Frequently Asked Questions

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    We've compiled a list of FAQ with their answers that you can reference. If there's anything that you think is missing, let us know!

    Frequently Asked Questions

    How do I charge Zumi?
    Plug your MicroUSB into the USB port on your red Zumi board and check to see that the blue LED turns on. This indicates that Zumi has detected USB power, and then you can switch Zumi into the “off” or “charging” position. A red LED will indicate that Zumi is charging.

    Why am I getting errors when trying to use the camera?
    Check that the camera cable is connected to the RaspberryPi. Sometimes it can become disconnected. On the camera itself, the smaller cable (“Sunny connector”) may also pop off. Gently push these back into place and try again.
    *Edit: When using the camera, make sure you not only create the camera object but initialize and close the stream:

    from import Camera
    camera = Camera()
    # Take pictures or run other code here
    camera.close() # Make sure to close the stream to prevent an error when reopening the stream.


    How do I check Zumi’s battery level?
    Call zumi.check_battery_voltage() in any Jupyter Notebook cell. Anything above 3.8 volts is sufficiently charged. If the voltage drops below 3.45V, charge immediately. It will also appear at the beginning of the boot sequence.

    Why won’t my Zumi power on?
    If you turn the switch on but the green LED flashes momentarily, Zumi may need a jumpstart! Use your Micro USB to power Zumi on. Wait until the initial boot sequence is completed, and then you can turn on the switch. It might be a good idea to leave Zumi in charge mode for now.

    My Zumi powered on, but why can’t she wake up?
    If you turn on the switch but you see Zumi’s x-eyes, the SD card may be missing or corrupted. If the SD card is corrupted, follow these steps to reflash your SD card. If you see these eyes while you are programming Zumi, you may have clicked the reset button on the red Zumi board. No need to worry, you can still program Zumi!

    What do the different color LEDs on Zumi mean?
    Zumi has 3 LEDs visible on the left side of the Zumi board. These are indicators of the charging state.
    If the RED LED is on, the battery is charging.
    If the BLUE LED is on, Micro USB power has been detected.
    If the GREEN LED is on, the Zumi board is being powered.
    If only the GREEN LED is on, then Zumi is running on battery power.
    If BLUE, RED, GREEN are all on, Zumi is charging and being powered by the USB cable.

    Why isn’t Zumi driving straight?
    If Zumi is being used for a long time, the gyroscope can get warm, and that will affect the readings. In your code, call zumi.mpu.calibrate() before your commands. Zumi should be on a flat surface while calibrating.

    Why won’t Zumi stop driving?
    Sometimes Zumi receives interfering commands and she gets stuck doing the last command, even after you stop running your code. If this happens, there are two ways you can try to get out of this state:
    Terminate the current cell that is running and call zumi.hard_brake() in another cell.
    Press the reset button on the red Zumi board.

    Why can’t I connect to WiFi?
    If Zumi cannot connect to your network the first time, it may not have communicated information in time. If the connection fails after multiple attempts, your network may not be stable or you are trying to connect to a captive network (like a coffee shop or airport). Leave a message on our forum if you are consistently not able to get online.

    Why is there a “domain error” when using
    If you are trying to access and you are getting an error, verify that you are connected to your Zumi network and not your local network. This error will also appear if you are on a machine that has a wired connection to the network. If you are having trouble accessing Zumi through this domain, try connecting through the hostname. For example, if you have “zumi1234”, search for “zumi1234.local” in your browser.

    How can I ssh into Zumi?
    The hostname for your Zumi is “zumi1234” (replace with your 4-digit id) and the password is “pi”. You can open a terminal session in Jupyter Notebook from the home page on Jupyter where you can find all of the lessons. Make sure to select “Terminal”.

    How do I stream video?
    Drive Mode is still under construction, but you can take pictures and learn how to take video in the “How does Zumi see?” lesson.

    I’m a hobbyist! How can I add extra sensors?
    Though we don’t provide any documentation or support for adding your own sensors, the Zumi board has 3.3V I2C access on the right side and UART on the left side (labeled J4 and J6 respectively) that are available to you. Make sure that whatever component you choose does not draw a lot of current.

    How and where do I write my own code?
    You can open a new Jupyter Notebook from the home page on Jupyter where you can find all of the lessons. Make sure to select “Python3”.

    How do I get extra parts?
    You can order extra parts using the links below:

    OLED Screen
    Raspberry Pi Zero (PiShop or Adafruit)
    PiCamera + Ribbon Cable

    If you need a Zumi board, fastener box, or motors, you can order those on Shopify:

    Zumi Board
    Fastener Box

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