Number of LED’s from a digital pin
Question
How many LED’s I can use from a single digital pin such as pin no. 5
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Answers ( 3 )
Firstly, important thing is voltage drop of a LED. And voltage drop varies with color. If you using LED in series you can use only 2 LED’s and they will work at full intensity. Adding more LED’s will decrease the intensity of light. If you are using it in parallel you need to know the maximum output current Arduino’s digital pin can supply is 40mA (or 20mA continuous current) and most the LED require 20 mA. Connecting LEDs in parallel may cause current balancing issues and can affect the intensity of light.
Any example?
Sure. A typical LED requires 20mA and approx. 2-3V voltage drop
For series:
Current at every point in the circuit is same but voltage varies
So in series we can only use 2 LED’s that works with full intensity
For parallel:
Voltage at every point in the circuit is same but Current varies
As arduino UNO can provide 20mA continuous supply so,
Maximum LEDs = (Arduino Pin Current Limit) / (LED Current)
Maximum LEDs = 20mA / 20mA = 1 LEDs
So, you can safely control 1 LED from a single digital pin