Realistic Fire Simulation - Revision history

Daniel: /* Final Result */

2016-01-05T10:36:57Z

‎Final Result

Daniel at 10:36, 5 January 2016

2016-01-05T10:36:06Z

Daniel at 23:38, 4 January 2016

2016-01-04T23:38:00Z

Daniel: /* Building */

2016-01-04T23:37:38Z

‎Building

Daniel at 20:31, 4 January 2016

2016-01-04T20:31:51Z

Daniel at 19:18, 4 January 2016

2016-01-04T19:18:35Z

Daniel at 18:53, 4 January 2016

2016-01-04T18:53:22Z

Daniel at 17:04, 4 January 2016

2016-01-04T17:04:10Z

Daniel at 11:06, 4 January 2016

2016-01-04T11:06:24Z

Daniel: Created page with "In this page is described how to create a realistic flickering fire effect with LEDs and an Arduino board. In this case I used a Digispark due to its small size. File:f..."

2016-01-04T10:45:20Z

Created page with "In this page is described how to create a realistic flickering fire effect with LEDs and an Arduino board. In this case I used a Digispark due to its small size. File:f..."

New page

In this page is described how to create a realistic flickering fire effect with LEDs and an Arduino board. In this case I used a [[Digispark]] due to its small size.

[[File:firesimled01.jpg]]

[[File:firesimled02.jpg]]

[[File:firesimled03.jpg]]

← Older revision		Revision as of 10:36, 5 January 2016
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	== Final Result ==		== Final Result ==
		+
		+	I have to say that I am very satisfied with the result, keep in mind that in real is nicer than in the recorded video:

	{{#evt:		{{#evt:

@@ Line 1: / Line 1: @@
 In this page is described how to create a realistic flickering fire effect with LEDs and an Arduino board. In this case I used a [[Digispark]] due to its small size.
-The intention is to give some light to a small clay decoration house, one of those prepared for lighting a small candle inside and evaporate water with essence. Instead of using a candle I put a simple battery with some LEDs inside but it looked too boring so I tried to imitate the movement of a candle inside it. Here it is described the design and process followed.
+The intention is to give some light to a small clay decoration house, one of those prepared for lighting a small candle inside and evaporate water with essence. Instead of using a candle I put a battery with some LEDs inside but it looked too boring so I tried to imitate the movement of a candle inside it. Here it is described the design and process followed.
 == Component Schematics ==
-The three LEDs (two reds and one yellow - I guess one red and two yellows would also look nice) are connected to the PWM ports of the arduino (Digispark, which has exactly 3 PwM pins).
+The three LEDs (two reds and one yellow - I guess one red and two yellows would also look nice) are connected to the PWM ports of the arduino (Digispark, which has exactly 3 PwM pins). The LEDs are connected logically inverted (the LED is powered when the pin is at LOW status and it is off when the pin is at HIGH status) because it is safer for most integrated circuits to drain power than to provide it (although for this microcontroller we are in the safe range).
 [[File:Fire_led_schema1.png]]
@@ Line 29: / Line 30: @@
 [[File:firesimled03.jpg]]
 == Code ==

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 In the next picture the connections for the LEDs in pins 0 and 4 have been soldered. Each pin has two 470 ohm resistors in parallel that make a total of 235 ohm (I did not have 220 ohm or similar). As the system is powered by 4.8v that makes a maximum of a bit more of 20 mA per LED, which should be bright enough and safe for the microcontroller. Visit the next section to have a look at code running in the board.
 [[File:firesimled01.jpg]]
 The next picture shows the system already assembled, the two conventional LEDs plus the one included in the board, with a 4x AAA 1.2v battery pack (giving a total of 4.8v). The battery pack has to be connected to the 5v and GND connector of the Digispark board (4.8v is enough). The Digispark board has a power on red LED that has been removed with a sharp knife because the continuous red light was spoiling the fire effect.
 [[File:firesimled02.jpg]]
 This picture shows the powered on system inside the bottom of the clay house, with the three lights already flickering.
 [[File:firesimled03.jpg]]

@@ Line 26: / Line 26: @@
 == Code ==
 <pre>
 int p1 = 0; // Set the 3 pins with PWM
@@ Line 53: / Line 55: @@
-Demonstration:
+For schematic 2 (reusing the LED attached to Pin 1, which is not "logically inverted"):
 {{#evt:

@@ Line 1: / Line 1: @@
 In this page is described how to create a realistic flickering fire effect with LEDs and an Arduino board. In this case I used a [[Digispark]] due to its small size.
 == Component Schematics ==
 [[File:Fire_led_schema1.png]]
 [[File:Fire_led_schema2.png]]

← Older revision		Revision as of 17:04, 4 January 2016
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	}		}
	</pre>		</pre>
		+
		+
		+	Demonstration:
		+
		+	{{#evt:
		+	service=youtube
		+	\|id=https://youtu.be/a-6UNgORXR8
		+	\|alignment=left
		+	}}

← Older revision		Revision as of 11:06, 4 January 2016
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	[[File:firesimled03.jpg]]		[[File:firesimled03.jpg]]
		+
		+	<pre>
		+	int p1 = 0; // Set the 3 pins with PWM
		+	int p2 = 1;
		+	int p3 = 4;
		+
		+	void setup() {
		+	pinMode(p1, OUTPUT); // Set the pins as output
		+	pinMode(p2, OUTPUT);
		+	pinMode(p3, OUTPUT);
		+	}
		+
		+	void loop() {
		+	int v1, v2, v3;
		+
		+	v1 = random(155) + 100; // Calculate the new light
		+	v2 = random(155) + 100; // intensity values for each LED
		+	v3 = random(155) + 100;
		+
		+	analogWrite(p1, 255 - v1); // Apply the light intensity
		+	analogWrite(p2, 255 - v2); // to each LED
		+	analogWrite(p3, 255 - v3);
		+
		+	delay(20 + random(80)); // Wait some random time for next udpate
		+	}
		+	</pre>