power supply

I've been asked to do a small piece as a fund raiser for my Son's School - the idea is to make some small 'bots which will run around a course, either randomly then stop or round a fixed course for a random period of time (say 30 secs to 1 minute). I'd originally thought of bristle bots they're fun , quick to make and cheap - maybe 2 side by side linked "catamaran style". Ideally I'd work with the 10 yer olds to make them.

The idea is that they'll be used to select winners for a prize - pay fifty pence, if your bot stops on a prize winning square you get a prize!

Hi all,

 

I am new to this forum but i have stalked users of this site for sometime.

I have a project on the go that i am a little stuck on. I have come pretty far since the idea hit me many months ago but now i am at the tail end and wondering how i will power this thing.

I have been using an Arduino connected to a bunch of 595 shift registers which are then connected to 36 small dc motors via npn transistors. the motors are small mobile phone vibrating motors and i need them to run, as per datasheet, 3v @ 90ma.

 

I'm in the process of building a CNC machine right now and would like a little help from the experience ones.  Right now I have $250 saved up and counting.  I'm trying to figure out what to do about stepper motors, power supply, and motor controller.  I didn't know if it be best to just buy a package that have it all in one and what would you recommend.

Hi all,

I am currently working on a new robot and I will soon have to choose a way to feed it with power.

I've been reading about LiPo batteries, but I am still confused about how to integrate this kind of power supply in a robot. Here are a few questions I have in mind :

I need some ideas for deriving power for the electronics and servos on Yard Gnome. YD has a single large 24V motor that is powered by two 12V batteries in series.

Ideas:

What do you guys think?

 

Seperate power supplies for the motors and the µC or one batterij and some electronics to reduce the voltage :

9V for µC and 6V for motors

Hi guys,

This is an image from the Maxbotix site, a circuit recommended for removing electrical noise. I was wondering whether it is safe to replace the 100ohm resistor with a diode (with a low forward resistance), so that it can double up as a reverse voltage protection element.. ?

 

 

Helo, all

I tried to power Arduino (Duemilianove) and servos/motors it controlled with the same battery, but Arduino continuously restarted during the operation. Actually it was a surprise for me, since Arduino already has voltage regulator chip and filtering capacitors in the input circuits...

I solve this problem by supplying them with different batteries, but I don't like this solution. Could anyone help - how to provide single power supply?

I was wondering on a site about wireless video transmission, and ended up on this power supply board:

http://www.rangevideo.com/index.php?main_page=product_info&cPath=7_20&products_id=161&zenid=32f8d15754cc1b8054ef3d5a800f706a

Isn't it very very interesting?? 10 bucks and you have a selectable 3.3, 5, 12 output voltage with input between 4 and 35 volts!

Is there something i'm missing or is it very cool?

I just received the PICAXE 8 Pin Proto Kit from Sparkfun (yay) and it comes with what looks like a 9v battery snap clip but the datasheet says that I cannot use a 9v battery.  The text states:

"ONLY USE A 4.5V or 5V battery pack, not a 9V PP3 battery, as the power supply."

So what kind of a 4.5v or 5v battery packs uses the snap type connectors?