June 07, 2018

KH 385: Lithium Powered, UPS Raspberry Pi Case - LiPi: A self-contained, battery powered Raspberry Pi NUC

1 hour 7 minutes

The Raspberry Pi is an amazing device that can be everything from a server to a game machine, but have you ever wanted to have a self-contained, portable unit? Or maybe a server NUC with a built-in uninterruptible Power Supply?

On this episode of Know How, Patrick and Padre take you through the steps of creating a "LiPi" which can give you up to 12 hours of power for your RasPi while also acting as an auto-switching UPS that can run on 6-26 volts!

Project Summary:

We've done several RasPi projects this year that could bennefit from an independent power source. (The TorPi, the Pi-Hole, The RetroPi) -- We want to create a power system that can act BOTH as a power system AND an uninterruptible power system.

Project Requirements:

Must have a way to power the RasPi WITHOUT using the USB connector

Must have a way to switch from line power to battery power AND BACK without disrupting operation.

Must have a way to turn OFF power completely (to prevent draining the battery pack)

Must operate or more than 3 hours

NUC sized

Should have a way to gracefully power-down the Pi

Must have a way to swap the SD card without dissasembly

LiPi Parts

Raspberry Pi 3 ~$35

5V UBEC (Hobbywing - Accepts 5.5 - 26V) ~$3

3 x 18650 LiPo Cells (3800mAh) ~$8

5.5MM x 2.1mm DC Power Jack ~$1

Rocker Switch ~$12

Momentary Switch ~$5.59

Lithium Ion Battery Charger w/Protection ~$1

JST Connectors ~$0.60

Walkera Connectors (x 3) ~$0.40

Total: ~$51

Power Calculations:

~5 Watt/Hours

Each Cell can provide (3800 x 3.7 = ) ~14 Watt/Hours

We have ~42 Watt/Hours of capacity

But we don't run down all the way... 30% is when the protection circuit will kick in.

So we should count on 29 Watt hours of USABLE power

29 / 5 = Just under 6 hours AT FULL POWER

Shutting down WiFi/Bluetooth and not pegging 100% power should give us close to 8 hours.

The 3D design can be found at the following link:

https://www.tinkercad.com/things/dStBlNXSDlK#/

Hosts: Fr. Robert Ballecer, SJ and Patrick Delahanty

Connect with us!

Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.

Join our Google+ Community.

Tweet at us at @PadreSJ and @PDelahanty.

Thanks to CacheFly for the bandwidth for this show.

Sponsors:

Ring.com/KNOWHOW

eero.com code KNOWHOW

...more

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By TWiT

4.5

3535 ratings

June 07, 2018

KH 385: Lithium Powered, UPS Raspberry Pi Case - LiPi: A self-contained, battery powered Raspberry Pi NUC

1 hour 7 minutes

Project Summary:

Project Requirements:

Must have a way to power the RasPi WITHOUT using the USB connector

Must have a way to switch from line power to battery power AND BACK without disrupting operation.

Must have a way to turn OFF power completely (to prevent draining the battery pack)

Must operate or more than 3 hours

NUC sized

Should have a way to gracefully power-down the Pi

Must have a way to swap the SD card without dissasembly

LiPi Parts

Raspberry Pi 3 ~$35

5V UBEC (Hobbywing - Accepts 5.5 - 26V) ~$3

3 x 18650 LiPo Cells (3800mAh) ~$8

5.5MM x 2.1mm DC Power Jack ~$1

Rocker Switch ~$12

Momentary Switch ~$5.59

Lithium Ion Battery Charger w/Protection ~$1

JST Connectors ~$0.60

Walkera Connectors (x 3) ~$0.40

Total: ~$51

Power Calculations:

~5 Watt/Hours

Each Cell can provide (3800 x 3.7 = ) ~14 Watt/Hours

We have ~42 Watt/Hours of capacity

But we don't run down all the way... 30% is when the protection circuit will kick in.

So we should count on 29 Watt hours of USABLE power

29 / 5 = Just under 6 hours AT FULL POWER

Shutting down WiFi/Bluetooth and not pegging 100% power should give us close to 8 hours.

The 3D design can be found at the following link:

https://www.tinkercad.com/things/dStBlNXSDlK#/

Hosts: Fr. Robert Ballecer, SJ and Patrick Delahanty

Connect with us!

Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.

Join our Google+ Community.

Tweet at us at @PadreSJ and @PDelahanty.

Thanks to CacheFly for the bandwidth for this show.

Sponsors:

Ring.com/KNOWHOW

eero.com code KNOWHOW

...more

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KH 385: Lithium Powered, UPS Raspberry Pi Case - LiPi: A self-contained, battery powered Raspberry Pi NUC

KH 385: Lithium Powered, UPS Raspberry Pi Case - LiPi: A self-contained, battery powered Raspberry Pi NUC

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