My latest project has just reached the testing stage.
While not strictly in line with other CPF projects it does contain LED's!
Its a Heads Up Display to indicate the PPO ( Partial Pressure Oxygen) in the breathing loop of my rebreather.
Its based on a Arduino mini pro micro controller.
It monitors 3 O2 cells and displays their readings via 3 tri colour LEDs in the HUD in a sequence known as Smithers Code.
Other features include adjustable brightness depending on light levels, auto off, calibration mode and also future upgradable.
HUD its self is machined from Acrylic and consists of 3 Tri colour (Red, Orange, Green) LED's a LDR ( Light Dependant Resistor) small PCB and cable gland.
Housing is machined from Acetal with a polycarbonate lid.
Electronics pretty much consist of the Arduino mini pro a PCB a transistor and 10 or so resistors.
There is a single switch on the unit that wakes the unit from "sleep mode", calibrates and puts the unit to sleep.
The switch ( not pictured) hold a magnet to operate the hall effect sensor.
Battery is a Trustfire 14500.
As this is a prototype the whole lot stands to be changed. Smaller Housing, Arduino FIO, 18650 battery....
As my first Arduino project it has been a bit of a learning experience but its been fun. I can see a few more projects in my future.