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Light Emitting Diodes


Typical Voltage Drops

ColorVoltage Drop
Red1.7
Bright Red1.9
Orange2.0
Green2.1
Bright White3.4
Blue3.4


Using LEDs

By syncing the LED to the GPIO, you can remove the constraint of the GPIO max current.


Multi-Color LEDs

Calculating Resistance Needed

For brightest LED without exceeding max GPIO current of 12 mA (ESP8266): 

V = I * R

R = V / I = 3.3/0.012 = 275 ohms


Question:

Should we consider the voltage drop in the following calculation? Should it be: 

V = I * R

R = ( Vss - Vdrop ) / I = (3.3 - 1.7) / 0.012 = 133 ohms






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