Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: osnap on December 29, 2007, 09:05:07 PM

Title: Batteries for $50 robot
Post by: osnap on December 29, 2007, 09:05:07 PM

I'm planning on making the $50 robot and ordered these for the RC battery pack:

http://servocity.com/html/6_0v_1450mah_nimh_battery.html

Now for my extremely noobish question:
I just noticed the battery pack has 3 wires... what is the third/gray one for?

Any input is appreciated, thanks!

Title: Re: Batteries for $50 robot
Post by: Dr_Worm on December 31, 2007, 01:26:23 AM

I believe that is for the ground.  :)

if you look at the upper right of the 50 dollar robot diagram you should see it:  http://www.societyofrobots.com/images/sbs_avr_schematic.png

Title: Re: Batteries for $50 robot
Post by: Admin on December 31, 2007, 08:20:26 AM

that white wire doesn't do anything (measure it with a multimeter to check)

its just cheaper to manufacture 10,000 three wire plugs than 5,000 two wire (for batteries) and 5,000 three wire (for servos) . . . its a mass manufacture thing.

Title: Re: Batteries for $50 robot
Post by: david_or_johnny on December 31, 2007, 03:37:30 PM

Yup! Admin is right.

Title: Re: Batteries for $50 robot
Post by: osnap on January 01, 2008, 01:19:41 PM

oh okay, thanks :)