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Topic: Battery instead of USB? (Read 1 time) previous topic - next topic

Awesome_Guy

Is using an AAA battery connected to the TinkerKit inputs instead of connecting it to a PC, or Mac going to work with my Esplora Board?
The Herobrine

Runaway Pancake

An AAA battery?  
Well..., put it this way:
A battery pack of AAAs would work - or of whichever cells you like is fine - provided that's not greater than "5V" (or not greater than VUSBMAX.)

"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!

Awesome_Guy

How many would there have to be in the pack? Five? Six? Twenty?
The Herobrine

Runaway Pancake

How many would there have to be in the pack? Five? Six? Twenty?
Yes, right, twenty.

If we're talking about alkaline AA, AAA, C, D cells (batteries), they're 1.5V each.
NiMH, NiCd are 1.2V or so each.
What to do, which to use, depends on what's to be accomplished.
With a "boost converter" and two AA batteries, you can get a lot of run time (I have.)
Be sure that the battery (external power) is disconnected from the Esplora whenever you have the Esplora connected to the computer.
http://www.ebay.com/itm/121142828799
"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!

Isaac96

Does the Esplora have a regulator?/
Do not PM me for help.Only links to topics.
CONNECT THE GROUNDS!

After Tuesday, even the calendar goes W T F

Runaway Pancake

No, no on-board regulator; the plan was for the esplora-folk to stay tethered to the USB, happy to do game controllers and so on.
Maybe some of the stuff onboard gets a down-regulated voltage, but the "5V" is all straight USB.
"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!

Isaac96

Probably 3 AA batteries would be good. There is probably a 3.3V regulator on board for some things as Runaway Pancake said, and it might not work correctly at 3V.
Do not PM me for help.Only links to topics.
CONNECT THE GROUNDS!

After Tuesday, even the calendar goes W T F

Runaway Pancake

#7
May 15, 2016, 11:44 pm Last Edit: May 16, 2016, 12:06 am by Runaway Pancake
There's probably nobody keeping up, but I've been doing some work with this because I picked up a TFT.



The Esplora temp_sensor IC seems sensitive to "V_in".

My test for the TFT was the temp_sensor / thermometer sketch, something meaningful with no extra parts needed.  I was using a lab supply set to 5V and then connected it to one of the little step-up converters I mentioned and my temp readings were about 4 degs F lower with it.  (Incr. V_in → decr. temp reading).  The step-up's O/P is 5.1V  The temp_sensor IC runs from 5V directly.

I have, definitely, ohmmed the pins out and the USB 5V pin is 0_ohms to the Tinkerkit 5V pins (and Gnd is Gnd).

> > > It's NOT the temp_sensor IC; it's stable. It's the ADC, its reference.
"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!

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