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Re: Combine Multiple Li-Ion Batteries?

 by chartle ¦  Thu Jan 30, 2014 9:36 am ¦  Forum: Projects ¦  Topic: Combine Multiple Li-Ion Batteries? ¦  Replies: 3 ¦  Views: 945

Ah yes parallel vs serial connection. Just wondering if just buying the same battery from the same manufacturer is enough and they may be have to be matched a little better. Also I'm not sure how the individual protection circuits could mess up the output. What happens when one battery cuts out befo...

Re: Combine Multiple Li-Ion Batteries?

 by chartle ¦  Wed Jan 29, 2014 7:44 pm ¦  Forum: Projects ¦  Topic: Combine Multiple Li-Ion Batteries? ¦  Replies: 3 ¦  Views: 945

Not an expert but the description for the 6 aH has this. These three cells have been match for internal impedance and can be fully charged and discharged in parallel. Almost every other multi cell li po battery pack has a multipin plug that breaks out the individual cells so they can be charged indi...

Re: How low, voltage wise, can you go on a standard servo?

 by chartle ¦  Tue Dec 31, 2013 6:17 pm ¦  Forum: Projects ¦  Topic: How low, voltage wise, can you go on a standard servo? ¦  Replies: 3 ¦  Views: 950

You will need to consult the servo's datasheet for voltage references. How many servos are on this spider? You will probably need to use a servo controller that operates over serial. Another thing you need to investigate is the current rating for your Lipo considering every servo will most likely n...

How low, voltage wise, can you go on a standard servo?

 by chartle ¦  Tue Dec 31, 2013 1:25 pm ¦  Forum: Projects ¦  Topic: How low, voltage wise, can you go on a standard servo? ¦  Replies: 3 ¦  Views: 950

I have some projects in mind that I want to run off of 1 3.7 lipo battery. I have found single cell servos but I was wondering if a regular small "9g" 4.5 - 5 volt servo will work at that voltage. I have a tiny RC spider that I would like to convert to maybe a line follower or dark seeking robot tha...

Re: if there's one thing that's always missing, it's insulat

 by chartle ¦  Sun Sep 29, 2013 9:44 am ¦  Forum: SparkFun Product Questions ¦  Topic: if there's one thing that's always missing, it's insulation. ¦  Replies: 10 ¦  Views: 2503

I have always heard it called Chinese finger. Nice thing about this stuff is if you put in in compression, the inside diameter opens up enough to pass mid sized connectors though. Bad thing is you do need to melt the ends and somehow tie it to the ends. I like to use self adhesive heat shrink tape....

Re: Looking for a Spool to Mount to a Motor

 by chartle ¦  Sun Sep 29, 2013 7:44 am ¦  Forum: SparkFun Product Questions ¦  Topic: Looking for a Spool to Mount to a Motor ¦  Replies: 10 ¦  Views: 3516

ServoCity.com sells tons of stuff right up this alley. I'm not sure if I love you or hate you for posting that link! :lol: Thanks, Chris Yes I too hate that I know a Web site exists that has every mechanical part I have ever dreamed of needing during my 50 years or so years of life. I now no longer...

Re: Hose to use with Squirrel Cage Blower (Fan) COM-11270

 by chartle ¦  Wed Sep 04, 2013 4:58 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Hose to use with Squirrel Cage Blower (Fan) COM-11270 ¦  Replies: 8 ¦  Views: 2768

Wow; very helpful. Did you LOOK at the hose I selected? The only hoses I found at the "clown" stores are too thick, stiff, or could collapse if bent. Also, the two closest hoses at Home Depot were more than $3/ft. I'll post a follow-up when I get my Hosecraft hose. Ok I guess you already ordered bu...

Re: Thread/Yarn that changes color when introduced to a batt

 by chartle ¦  Mon Aug 26, 2013 12:02 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Thread/Yarn that changes color when introduced to a battery? ¦  Replies: 3 ¦  Views: 603

How about EL wire or masked EL panels under the cloth?

I can't imagine anything that would work with just conductive thread and the paint.

Re: LED Light Tube

 by chartle ¦  Sun Aug 11, 2013 6:21 am ¦  Forum: SparkFun Product Questions ¦  Topic: LED Light Tube ¦  Replies: 3 ¦  Views: 496

I think its much simpler. They look like automotive fuses with their ends drilled out. I'm going to look more closely but I think I see letters stamped on those metal ferrules. Ok looked again and the markings look like volt and amp ratings. I think they are filled with epoxy or some other pour-able...

Re: Smart Camera

 by chartle ¦  Wed Jul 17, 2013 11:53 am ¦  Forum: SparkFun Product Questions ¦  Topic: Smart Camera ¦  Replies: 8 ¦  Views: 1114

Here are two places that are in the "right direction"... http://www.cmucam.org/projects/cmucam4/ http://nootropicdesign.com/projectlab/2011/03/20/arduino-computer-vision/ I forgot about the CMU cam. Looks like you could use one of these to point the IP camera. :think: Of course the foreground and t...

Re: Smart Camera

 by chartle ¦  Wed Jul 17, 2013 7:00 am ¦  Forum: SparkFun Product Questions ¦  Topic: Smart Camera ¦  Replies: 8 ¦  Views: 1114

Yea let the camera do the heavy lifting. A lot of IP cameras are also wireless. http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=6825689&CatId=5203 Of course there are already IP cameras with built in pan, tilt and even zoom. http://www.tigerdirect.com/applications/searchto...

Re: Faucet Project

 by chartle ¦  Sat Jul 13, 2013 4:59 am ¦  Forum: SparkFun Product Questions ¦  Topic: Faucet Project ¦  Replies: 5 ¦  Views: 631

Mee_n_Mac wrote:My first thought is that measuring the faucet angle(s) is almost as big and expensive a job as measuring the flow rates.
Also flow rate sensors can be hid under the sink. To measure the angle you would have to have some contraption attached to the handles.

Re: Reliable, continuous 1rpm motors

 by chartle ¦  Thu Jul 11, 2013 6:28 am ¦  Forum: SparkFun Product Questions ¦  Topic: Reliable, continuous 1rpm motors ¦  Replies: 17 ¦  Views: 2608

Yes it seems for true sync using independent multiple motors and electronics I would assume you would need encoders on every single motor and something keeping track of it all.

Re: Reliable, continuous 1rpm motors

 by chartle ¦  Wed Jul 10, 2013 2:29 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Reliable, continuous 1rpm motors ¦  Replies: 17 ¦  Views: 2608

Hello all! So, an update: I have been playing with a few of these 1rpm synchronous motors: http://www.lusolarelectronics.com/small-ac-synchronous-motor-110v-ac-081rpm-torque-10kg-p-63.html I was hoping that when I plugged all of them into a power strip and flipped the switch, they would all start m...

Re: Newbie Father/Daughter Project Assistance

 by chartle ¦  Sat Jul 06, 2013 7:20 am ¦  Forum: SparkFun Product Questions ¦  Topic: Newbie Father/Daughter Project Assistance ¦  Replies: 4 ¦  Views: 745

For this project i think you are approaching it from the wrong direction. What will your daughter learn from attaching a "black box" the servo, to another black box, an arduino? Programming? I think you should start with something like knex. With knex she can start with a foundation of mechanics and...

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