my 2 cents to bike cree mods

[alex_g2k]

just want to show my bike front light made with 3 cree-r2 emitters and 4x18650 battery pack. i didn't buy new batteries for the light but used four from laptop's which were still alive and provided approximately 1800mAh each. they still give me 3.2 hours of runtime which is not bad at all. i think i'll replace them with fresh ones by next season. i made the body of the light from aluminium plates and used "cold-welding" epoxy to attach them together. and i used thermal silicone compound inside the body for providing decent thermal conductivity. i modified simple 2A 18650 charger to make it possible charging battery pack without removing batteries from it but just by connecting it with cable to the charger. there are some pictures of what i get. haven't got any beamshots yet because of the bad weather issues, but i'll place them as soon as it becomes possible. feel free to ask me any questions if you are interested.

 

[Changchung]

Congrats, very nice job..

 

[Illum]

jeez...read up rrules on posting pics will ya?

Images... If you post an image in your post, please downsize the image to no larger than 800 x 800 pixels.

Serial port?!
a programable battery charger/battery pack? neat:thumbsup:

 

[pe2er]

Nice build
Very innovative setup of the light.

However, looks like you could really hurt yourself should you hit the light in a fall The solution of xourse is simple, don't fall

:devil:

 

[alex_g2k]

jeez...read up rrules on posting pics will ya?

Images... If you post an image in your post, please downsize the image to no larger than 800 x 800 pixels.

Serial port?!
a programable battery charger/battery pack? neat:thumbsup:

images fixed.

serial port has nothing to do with programming though. it was only used to take an advantage of two channel charger to connect each channel separately. also it can handle 1A current per each pin which is enough. and these connectors have draw-bolts. it was easy to get these connectors in local electronic store either.

Nice build
Very innovative setup of the light.

However, looks like you could really hurt yourself should you hit the light in a fall The solution of xourse is simple, don't fall

:devil:

thank you! actually the design of the light came to my mind quite spontaneously. first thing i did was attaching three reflectors together and then i tried to find a solution for making a body for them. i couldn't find a metal tube of the exact diameter to fit three reflectors into it so i decided to find another ways if design. i had an aluminium plate, so i just cuted it to appropriate pieces with my dremel and atatched them together with two-component epoxy. this solution gave me a perfect fit with reflectors and as a result a decent thermal conductivity which was improved with thermal compound. i attached radiators later when i realized that the body gets very hot after just a several minutes of working. so now it doesn't get any warmer then 60 degrees celcium in a room and stays simply cold during riding.

 

[Illum]

serial port has nothing to do with programming though. it was only used to take an advantage of two channel charger to connect each channel separately. also it can handle 1A current per each pin which is enough. and these connectors have draw-bolts. it was easy to get these connectors in local electronic store either

ahh,
Serial ports use 22-24 gauge wires that connects the pins....
22 gauge is rated 7 amps for chassis wiring but about 0.95 amps for power transmission

 

[msxtr]

Hi, super nice desing light!!!!!

Greetings - Saludos

msxtr

 

[thysmeades]

nice, what driver r u using and what configuration are the batteries arranged in?
thys

 

[alex_g2k]

nice, what driver r u using and what configuration are the batteries arranged in?
thys

i used Cree R2 Drop-In single mode modules from DX which supposed to have kennan boards in them. i used one of those for my previous DIY project which i was very happy with. but after i had recieved the second batch of them i noticed that they were not the same after doing some tests. i posted a review of them on DX forum. if omit the ditails, they simply don't provide decent regulation and efficiency when they are supplied with voltage of two 18650's. so i decided to use 4 parallel connected batteries rather then make a 2s2p battery pack. as long as the cells are not disbalanced very much i charge them connected in parallel without any troubles.