UPS Power Module

UPS Power Module UPS Power Module for Jetson Nano Developer Kit.

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Primary Attribute Category: {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

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Onboard Interfaces

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Introduction

UPS Power Module For Jetson Nano, 5V Uninterruptible Power Supply, Multi Battery Protection Circuits

Features

• I2C bus communication, monitoring the battery's voltage, current, power, and remaining capacity in real-time.
• 0.91" OLED for displaying info like battery voltage, IP address, RAM usage, etc.
• Multi battery protection circuits: overcharge/discharge protection, over current protection, short circuit protection, and reverse protection, along with the equalizing charge feature, are more safe and stable.
• Onboard 5V regulator, up to 2.5A continuous output current.
• Batteries warning indicators, easy to check if the battery is connected correctly.

Specifications

• Output Voltage: 5V
• Charger: 8.4V 2A
• Control bus: I2C
• Supported battery: 18650 Li battery (NOT included)
• Battery capacity: 4x batteries 10400mAh
• Dimension: 113mm × 79mm
• Mounting hole: 2.5mm

Hardware

The 8.4V interface is the charge port. You can plug the 8.4V 2A charger provided for charging the batteries.
The switched is the power switch, you can turn it into ON/OFF to turn on/off Jetson Nano Developer Kit
WARNING LED are the indicators of batteries, they turn on if you reverse batteries.
Note 1: Please check the WARNING LED when you mounting batteries, make sure that you set all the batteries in the correct way. You cannot charge batteries if you reverse them.
Note 2: The board may not work when you mount the batteries for the first time, you need to charge batteries on board for a while to activate them.
Note 3: Please use the charger provided, the module may be destroyed by other unsuitable power adapters/chargers.

SAFETY CAUTIONS

• Li-ion and Li-po batteries are quite unstable. They may cause fire, personal injury, or property damage, if they're not properly recharged or used.
• Do not reversely connect the polarities when recharging or discharging the battery. Do not use inferior charger/charging panel to recharge the battery.
• Do not mix use old batteries with new ones, avoid using batteries of different brands.
• When buying Lithium battery, should always make sure the battery specification is compatible with the expansion board. Choose batteries from formal manufacturer, and ensure the batteries will work stably and safely by aging test.
• Lithium batteries have limited cycle life, they will also deteriorate as time goes by. Should be replaced with new ones when the batteries reaching their max cycle life, or working over two years, whichever comes first.
• Should be placed carefully and properly, keep it away from inflammables and explosives articles, away from children, avoid any safety accident caused by careless storage.

How to use

You should connect the UPS Power Module with your Jetson Nano Developer Kit by the 6PIN cable. You should connect 5V to 5V, the 3.3V to 3.3V, otherwise, you may destroy the Jetson Nano Developer Kit because of the wrong connection.

Open a terminal and install the display code by the following command. The codes are used for display information on OLED like the voltage, current, etc.

sudo apt-get install python3-smbus -y
sudo apt-get install python-smbus -y
git clone https://github.com/waveshare/UPS-Power-Module
cd UPS-Power-Module
sudo ./install.sh

OLED will display the IP address, battery voltage, current, and the percentage of battery quantity, as well as the CPU, GPU, and memory information after starting the server.
Note: if the current value is negative, it means that the batteries are feeding the Jetson Nano Developer Kit. If the current value is positive, it means that the batteries are charging.


If you want to print the battery information to the terminal you can refer to the following script.

https://github.com/waveshare/UPS-Power-Module/blob/master/ups_display/ina219.py

The script can be run by the following command.

python3 -m ups_display.ina219

The information printed should be as below

Resources

Demo codes

• Demo codes

3D Drawing

• UPS Power Module 3D Drawing

Document

• Schematic
• INA219 Datasheet
• HY2120 Datasheet
• HY2213 Datasheet

FAQ

Question:The OLED of the UPS Power Module can not be displayed, you can run the following command to see if it can be displayed.

 Answer:

sudo python3 -m ups_display.display_server

If you can display the circuit by running this command, there is no problem. There should be a problem with the boot service, you can run the following two commands to uninstall and reinstall it.

sudo systemctl disable ups_display
sudo pip3 uninstall ups_display

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Question:How long will the UPS Power Module for Nano last?

 Answer:

Standby state, about 10-12 hours; other cases have not been specifically tested.

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Question:What is wrong with the UPS Power Module switch not responding when it is turned ON?

 Answer:

When reconnecting the battery, it needs to be connected to the power supply to work properly.

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Question:Can this battery keep max mode on NANO?

 Answer:

The module supports a maximum current of 2.5A and can be used in max mode.

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Question:About how long does it take to charge this module out of power?

 Answer:

Module power-off charging takes about four hours (the switch is on the OFF side).

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Support

If you require technical support, please go to the Support page and open a ticket.