Let's Make Robots!


charges all the devices via USB (phones-mp3s-iphones) where there is no power
Let us suppose that you want to charge your phone outside the house where there is no power the I Super USB charger is the device you need.It remplaces the PC's or … Read more

LiFePo4 Charger array

I don't suppose someone could tell me if I'm on the right track here?  I'm no EE, having a hack's grasp of circuits, just doing this to keep from idle hands.  Anyway, I've designed a LiFePo4 charging circuit with the hope to add it to 6 LiFe batteries--trying to make a battery pack I can just plug in for my little guy.  Anyways, I have no idea if I'm close--don't suppose someone could look it over before I try to etch it?

I'm using this IC:


website about batteries

Here is an excellent website about batteries and charging process :


In circuit charging of NIMH pack

I'll be putting together a 14.4v 5ah battery pack out of 12 solder tabbed C cells.  The raw voltage will be fed into a 100w step up DC-DC converter to supply 18v to a single board computer, and also to two

LiPo batteries and chargers question


I'm going to make an hexapod robot and I need a LiPo battery. The 20 servos (SG-5010), when moving, needs 12 A.

I've already bought some servos in the past from Hobby king, and now I was wondering if you can suggest me a LiPo which works with my configuration: http://www.hobbyking.com/hobbyking/store/uh_listCategoriesAndProducts.asp?idCategory=86&v=&sortlist=P

I want to buy from Europe to avoid custom duties. Also I'll need a charger. http://www.hobbyking.com/hobbyking/store/__216__408__-Battery_Chargers.html

How to make a battery charger (Question)

Are there any "rules" when choosing a battery charger? Lets say I have a 5v supply with 500mA current. What should the charger specifications be?

"Jar of Firefly" part 1 - Early Summer Project

"Jar of FireFly"

Ok its a start before the summer comes - by then the jar.....or a bigger jar will be full of Anamatronic FireFlies.

The idea is that the jar just keeps them safe - then i can open it up take them out and deploy the fireflies onto a bush or tree etc-etc

They will be controlled by picaxe 08s (128byte brain) in theory 1 picaxe will control 3 Fireflies.

Battery charger?

Hey! I want to be able to put rechargeable batteries in my robot and then plug it into the wall to recharge...in other words, I don't want to pull the batteries out to recharge them. Can anybody give me some pointers on that?