I saw a couple circuit diagrams available for the Arduino but nothing for the much smaller and cheaper ATTiny85, which is all this project really needs. I used the PWM output via analogWrite() on 2 pins (0 and 1) for a very realistic random flickering flame effect, and then just used digitalWrite() for the 3rd pin (2) to turn it on and off to make it appear to be blinking.
I also wanted it to make it a lot brighter than most projects I'd found online, so I used 3 pairs of LEDs in parallel for a total of 6 LEDs, 2 of which are basically on more than off (not really flickering - using the 3rd pin which can't use PWM) for even more added brightness. I used 3 AA batteries for 4.5 volts, and you could get away with less than 100 Ohm resistors, probably half that. You calculate resistors needed for LEDs with this online calculator: http://ledcalc.com/. You could also power it with 3.3 volts and use smaller resistors still.
Note: I lined the pumpkin with tin foil on the inside to make it brighter.
LED Flicking candle flame effect to PIMP DAT PUMPKIN
Arduino
// LED Flicking candle flame effect to PIMP DAT PUMPKIN/* Halloween 2016 Barry Wise Borrowed and enhanced code from: http://www.instructables.com/id/Realistic-Fire-Effect-with-Arduino-and-LEDs Made ATTINY85 shield for Arduino like this: https://www.youtube.com/watch?v=9LjfkjwMqXI How to use Arduino as ISP for programming via said shield: http://www.kobakant.at/DIY/?p=3742*/intledPin1=0;intledPin2=1;intledPin3=2;voidsetup(){pinMode(ledPin1,OUTPUT);pinMode(ledPin2,OUTPUT);pinMode(ledPin3,OUTPUT);}voidloop(){// analogWrite(ledPin1, random(50)+200);// analogWrite(ledPin2, random(80)+170);analogWrite(ledPin1,random(250));analogWrite(ledPin2,random(250));digitalWrite(ledPin3,HIGH);delay(random(200));digitalWrite(ledPin3,LOW);}
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