LED Resistor Calculator
Supply voltage
V
LED colour
Red — 1.8 V forward
Yellow or amber — 2.1 V
Green — 2.2 V
Blue — 3.2 V
White — 3.2 V
Read it off the datasheet
LEDs in series
Forward current
mA
A standard 5 mm indicator LED is 20 mA. Modern high-efficiency parts are bright at 5 mA.
Series resistor
160 ohm
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LED Resistor Calculator
by Rule Calculator