The Digispark > Digispark Project Ideas

LiPower Sheild?

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yukivx:
I'm not familiar with Digispark. Therefore I try various studies now.

Probably Digispark works alone if there is a power supply. If Digispark can easily work with LiPo battery like LilyPad LiPower, I'm glad. It is because LiPo cells is very small. It's nice if Digispark uses the LiPower Sheild and allows you to charge 3.7V LiPo cells.

LilyPad LiPower
https://www.sparkfun.com/products/11260

LiPo charger
https://www.sparkfun.com/products/11231
http://www.seeedstudio.com/depot/lipo-rider-p-710.html

Polymer Lithium Ion Battery - 110mAh (Weight: 2.65g)
https://www.sparkfun.com/products/731

MichaelMeissner:
The digispark runs at 5v.  In theory, if you use the boost shield, it should allow you to connect a 3.7v battery, but be sure to check with others about the specs of the boost shield.

sparr:
One LiPo battery on a boost shield is an efficient but more complex option. Two LiPo batteries in series can use the onboard regulator directly.

yukivx:
Thank you sparr and MichaelMeissner,

I was able to understand it as a more complex options. I will buy two LiPo.

Bluebie:
Speaking speculatively, the microprocessor used in the DigiSpark can run on as little as 2.7 volts, and can easily be powered by a lipo battery or even a lithium button battery.  This is complicated a little by the clock speed, but if you set the OSCAL register to a lower value as soon as your program begins, it\'ll only be running out of spec for the duration of the bootloader. This leaves only one further potential complication - if the digispark team enable the brown-out detector, it might not work at these lower voltages. Hopefully if they do enable brown-out detection, they\'ll set it to 2.7v, though I\'d rather see brown out detection disabled entirely as it consumes a small amount of power when the device is asleep, shortening it\'s sleeping battery life - we\'ll see when the final devices start being delivered. :)

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