Template: UPS-HAT
Features
- Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
- I2C bus communication, monitoring the batteries voltage, current, power, and remaining capacity in real-time
- Multi battery protection circuits: overcharge/discharge protection, over current protection, short circuit protection, and reverse protection, along with the equalizing charge feature, more safe and stable
- Onboard 5V regulator, up to 2.5A continuous output current
- 5V USB output, convenient for powering other boards
- Batteries warning indicators, easy to check if the battery is connected correctly
Specifications
- Output voltage：5V
- Charger：8.4V 2A
- Control bus：I2C
- Battery supported：18650 Li battery (NOT included)
- Dimensions：56mm × 85mm
- Mounting hole：3.0mm
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 can just attach the UPS HAT on the 40PIN GPIO of Raspberry Pi or connect the i2c interface and to Raspberry Pi by wires. VCC should be connected to 3.3V
Open a terminal and run the following commands:
sudo apt-get install p7zip wget https://www.waveshare.com/w/upload/d/d9/UPS_HAT.7z 7zr x UPS_HAT.7z -r -o./UPS_HAT cd UPS_HAT python3 INA219.py
The terminal will print 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 Raspberry Pi. If the current value is positive, it means that the batteries are charging.