Blue LED ciruit

I am attempting to make this device pictured here. I am looking for someone with a knowledge of LED circuits to help me develop the board used to power the 6 flashing blue LEDs which, when first switched on has LED number 1 lit, then when a non-locking button is pushed the 2nd LED lights and flashes with the first still lit and flashing, and so on until all 6 LEDs are lit. When finally the non-locking switch is pushed all 6 LEDs are switched off? Is this possible. I'm new here and would appreciate any help you could offer. Thank you

Picture of Blue LED ciruit
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mark10110 years ago
You say the LEDs are blinking, they all flash on/off at the same time? or do they flash at different rates. Lots of details to write down and how important are the details to cost size ratio is important.
westfw10 years ago
It would be easy to adapt one of the circuits in my Driving lots of LEDs instructable to do this, but it would require programming the microcontroller to do what you want. Note that in general, it's not any more difficult to drive blue LEDs than any other color, unless you have a particularly low voltage circuit. Depending on your budget, it'd be slightly easier to do with a basic stamp or PICAxe or similar "high level programmable microcontroller."
anachronistic_protagonist (author)  westfw10 years ago
Do you design circuits? How much would you charge for a finalized design ready to print on a PCB of this circuit with a components list to be powered by a 3V coin cell? Thanks
Running on 3V would be tough, since blue LEDs like to have about 4V to make them light up. (TWO coin cells would do it with no problems.)

Custom electronics/software design by people who do it for a living is extremely expensive. Figure $50/hour, and this would probably be a four-hour job (minimum.) Say, an hour to drag the actual specification out of you (the picture shows more than the one button you talk about. Is there an on/off switch somewhere? Exactly what size did you need the PCB to be? How did you want the LEDs to flash? Defining all this sort of stuff is important and not as easy as you would think; if you do it wrong you get cost overruns and unhappy customers. Then an hour or so to do the PCB design (taking into account that the basic "connect some LEDs to a microprocessor design already exists) and maybe a couple hours for software (Hmm. Maybe less if you have a picaxe or basic stamp; thus explaining why those are so popular!)

Now here, we have a cooperative community, and I'm not a electronics design consultant, so I'm happy to provide you with this partially complete design that probably won't do you much good :-( Alas, this is a problem endemic of both open source and craft communities; what you get is something CLOSE to what you want, but unless you can go the rest of the way on your own, it's not entirely useful...

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LasVegas10 years ago
This would use the top half of the circuit I'm using in my Self Destruct Device collaboration. The bottom half of the circuit is a sound effect generator and wouldn't be necessary in your project. Just add a 555 flasher between the LEDs and the (-Q) output of each JK flip-flop. It would also require an additional flip-flop chip to extend the circuit and support 6 LEDs, but the idea's the same.
I will confess. I have little electronics knowledge, I can solder like a pro, but when it comes to actual circuit knowledge I'm lost, could you break it down for me? Thanks
That circuit is derived from a common "combination lock" circuit. Basically, with the flip-flops(Sorry... I called them JK flip-flops... This circuit actually uses D-type flip-flops) connected in that fashion, the switches have to be toggled in order (turned on or on-off) to the last flip-flop. If any are turned on, out of order, it resets the entire circuit.

This technique would give only one solution to your puzzle though. It would probably make a much more interesting game to use a PIC board that would scramble the combination each time the game is reset. Of course, the later would require some programming of the PIC.

You can purchase a PIC experiment board from the Make Magazine Store and various other places on the net. Then all you need do is connect your LEDs to the data-out ports and your buttons to the data-in ports. Well... That and program your game into it.