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Arduino Model Railroading – Simulated Flickering Fire

Another cool exhibit on your model railroad is flickering firelight. Whether it’s a hobo campfire, or a burning building, this adds to the layout’s realism. An Arduino, 3 130 ohm resistors, two yellow LEDs, one red LED, and you have a fire. Add a locomotive smoke unit for additional realism. This project is provided by Mike McRoberts.

Just connect a wire from pin 9 to the resistor, from the resistor to the long leg (+) of your LED, and the short leg to Ground. Repeat for pins 10 & 11. We put the red LED on pin 10, and the 2 yellows on 9 & 11.

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// LED Fire Effect

int ledPin1 = 10;
int ledPin2 = 9;
int ledPin3 = 11;

void setup()
pinMode(ledPin1, OUTPUT);
pinMode(ledPin2, OUTPUT);
pinMode(ledPin3, OUTPUT);

void loop() {
analogWrite(ledPin1, random(120)+135);
analogWrite(ledPin2, random(120)+135);
analogWrite(ledPin3, random(120)+135);

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