Introduction: DIY Electronic Birthday Blowout Candles

Step 1: The Circuit

Step 2: Building the Circuit Board

Step 3: Soldering the Circuit Board

Step 4: Programming the Micro

Step 5: Using the Candles

To power the circuit, you need 4 batteries of 1.2V, AA or AAA size or 3 batteries of 1.5V (AA or AAA size).

Using the blowout candles is easy. Of course you need a cake to be able to use the candles :).

We organized a fictitious birthday party with a virtual cake to celebrate the project and a video of that party and the birthday candles



If the video isnt working, you can try this youtube link: Birthday Candles Video

Comments

author
Penolopy Bulnick made it! (author)2014-01-22

Hi!

Hey, this is a great Instructable and is very informative. Just one thing is missing... pictures! It really helps a lot when trying to follow directions so you should consider taking some photographs. Once you do that leave me a message so that we can publish your work.

Thanks for the cool Instructable and we hope to publish this soon!

Best,

Nicole, Community Support Manager

author
astral_mage made it! (author)2014-01-18

pic would truly be awesome as well. not just blank steps. but ill chalk it up to being new to the instructables, an 4getfullness.

author
gharutyunyan made it! (author)2013-11-04

no pics :( empty steps!

author
Adambowker98 made it! (author)2012-04-15

So, um.... How do you make it? All the steps are blank!

author
Lithium Rain made it! (author)2011-04-26

Hey, you have a bunch of blank steps on here. Nobody can figure out how to make this. It's very sad T_T

author
purpulhaze made it! (author)2010-04-13

Do i need to be a pro member to see this instructable?

author
watermelonhead made it! (author)2009-08-14

pics pwease?

author
T3h_Muffinator made it! (author)2008-07-11

This looks awesome! I'm just wondering - where's the analog input pin of the uC? I looked at your schematic and it seems as if you just have it in a resistor network on VCC.

author
cedtlab made it! (author)cedtlab2008-07-11

Hi, Thanks for your comment. Tiny45 has several analog input pins. Pin1 (is PortB5 and is also ADC0 input ) is one of them. We used that to read the voltage at the junction of R3 and R4. R3 is the thermistor and R4 is a fixed value resistor. Since the other end of R3 is grounded, as the thermistor cools off, its resistance increases (the thermistor is an NTC, i.e. has a negative temperature coefficient) and so the voltage at the junction of R3 and R4 increases.

tiny45_pinout.JPG
author
bikeNomad made it! (author)bikeNomad2009-02-22

Why bother with the heater (R2)? It's a big load on the battery (though so are the LEDs...) and shouldn't be needed. Did you try using self-heating?

By using the self-heating of the thermistor itself you should be able to detect the cooling caused by air movement.

Just run enough current through the thermistor that it heats up a few degrees above ambient (and not enough to damage it), and look for quick changes in the port voltage.

You'd be best off to use a much smaller thermistor, though (perhaps something like this cheap thermistor.

author
bewakoof made it! (author)2008-07-11

Awesome work and extraordinary description

author
Derin made it! (author)Derin2009-01-02

BOLD

author
Derin made it! (author)Derin2009-01-02

'[linktest:// test for links]'

author
emuman4evr made it! (author)2008-09-20

Whats a thermistor, never heard of that before.

author
cedtlab made it! (author)cedtlab2008-09-20

A thermistor is a temperature dependent resistor.
More information is here:

http://en.wikipedia.org/wiki/Thermistor

Thanks,

author
=SMART= made it! (author)2008-07-29

Hahahahahaha Cool !!

author
nickstewartroc made it! (author)2008-07-17

This is AWESOME i think i will have to make this and put it on my birthday cake since its coming up in a month(August 12)

author
Culturedropout made it! (author)Culturedropout2008-07-23

Just be sure to use lead-free solder and other components. It'd suck to get lead-poisoning on your birthday... ;-/

author
cedtlab made it! (author)cedtlab2008-07-23

what we are planning to do is to put the electronics and batteries in a food grade plastic box with just the LEDs and sensor sticking out.

author
nickstewartroc made it! (author)nickstewartroc2008-07-23

Thats a good idea, i think that is what ill do for my cake :)

author
gauravrewatkar311 made it! (author)2008-07-20

good very interesting !!!!!!!!!!! all my regards go to the " IDEA MAN " GREAT THINKING i am expecting something new next month also!!!!!! great job

author
joshbond_2007 made it! (author)2008-07-17

you mean 4x1.5volts

author
Gadre made it! (author)Gadre2008-07-17

I mean four re-chargeable (NiCd or NiMH) batteries which are typically 1.2V each, so thats 4x1.2 volts Using 4x1.5V batteries (for example the alkaline ones) would not be advisable since the microcontroller cannot handle 6 volts.

author
papiya made it! (author)2008-07-14

cool..so the modela makes ready to use boards now!..gr8..lots of time saved

author
sotsirh194 made it! (author)2008-07-12

Just so you know this was featured in one of my electronics design magazine. It was way in the back and there wasn't much instruction on how to build it.

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