Sunday 20 January 2013

LED Cube 2x2

Logging 1st milestone in the LED Cube project.





The design of the 2x2 LED cube is fairly simple as each layer only consists of 4 LEDs.
Each LED has a positive terminal (anode) and a negative terminal (cathode). There are two methods to determine the LED's terminal.
Figure 1. Largest piece among the 2 conductors is the cathode.6


From the figure,
1. Anode is +, cathode is -
2. Observe flat surface at cathode compared to anode.
 
SuperBright Blue LED wavelength: 470nm
Forward voltage: 3.4v
Max forward current: 30mA
View angle: 0 to ~15 degrees.
Intensity : 4000mcd (max)

Resistance: 100 ohm , 1/8 watt (0.25 watt)
Theoretical max forward current : (5v output - 3.4) / 100 = 16mA

Actual current draw: 8.5mA (max due to pulse)
Actual voltage output: 4.8v
Actual voltage across LED:  ~3.4v
Actual power dissipated by resistor = (8.5m)^2 * 100 = 0.007A




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