Unihedron


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Portable Tools for Physics and Astronomy:

USB Sky Quality Meter with Lens

USB connected Sky Quality Meter with narrow Field-of-View

Ethernet Sky Quality Meter with Lens

Ethernet connected Sky Quality Meter with narrow Field-of-View

Sky Quality Meter with Lens

Narrow Field-of-View Sky Quality Meter with lens.

Sky Quality Meter

An affordable meter for measuring sky brightness for astronomers!

CapSelector

An The Unihedron CapSelector provides an inexpensive way to tune a VLF loop over a wide range (120 - 5510 pF) of capacitances. It replaces expensive and bulky high-value variable capacitors or decade capacitor banks. It is a passive device and therefore requires no power.

$Diffraction grating$

Diffraction grating

This diffraction grating is a standard diffraction grating used to separate white light into its spectrum.

Nu-B

Narrow-band low-cost spectral light source.

Outdoor housing for Sky Quality Meters

This housing is suitable for the SQM-LE or SQM-LU. It also fits an optional Power over Etherent device.

Posters:

Electromagnetic Radiation Spectrum poster

This poster includes all known ranges of EMR including brain waves, communication frequencies, microwave background radiation, etc, as well as the audio spectrum, all organized by octaves.

Pi poster

Upon closer examination, 350,390 digits of pi are visible. The most commonly recognized digits are visible from a distance.

Primes poster

Upon closer examination, 54,222 primes are visible. The first 122 prime numbers are visible from a distance.

e poster

Upon closer examination, 350,390 digits of e are visible. The most commonly recognized digits are visible from a distance.

Phi poster

Phi, the golden ratio. Upon closer examination, 350,389 primes are visible. The first 439 digits are visible from a distance.

Open Source:

gonvert

A very complete Unit Conversion Utility that runs on Linux and Windows. All units in a category get converted while you type. FREE / Open Source.

Magnetometer

This project measures slight changes in the Earth's magnetic field. These changes are useful for determining the occurence of Aurora/Astralis Borealis.

4to20mA Utility

This calculator helps determine various values related to 4 to 20mA conversions used in PLCs and instrumentation. FREE / Open Source.

physiotimer

Physio Therapy Timer
A timer for physiotherapy exercises. Open Source.

grocget

Grocery Getter Helper
This program will enable you to shop for groceries much faster.
I originally needed something like this many years ago but did not have the tools to program it for Windows, so I found something close to it written by someone else and used that until I found the tools to write my program for Linux. FREE / Open Source.

saydate

A Linux shell program that says the date. Simply type saydate and the program speaks the actual date (e.g. "the date is thursday november the twenty-fifth nineteen-ninety-nine").
saydate home. FREE / Open Source.

Papers:

Circadian Appetite Control

Did you know that the visible light spectrum can help ?

Find out how.

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