botronics and his fine ible.
( he also joined the ibles community 3 days before I did :-)
When I needed a really nice gift for my wife's bornday celebration and this was what I chose to make.
During the early 1700's, the Admiral Fitzroy glass was used by sailors attempting to forecast ocean weather.
For the next 200 years they relied on the changing crystal formations to predict the weather.
Today one supplier actually believes that the electromagnetic solar changes can affect the crystals patterns inside the glass.
The instrument is a fragile glass vial with a clear water like liquid.
I chose making this in Steam Punk as my daughter likes this style very much.
A single White LED and bit of electronics allows a strikingly detailed night observation.
The hanger is made of plexiglass and metal to firmly hold the storm glass and act as an illumination night light.
You can get a storm glass from Klockit..
Step 1: LED CIRCUIT
You have to like this very simple LED circuit. .... Only Four Components including the Light Emitting Diode.
Still the circuit is worth bread boarding before publication
Circuit Operation ;
See the circuit diagram. A normal DC wall wart has a 3' to 4' foot cord and as such
it is good practice to put a capacitor at the far end where the regulation occures, to avoid micro power drop outs.
The LM317 and 68 ohm resistor make a standard constant current regulator that is set
to about 20 milliamps in series with any LED.
The Components ;
- One White LED of your choosing.
- One LM317LZ Regulator TO-92
- One 68 Ohm 1/8 Watt Resistor.
- One Tantalum 22uF to 47uF 25V Capacitor.
- A small Wall Wart ( 5V to 24Volt DC output )
- A matching Coaxial connect Receptacle.
You may use a TO-220 regulator as well as the smaller TO-92 package.
See a cluttered electronics work bench ( No clear level surface :)
I used the smallest Wall Wart which has a ( 6Volts DC Output capable of 200 ma ) and
a Coaxial delivery plug