JuiceBox Zero lets you power a Raspberry Pi Zero with a Li-Ion or Li-Poly battery. The following will help you understand JuiceBox Zero and how to use it.
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Board Specs and features
- Uses any single cell Li-Ion or Li-Poly battery (3.7/4.2V) with a JST brand PH connector (pay attention to polarity)
This is a 1 Amp source
- It can source 1 Amp to the 5 Volt output and charge the battery at 1 Amp, so it can draw up to 2 Amps total from your micro-USB supply.
- Specifically designed for the Pi Camera, but can be used for any sensor or breakout board that doesn’t stack nicely onto a Pi.
Low battery GPIO trigger
- Use the code at the end of this guide to safely shut down your Pi when the battery reaches 3.2V
- Default GPIO is 16, but you can cut the trace between the pads and make a solder bridge on the GPIO 25 pads too!
- GPIO is digital LOW or 0 until the battery voltage reaches 3.2V, then it goes HIGH or 1.
Micro USB charging
- Make sure your power supply can source at least 2A.
- Do not plug the micro USB power cable into the Pi Zero power port or damage could occur to either board.
- Red (LOW1) = Low battery
- Yellow (CHRG1) = Charging
- Green (CHRG2) = Fully charged
- Blue (PWR1) = Power switch is ON
Tools and supplies needed
- Stacking header
- JuceBox Zero
- Standoffs (match the height of your stacking header!)
- Raspberry Pi Zero (or Zero W)
- Soldering stuff (i.e. Iron, solder, etc.)
- Battery (not needed for assembly, but you’ll need it eventually!)
- Put stacking header on Raspberry Pi Zero
- This will help keep it in place because soldering is definitely a two-handed job.
- Put some standoffs into the Pi Zero.
- Two are probably sufficient, but there’s nothing wrong with using four.
- Place the JuiceBox Zero onto the header and fasten down with screws.
- Be careful to not bend your Pi or JuiceBox if the headers aren’t the exact same height as the standoffs!
- Solder the header to the JuiceBox Zero.
Done! – “You are now free to move about the cabin.”
- Follow the guide in the next section to see how to use JuiceBox Zero.
How to Use JuiceBox Zero
- Plug in a Li-Ion battery that has a JST connector.
- Watch polarity, and only single cell batteries, please.
- Turn the Power switch to the “ON” position.
- A blue LED (marked PWR1) should light up.
- To charge the battery and/or run the Pi Zero off a micro-USB, plug a micro-USB cable into the JuiceBox Zero’s charge port.
- When JuiceBox Zero is connected to a micro-USB cable, the yellow charging LED will light up.
- Important: Do not connect power to the Pi Zero power port while JuiceBox Zero is connected, this could damage either your Pi Zero or JuiceBox Zero!
- Another note: make sure your charger is 2A capable.
Correct way to power your Pi with a JuiceBox Zero and a USB cable.
If you plug your USB into the Pi port, expect to let out the magic smoke. DON’T DO THIS.