1. LED & Resistor
void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
Ohm's Law
Ohm's Law
Resistance = Voltage ÷ Ampere
Ω = V ÷ A
Arduino output 5 V
LED requires 2 V, 0.02 A
Minimum Resistance = 150 Ω
150Ohm Resistor with 1% tolerance.