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How to power Leonardo with LiPo
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

How to power Leonardo with LiPo

by jimwelty on Fri Feb 21, 2020 3:24 pm

Hi - What kind of LiPo do I need to power this Leonardo (attached pic) separately from the shield, probably though the 5v or VIN pins or preferably via the barrel connector? I need it to run continuously for about 4-5 days. Thanks! Jim

Botletics SIM7000 LTE CAT-M1 NB-IoT Cellular + GPS + Antenna Shield Kit for Arduino (SIM7000A)

Leonardo R3 ATmega32U4

IMG_2782.jpg
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Re: How to power Leonardo with LiPo

by adafruit_support_bill on Fri Feb 21, 2020 3:30 pm

The Leonardo is designed for 5v operation. It would probably work on 3.7v direct from the LiPo, but any analog readings would be affected.

For 5v from a LiPo, one of the PowerBoost boards would work. The PowerBoost 500 can supply plenty for the Leonardo. The 500C is similar, but has a built-in LiPo charging circuit.
https://www.adafruit.com/?q=powerboost

Assuming a 50mA drain rate for 5 days: 50mA * 120h = 6000mAh.
A 6600mAh pack should get you through 5 days: https://www.adafruit.com/product/353

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Re: How to power Leonardo with LiPo

by jimwelty on Fri Feb 21, 2020 3:38 pm

Awesome thanks! Can you link me directly to each of the exact components I need so I order the right things please? Thanks again

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Re: How to power Leonardo with LiPo

by adafruit_support_bill on Fri Feb 21, 2020 3:41 pm

Not sure if you need the charger or not for your application:
This is the basic PowerBoost (no charger): https://www.adafruit.com/product/1903
This is the PowerBoost with built-in charger: https://www.adafruit.com/product/1944

And here is the 6600mAh LiPo: https://www.adafruit.com/product/353

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Re: How to power Leonardo with LiPo

by jimwelty on Fri Feb 21, 2020 6:18 pm

Awesome, thanks. Forgive me, but I think a component to the app solution may be missing. I connect the LiPo to the charger, and the charger to the barrel jack of the Leonardo, right? So what cable to I need to link the charger to the barrel? Thanks

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Re: How to power Leonardo with LiPo

by adafruit_support_bill on Fri Feb 21, 2020 7:28 pm

You connect the Lipo to the PowerBoost via the JST connector.
And connect the PowerBoost to the Leonardo using a USB cable.
For the connection from your power supply to the PowerBoost, it depends on the output of your power supply. If it has a 2.1mm barrel connector, you can use one of these:
https://www.adafruit.com/product/368
And connect the output of that to the GND and USB pins on the PowerBoost.

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Re: How to power Leonardo with LiPo

by jimwelty on Sat Feb 22, 2020 7:31 pm

I like the PowerBoost 500 Shield - Rechargeable 5V Power Shield (https://www.adafruit.com/product/2078) and presume it can used for this application with the Lithium Ion Battery Pack - 3.7V 6600mAh (https://www.adafruit.com/product/353) and stacked on top of the Botletics SIM7000 shield? If it can all work, any idea when the shield might be back in stock? Thanks.

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Re: How to power Leonardo with LiPo

by adafruit_support_bill on Sun Feb 23, 2020 8:20 am

That combination should work. We don't have a firm date for when it will be back in stock. It depends on the delivery of components from suppliers. But if you sign up for notifications, you will get an email as soon as they are available again.

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Re: How to power Leonardo with LiPo

by jimwelty on Fri Mar 06, 2020 12:30 pm

Hi - because of all the Powershield backorders, I went ahead and ordered the PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost @ 500mA+ (ORDER #2271333-3712269157). Does it come with the USB port part shown in the pic below?

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Re: How to power Leonardo with LiPo

by adafruit_support_bill on Fri Mar 06, 2020 1:36 pm

Yes. The USB jack is part of the kit.

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Re: How to power Leonardo with LiPo

by jimwelty on Thu Mar 26, 2020 11:36 am

Hi - so, the solution appears to be working and the device has run continuously for 12 hours for the first time! My question is... is this a function of the larger battery or is the PowerBoost doing something to prolong battery life? In other words, what exactly is the PowerShield 500 (non-recharging) doing? (Pic attached)
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Re: How to power Leonardo with LiPo

by adafruit_support_bill on Thu Mar 26, 2020 12:31 pm

Any increase in run-time is probably due to a larger battery. The PowerBoost is boosting the battery voltage from about 3.7v to 5v. Since the laws of physics don't allow for any free lunches, any increase in voltage equates to a proportional decrease in current. And, since the conversion is not 100% efficient, there is some power lost to heat as well. Roughly speaking, for every amp of output, you will need about 1.5 amps of input from your battery.

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