Step 7: start adding parts

first attach the 555 chip. pin 1 is in lower left corner. then the two resistors

on the proto-board i used it is really hard to tell where the rows & columns of connected pads are! i will try to use a much more obvious proto-board next time. with this one all the columns of pads are connected, with a break at the row underneath the 555. anyway be careful that you put the 555 straddling the break in the columns so its legs are not shorted together.

  • if you have never used a proto-board before, first get the basic circuit working on your desk with a solder-less proto board and then switch to the soldered one. basic instructions on proto-boards are on the web, such as here: http://www.doctronics.co.uk/prototyp.htm

that's great, very clean circuit too. Maybe you wish to read my <a href="http://www.instructables.com/id/BBB-Bothersome-Blinker-for-Bikes/" rel="nofollow">BBB instructable</a>&nbsp;;-) (http://www.instructables.com/id/BBB-Bothersome-Blinker-for-Bikes/)<br> <br>
&quot;Stop Police&quot; :-D
In many places, you can get heavily fined, because from a distance the lights resemble an emergency vehicle.
True, but police would be more likely to encourage than discourage their use. It's much better than riding at night without lights, which many bike riders do and don't get stopped for.
Ha, then you do not live in my country. 3rd brake lights for cars were forbidden, but as the general undesatnding was that these would increase safety, a date was set for them to become legal.<br>Eventhough everybody agreed that these increased safety and eventhough the law was written to make them legal, police were fining people who had these lights till midnight of the day before the law came into practice, After all, 'rules are rules'<br>These lights on my bike would no doubt get me shot.<br><br>But it sure is a good instructable
but you might get shot by a drug dealer :s
one can only hope.
the idea and the instructable is nice but can it be that i'm the only one who thinks that this amount of light is kind of dangerous? i mean if i would drive behind you, i would at least be distracted or slightly blindet (only seeing cyan dots all over the place). even my flashlight replacement (5red leds each 6000mcd 20&deg;) (thats about 0,5 lumen per led) has this effect if someone looks directly at it. i don't even want to imagine how it is with a 100 lumen led at eyelevel on a dark road.<br />
I can only hope that yes, you are the only one who thinks this amount of light is dangerous. How bright is 100 lumens compared to car tail lights? Or car headlights? Probably 30% as bright as tail lights and 5% as bright as headlights. Those also are at eye level, and are much bigger and brighter than any bike light you can buy or make. My reasoning goes like this: Cars and trucks are big hunks of metal that are hard to miss, yet evidently they need a lot of bright lights at night to make them visible to others. So what on earth makes anyone think that a cyclist (which is easy to miss even in the daytime) should just ride along with the usual piddly 20 lumen flasher? Furthermore, cars and trucks are relatively safe places to be in a crash, and yet they still have lights galore. Bikes, on the other hand, are very dangerous in crashes, and yet some people think cyclists should be apologetic about having bright lights that announce &quot;I'm here, don't hit me!&quot;
I didn't expect an answer after that time but okay ^^<br><br>My problem isn't really the amount of light that's shining in my eyes, it's the blinking. I quote myself here: &quot;only seeing cyan dots all over the place&quot;.<br>The other problem is the time when the LED is off, maybe it's not much maybe only about 1/10 of a second, but with 100 km/h (that is legal standard outside of towns in Germany and trust me on that: no one is driving that slow if no one is around) that are still 2,8 meters where the bike is invisible.<br>For the sake of argument...lets make that 1/100 of a second, how close was it the last time you where passed? Yes, that's the moment where you should think of the guy that almost killed you. Was it more than 28cm? Even if it's blinking faster as long there is no light while someone passes you IT IS DANGEROUS! If the cyclist makes any sudden sidemovements (maybe because of a dead rabbit or because he's drunk, doesn't matter) no light at the wrong moment can and end up someone getting hurt.<br><br>2 of this Lights max 10 cm apart, one lit up while the other is off would be awesome. Very visible from long range because of blinking and not too distracting while being close. Maybe connecting one led with a pnp and on with a npn transistor/mosfet after the 555 timer could do that.
<br>LED ALADDIN Limited <br> <br>All light sources in our houses or at work must give an appropriate amount of light depending on the type of activities we perform. While working on a task that requires medium concentration the illuminance in a room should be at least 300 lx. The desks and keyboards while working at a computer should be illuminated with about 500 lx and while performing tasks that require high precision and concentration the luminous flux density should be about 750 lx. For comparison the amount of light that is enough for relaxing and watching tv is about 20 lx. Under this value the human eye is not able to recognize the features of a face. <br> <br> <br> <br>Examples of suggested illuminance in rooms <br> <br>Living room <br> <br> 1.main lighting: 100-200 lx. <br> <br> 2.surface of a table for reading and writing: 300-500 lx. <br> <br> 3.dining table: 300-500 lx. <br> <br> 4.computer stand: 500-750 lx. <br> <br>Kitchen <br> <br> 1.main lighting: 200-300 lx. <br> <br> 2.under shelf lighting: 500 lx. <br> <br>Other rooms <br> <br> 1.hallways, stairs: 50-100 lx <br> <br> 2.bathroom and toilet: 300-500 lx <br> <br>Other exemplary values <br> <br> 1.facial features recognition: 20lx. <br> <br> 2.sunny day: up to 10 000 lx. <br> <br>Multifunctionality of lighting <br> <br>While designing lighting in a house or flat it is important to keep in mind, that very often one room is used for many different kind of activities. For example a living room is a good place to relax and watch TV (where a subtle, slightly diffused light is most appropriate) but also for family meetings and meals for which the luminous flux density should be about 300-500 lx. This is why we should not limit the light sources to only one, but to few different lighting points that can work independently from each other. <br> <br> <br>Many sources of light in one room <br> <br>Due to the fact that most of the rooms in our homes are used for different activities, it is suggested to use multiple independent lighting circuits. A very good solution, that is more and more popular in interior design, is diffuse lighting. Diffused light may be produced both by a reflection of light from a completely nonspecular surface and by using multiple small point light sources. <br> <br> <br>Energy efficient and environmentally friendly <br> <br>While designing the lighting in a house it is good to choose light fixtures that can work with energy saving light sources. This environmentally friendly lighting not only helps to save money, but it is also shows our care about the environment. <br> <br> <br> <br>Good quality light sources <br> <br>We should always remember to choose good quality light sources. Very often a theoretically cheaper light source is actually more expensive because of its shorter lifetime and because its performance is much lower than stated by the manufacturer. <br> <br> <br>Contact LEDaladdin <br>LED Aladdin Limited <br>No.406 HongTeng Building, <br> <br>No.392# Xihong Rd,Gulou. <br> <br>Fuzhou,Fujian. <br> <br>350002 <br> <br>China <br> <br>Tel. : +86 591 6310 1956 <br> <br>Fax. : +86 591 2285 5952 <br> <br>E-Mail : info@LEDaladdin.com <br> <br>WEB: http://www.ledaladdin.com/index.html <br> <br> <br> <br> <br> <br> <br> <br> <br>
Must the transistor be able to handle 24amps? It's alot easier for me to get a p-channel that handles 100V 10A, sorry but haven't used one of these in years.
What is the value of Q1 transistor ultra-low-threshold PFET ????
Nice light, I am a bike paramedic and would like to use a PIC (16F628A) in place of the 555 to provide 2 alternating flashing lights. would the same moset placement work for me?<br /> <br /> Thanks in advance
Can I forgo the circuit board modification and just replace one of the existing led with the high powered led? someone please tell me please cos I really really wanna do that...
m new to electronics can u tell me the use of the circuit you build?
I just finished mine! I tried to make the blinkers and circuitry easily detachable from the bike so I can take it all inside when I park. I also put a 5k pot as R2; dialing it to zero gives a solid light. And damn, it is bright. Thanks, Dan.
The lumiledsfuture link is a parked link. You should update that section. How about using one of the leds from superbirghtleds.com? They have 1 watt lights, would it be better to have 3x1watts vs. 1x3watt light? Perhaps you can spread the light out better.
Can I use the same components and run the circuit on 4AA 2700mha Rechargeable and thus have more power from the 3W luxeons? IE will the extra power available simply make the LED brighter with no ill effect on components, obviously the led will need heat sink but what about the FET? or should it be heatsinked anyway for safety Basically I just want a single 3W led to blink at as high a brightness as possible from 4AA batteries
I think I am going to build your light. What are the possibilities of using one the radio sh*ck 7.2v or 9.6v NiCad rechargeables? Would it overheat the LEDs or have other negative results?
This is good and you could also use a bike light generator th keep batteries charged as you drive. You would only need voltage reducer from 6 volts to 3.
Just made a rear flasher (pictured here) and an independent front flasher. Used Urine Specimen bottles -- every thing tucked in quite nicely. Thanks for the Instructable. Just unscrew to access the batteries.
Anyone have experience building LED systems to run off dynamo hubs?
You must be getting super specials deals; when following your sourcing links, I get $7 per LED +$9 shipping. Any better deals?<br/><br/>Love of the idea of the project, but I have a couple of questions.<br/><br/>Would a configuration of 5 cells (6.0V) driving 2 LEDs serially work as well? Or 3 NiMH cells (3.6V) + dropping resistor (0.6 V)? Don't know how circuit would have to change to accomodate these 2 scenarios. The reason I ask is as follows.<br/><br/>Without taking into account wiring/circuit losses or voltage suppression of NiMH cell in winter biking weather(~20-30 F), for most of the runtime, I expect supply voltage from 2 NiMH to be 2.2-2.4 V (2 x 1.1-1.2V).<br/>According to pg 10,11 of the datasheet <a rel="nofollow" href="http://www.lumileds.com/pdfs/DS46.PDF">http://www.lumileds.com/pdfs/DS46.PDF</a><br/>at those voltages, I should get 300-600 mA, which translate to 0.2-0.5x relative to &quot;normal&quot; flux.<br/>Isn't 20% a bit on the low side?<br/>The datasheet say these LEDs take 2.31 V minimum, 2.95 typical, 3.51 max. On the plus side, at winter temps, looks like the red/orange/amber LEDs are more efficient.<br/><br/>I'm an electrical noob, so any comments appreciated.<br/>
skeen that was perfect and fabulas
sure you can do it with more cells, one of my goals was to only use 2. under-driving the led means no resistor is needed and the efficiency is very high, and run-time is improved.
Thanks for the feedback Dan. Why a P-channel MOSFET vs N-channel? From research, N-channel is more efficient. I'm not sure which stat to look at to judge whether &quot;comparable&quot;? Is it the Gate Threshold Voltage (V(gs(th)))? <br/>Fairchild specs (min=-0.4V, typ=-0.7V, max=-1.0V) <br/>Would this MOSFET work<br/>ON specs (min=1.0V, typ=1.5V, max=2.0V)<br/><a rel="nofollow" href="http://www.datasheetarchive.com/pdf/2520965.pdf">http://www.datasheetarchive.com/pdf/2520965.pdf</a><br/><br/>Thanks in advance.<br/>
Dan, awesome rear light, thanks, when I turn mine on it flashes at various different rates then after about a minute it just stays on steady - any idea what is most likely to be at fault? Thanks
i assume it is fairly random flashing each time? either a loose connection somewhere, on a total disconnect on the gate of the mosfet (floating gate can randomly switch)
Thanks Dan, my connections seem good, I might try swapping the mosfet out. Cheers
I built both a front and rear flasher for myself, and made one for my daughter too. Great instructable. I actually dispensed with the old bike light housing and used a trailer clearance light (about $2 at WalMart), with all the innards removed. Then I attached a hose clamp to the housing to put it on the bike. Works great!
Hi Dan This looks like a great light and I fancy having a go at putting one together. I'm going through the parts list and I always struggle with getting the right capacitors (I'm fairly new to electronics). I can't find any reference to the Xicon cap that you mention and am looking for a suitable alternative. What material is the cap that you have used? It looks from your diagram that it is polarised? Any help you could give would be appreciated. Paul P.S. Anyone in the UK found a place to pick these parts up easily? Realy struggling with matching specs.
Can 'anyone' help with what type of capcitor that is? I'm pretty new to this and whilst I can put things together, I always struggle with the parts list.
any kind of cap is fine
Hi Dan, Like everyone else it seems, I love your instructables and have read and re-read them a zillion times. I'm building this one (we all reallly need better bike lites), and have plugged the circuit into a breadboard. I'm new to electronics, and without real knowledge, I don't know how to debug the result. The light shines but doesn't blink. R1 and R2 are 10K ohm, C1 is 10uF (long leg connected to pin 6 of the timer, short leg goes to ground). The rest is stock per your instructions from Mouser. The LED (LXHL-LH3C) lights, but doesn't blink when I connect the positive side of the led to Pin 2 of the PFET, and the neg side to ground. I've tried replacing R1 and R2, C1, and even the timer (TLC555CP) -- all with same effect. Is the PFET bad? Is there a reasonable way for me to debug this? I hope this is the right place to ask this question. Thanks a lot for any insights, and the great instructables -- keep up the great work.
try connecting regular red led to pin 3 of the 555, it should blink.
Great - thanks Dan. It blinks. I must have blown up the PFET. With Alkalines and no zener diode, the circuit would run at 3 V instead of 2.4 for rechargeables. Is that too much voltage for the LEDs (hot), or too much voltage for other circuit components (burn out)? I was thinking the diode was to keep the LEDs from getting too hot without a heat sink, but then with even a 50% duty cycle, they're only on half the time....
great instructable:) do the leds need a heatsink?
no - average power for them is under a watt so the 'star' is enough heat sink.
Are you selling any for those of us who do not have a clue as to your schematics or any of your electrical thingees.
Hey!<br/>I would also be interresting of buying one! they look nice, and are very bright.<br/>Nice work =)<br/>
Great light! Can I use more than 2 luxeons in 1 circuit and how do you wire the LEDs, parallel or serial? thank you...
can you use 2 luxeons in 1 circuit and how do you wire them? paralled or serial? thank you...
Thanks Dan for the excelent instructable for the night riding cyclists! I´ve been always looking for better tailights for my bike since I use to train before dawn several days a week. Currently I use a Cateye TL-LD600 which is quite bright when correctly aligned. However, even more light is even safer. I´ve been looking at the expensive Dinotte light, and I think they use Luxeon LEDs at full power with 4 AA batteries. Can your circuit be used with 4 recharchable AA´s in a battery pack? Maybe the LED would need additional heat disipation? Thanks again!
Bicycle headlights come in a larger housing than the tail light and sometimes use D-cell batteries. Your electronics might fit inside the larger headlight housing. If so you could run the wire to the tail light instead of running from the tail to the head. That might hide your business and neaten up the appearance. Another general offering: silicone can be very effective or very ineffective depending on the application and installation. Clear silicone is easily attacked and degraded by UV light from the sun. Black silicone is resistant to the UV. For any parts exposed to sunlight you might consider using black for a longer life and seal. Being black it is obviously more visible, so you would have to weigh the benefits of the improved UV protection against the appearance of black goo. There are probably some application techniques to consider, too. The cleaner and drier your parts, the better silicone will adhere and seal. If you want a good seal, you pretty much need to place the parts in final position and apply the silicone to both at once. Silicone skins immediately upon coming out of the tube, so pushing a dry part into freshly squeezed silicone usually only forms a permanent seal on one side. Higher humidity means faster skinning and curing.
good advice! i actually used hot-melt glue here, it looks similar to silicone.
Hot glue. That works too. For hot glue you can get a melting pot at Hobby Lobby or your local hobby shop (a girly-man hobby shop, not one with lots of RC car, planes, and trains). Melt the hot glue in the pot and dip the part into the glue when you're ready to attach it. Then you only get the glue where you need it. So, in your case, you would dip the bottom of the white lens into the glue about 1/4 inch and, without wasting a lot of time, attach it to the red lens. You want to have a little extra glue up the side of the lens so it will sag slightly and form what is known as a fillet (FILL it, not fuh LAY) at the place where the two parts meet. The fillet will help with stresses at the connection point. I wish they made a hot glue syringe.
Do you know what is the temperature they heat up? could a bain-marie do the job? How about plastic emissions? It could be a nice, cheap, way to do this without buying anything (other maybe than an old pot for a buck in a garage sale)

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Bio: Dan Goldwater is a co-founder of Instructables. Currently he operates MonkeyLectric where he develops revolutionary bike lighting products. He also writes a DIY column for ... More »
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