Picroft

Picroft is a ready-made way to run Mycroft on a Raspberry Pi 3, 3B+ or 4 and is provided as a disk image that you can burn to a Micro SD card.

Note as at 2022-11-11: The official Picroft image is not currently being actively maintained as our teams attention is firmly on the Mark II at the moment. Picroft is intended as a DIY development platform and requires basic knowledge of Linux and the commandline. If you need support with your Picroft please post in the Community Forums or Chat. Mycroft cannot provide technical support for Picroft and other DIY projects.

Quick links

• Picroft stable disk image

• Picroft unstable disk image

• enclosure-picroft repo on GitHub

• Picroft topic on the Mycroft Community Forum

• Picroft chatroom in Mycroft Chat

About Picroft

Picroft is based on Raspbian Buster Lite.

Picroft is entirely open source, and PRs and Issues are warmly welcomed on the Picroft GitHub repo.

What do I need to run Picroft?

In order to set up Picroft, you will need to have a basic understanding of the Linux (Raspbian) command line, be comfortable connecting devices to WiFi networks, and have a little patience when setting up audio devices.

Hardware requirements and compatibility chart

Model	Level of support
Pi4	Supported
Pi3 B+	Supported
Pi3 B	Supported
Pi 2	Functions very slowly, limited wifi support
Pi B	Not supported
Pi A+	Not supported
Pi Zero, Zero W, Zero WH	Not supported

As well as a Raspberry Pi, you will also need:

• Micro SD card, 8GB or larger highly recommended

• Power adapter with micro USB for your country. The Raspberry Pi Foundation has some excellent recommendations.

• An analog Speaker that can be plugged into the 3.5mm audio jack on the RPi or a USB Speaker (Bluetooth on Picroft is difficult to get working and is not recommended)

• USB Microphone

Installing Picroft may be easier if you also have:

• USB keyboard

• Monitor or TV connected via HDMI cable

• Ethernet cable (if not connecting via WiFi)

Tested hardware

The following is a Community maintained list of hardware that has been used with Picroft. Whilst every effort is made to keep this list updated, upstream software changes may cause future problems with device compatibility. Mycroft can not guarantee that any specific hardware will work with Picroft.

If you are looking for a low-cost option to try out Picroft, we can recommend the PlayStation Eye (often called a PS3 Eye).

Brand	Model	Status	Type	Notes
Adafruit	Voice Bonnet for RPi	Working	Multi-mic hat	specific configuration required
AmazonBasics	LJ-USM-001	Working	USB Conference Microphone
Andrea Electronics	C1-1028100-3	Working	USB Dongle (Mic array & Speaker 3.5mm)	Superbeam Array Microphone Bundle SUMA (08a8:0016)
Blue	Snowball iCE	Working	Microphone
Creative	VF0790	Working	Mic and camera
Google	AIY v1	Working	Mic and speaker
Jabra	Speak 410	Problems reported	Mic and speaker	Premium microphone and speaker combination
Logitech	C270	Working	Mic and camera
Logitech	C525	Working	Mic and camera
Logitech	Webcam Pro 9000	Working	Mic and camera
Logitech	Z50	Working	Speaker
Matrix	Voice	Working	Mic array
PlayStation	Eye (PS3 Eye)	Working	Mic and camera	An excellent introductory model if you are just checking Picroft out.
Seeed Studio	Mic Array 2.0	Working	Mic array	Premium microphone array
YOTTO	B08VD5JZJD	Working	Mic	360° Omnidirectional Conference Mic

If you experience any audio problems, please see the Audio Troubleshooting Guide.

Audio Troubleshooting

Adafruit Voice Bonnet

Community members have reported some minor modifications that are required for this device to function.

In the file /etc/pulse/default.pa, uncomment or add the following lines:

load-module module-alsa-sink
load-module module-alsa-source device=hw:1,0
set-default-sink alsa_output.platform-soc_sound.stereo-fallback
set-default-source alsa_input.hw_1_0

Bluetooth devices

Bluetooth audio devices are notoriously difficult and are not supported by default. At the time of writing, this thread on the Community Forums is a good starting point.

If you have had success using Bluetooth devices with Picroft please contribute your experience and help us update this documentation for a more positive wireless future.

Getting started with Picroft

Downloading the disk image

First, download the Picroft disk image.

We also have a Picroft disk image available of our unstable branch if desired.

Burn the disk image to the Micro SD card

Next, the disk image needs to be burnt to the Micro SD card.

The Raspberry Pi official documentation provides an excellent tutorial on this.

If you prefer to use the Linux command line tool dd to burn the disk image instead, follow these instructions:

1. Download the Picroft disk image

2. Insert the Micro SD card you wish to burn the image to. It must have a storage capacity of 8GB or higher.

3. Identify the path where the MicroSD card is mounted by running the command sudo fdisk -l. You will be able to tell the path based on the storage size of the device.

4. Keep a note of this - it will be something like /dev/sdb. If you are not 100% sure about which disk you are flashing, safely eject the disk and rerun the command to make sure it is no longer reported by fdisk. Performing the following operations will delete the entire contents of the disk.

5. Unmount all partitions on that disk so that no other operation can write to the device while it is being imaged using the command sudo umount /dev/sdb*. Make sure to substitute for the location of your device.

6. Run the command sudo dd if=path-to-your-image.img of=/dev/sdb bs=20M. Make sure to substitute the path to the .img file you downloaded, and the location of your device.

7. This will take several minutes to run. The command prompt will return if successful, otherwise an error message will be displayed on your terminal.

Seeing the output from Picroft

There are two ways to see the output from a Picroft Device:

1. Plug Picroft into a HDMI monitor or television, and attach a USB keyboard. If you are planning to connect Picroft to a WiFi network, you will first need to connect to a HDMI monitor or television so that you can manually configure Picroft's WiFi settings.

2. ssh into Picroft once Picroft is connected to a wired or wireless network

Connecting Picroft to a keyboard and monitor

If you would like to see the output of Picroft on a monitor (rather than SSH'ing in to Picroft), you can plug a HDMI monitor in to the HDMI slot on the Raspberry Pi.

If you would like to connect a keyboard or mouse (rather than SSH'ing in to Picroft), connect them via the USB slots on the Raspberry Pi.

In our experience, we've found most monitors, keyboards and mice are plug-and-play - ie. you shouldn't have to install any additional drivers.

Booting up Picroft

Once you've burned the disk image to the Micro SD card, insert the Micro SD card into the Micro SD card slot on the Raspberry Pi. Plug in your microphone, speakers, and if you're using a monitor and/or keyboard, plug these in too.

Next, plug in the power and connect the Micro USB cable to the RPi. This "power on" the device.

If you have a HDMI monitor connected, you should start to see some output on screen.

If you're going to ssh into Picroft, do the following:

ssh into Picroft

SSH access to Picroft is enabled by default, so you don't have to enable SSH access.

• Ensure you know the IP address of your Picroft Device on your network. If your Picroft is already paired, then a handy way to do this is to install the IP Address Skill, and then Speak:

Hey Mycroft, what's your IP address?

"here are my available IP addresses: wlan IP address ... Those are all my available IP addresses"

If not, you will need to know what IP address your Picroft has. You may need to log in to your router to find out the IP address of your Picroft.

• Open up your favorite terminal program, like PuTTy on Windows, or a new terminal on Linux

• ssh pi@IPADDRESS

• The default password is mycroft, so enter this when prompted.

• If you have successfully logged in via SSH you will see a command prompt like the one below:

$ ssh pi@192.168.0.13                 <-- in this case, the IP address was 192.168.0.13, your IP address may vary
pi@192.168.0.13's password:

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Wed Oct 18 13:02:44 2017
pi@mark_1:~ $

You are now connected to Picroft via SSH.

Setting up Picroft

On first boot, you will see a screen which looks similar to the one below:

Picroft initial boot screen

Picroft will then ask you whether you would like to do the guided setup, or drop straight to a command line. If you are new to Picroft, we recommend that you complete the guided setup.

Selecting audio output and audio input

NOTE: Audio output and audio input is the single most problematic part of Picroft setup; we've tried to provide lots of guidance here to get you up and running, but you may need to experiment to find a solution for your chosen audio output and input devices.

The guided setup will then ask you to select your audio output device, as shown below:

Picroft select audio output

Enter the number 1, 2, 3 or 4 corresponding to:

1) Speakers via 3.5mm output (aka 'audio jack' or 'headphone jack')
2) HDMI audio (e.g. a TV or monitor with built-in speakers)
3) USB audio (e.g. a USB soundcard or USB mic/speaker combo)
4) Google AIY Voice HAT and microphone board (Voice Kit v1)

Next, test and adjust the volume. You may need to reboot your Picroft in order for the audio output device to be correctly selected.

The final step of the guided setup is microphone configuration. You will be asked to select your audio input device, as shown below:

Picroft select audio input

Enter the number 1, 2, 3 or 4 corresponding to:

1) PlayStation Eye (USB)
2) Blue Snoball ICE (USB)
3) Google AIY Voice HAT and microphone board (Voice Kit v1)
4) Matrix Voice HAT.
5) Other (unsupported -- good luck!)

The guided setup will then do a microphone test to ensure your chosen microphone is working OK.

What can I do if the guided setup doesn't set my audio input or output device correctly?

If you experience any audio problems, please see the Audio Troubleshooting Guide.

Audio Troubleshooting

Pairing the Picroft

Once the Picroft is connected to the internet, and you have run through the guided setup, Picroft will reboot. Picroft will boot into the mycroft-cli-client screen, and a Registration Code will be spoken, and will also be shown on the mycroft-cli-client screen, as shown below:

Picroft pairing

View the home.mycroft.ai documentation to learn how to add your Device to home.mycroft.ai.

Once paired, you can then use basic Skills to get started. For example, you can ask questions like 'Tell me about Abraham Lincoln' - shown below:

Picroft basic commands

Connecting Picroft to a wired or WiFi network

To connect to a wired network

Simply plug the ethernet cable into the RJ45 (ethernet) socket on the RPi. Picroft will then attempt to connect to the network, and request a DHCP address.

You will need to connect to your router, or use other networking diagnostics, to identify what IP address your Picroft has been allocated on the network.

To connect to a WiFi network

By default, Picroft is not configured for WiFi. Picroft can connect to most 2.4GHz WiFi networks, but this has to be manually configured.

First, you need to be able to edit files on the filesystem of the Picroft. There are two ways to do this.

1. Plug the Picroft into a keyboard and HDMI monitor then type Ctrl + C to get to the command line or

2. if you are already connected using a wired connection and you know the Picroft's IP address, SSH in to the Picroft device

Editing the wpa_supplicant.conf file

Next, we edit the wpa_supplicant.conf file. This file controls WiFi connections for the Raspberry Pi.

1. Type sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

2. Using the down arrow key, navigate to the bottom of the file, and add credentials for your SSID. You may also need to add the relevant two-character country code.

    country=US
    network={
            ssid="MyNetworkSSID"
            psk="mypassword"
    }

1. Type Ctrl + X to exit and Y then Enter to save your changes.

2. Type sudo reboot now

You will need to connect to your router, or use other networking diagnostics, to identify what IP address your Picroft has been allocated on the network.

Manually configuring WPA2 Enterprise WiFi with MSCHAPV2 authentication

If you are on an enterprise network, your network security might use WPA2 with MSCHAPV2 authentication. Configuring Picroft to use MSCHAPV2 is similar to the above, but requires some additional steps.

First, we need to generate a hash of your SSID's password.

echo -n your_password| iconv -t utf16le | openssl md4

This will use the NTLM hash which is a 16 bit MD4 hash. Make sure to copy this as we will need it for later steps.

Next, run the following commands:

cd /etc/wpa_supplicant
sudo nano wpa_supplicant.conf

Add the following to the bottom of the wpa_supplicant.conf file, replacing ssid with your SSID name, identity with your username and password with the hash generated earlier. Type Ctrl + O to save, then Ctrl + x to exit.

network={
    ssid="ssid network name"
    priority=1
    proto=RSN
    key_mgmt=WPA-EAP
    pairwise=CCMP
    auth_alg=OPEN
    eap=PEAP
    identity="user_name"
    password=hash:hash_key_here
    phase1="peaplabel=0"
    phase2="auth=MSCHAPV2"
}

Next, reboot the Picroft using sudo reboot now. If these steps have worked, you will be connected to your enterprise WiFi shortly after rebooting.

You will need to connect to your router, or use other networking diagnostics, to identify what IP address your Picroft has been allocated on the network.

Known errors with Picroft and WiFi

NOTE: Picroft cannot connect to WiFi networks that operate in the 5GHz band. You must select a WiFi network that operates in the 2.4GHz band.

NOTE: Picroft cannot connect to WiFi networks that operate on Channels 12 or 13 (2467MHz and 2472MHz frequencies). Please configure your SSID to use a different channel or frequency. These channels are often used in Germany and other European countries.

Next steps

Congratulations! You now have a fully functional Picroft, and can start exploring all the options you now have. Consider using it as a stand-alone voice assistant, or connect it to a monitor and keyboard, and develop straight away. If you don't have a monitor and keyboard, SSH is enabled by default so you can remotely connect to it straight away.

Picroft uses a Raspbian Stretch Lite image under the hood - with Mycroft pre-installed - so everything you can do with Raspbian, you can do with Picroft. You can download other packages, get it running as a server - or more!

For more help or ideas, consider joining our Picroft channel on Mycroft Chat or reading through our Picroft topic on the Mycroft Forum.

Useful commands for Picroft

There are several commands that are packaged into Picroft to help you with advanced functionality:

• mycroft-cli-client: This command will start the Mycroft CLI client if you are on the Linux command line

• mycroft-help: This command brings up help information

• mycroft-mic-test: This command re-runs the microphone test from the guided setup

• mycroft-msk: This command runs the Mycroft Skills Kit

• mycroft-msm: This command runs the Mycroft Skills Manager

• mycroft-pip: This command runs pip within the Mycroft Python virtual environment (venv). This is useful if you are installing dependencies for Skills.

• mycroft-say-to: This command sends a command to Picroft, just like you had 'spoken' a command. This is useful if your microphone is not working.

• mycroft-setup-wizard: This command re-runs the guided setup

• mycroft-skill-testrunner: This command runs the testrunner - used to run unit tests for a Skill. This is useful if you are doing Skills development with Mycroft

• mycroft-speak: This command gets Mycroft to 'speak' using Text to Speech.

• mycroft-venv-deactivate: This command deactivates the Mycroft Python virtual environment and is useful if you want to install other software on the Picroft device.

• mycroft-wipe: This command wipes Picroft back to factory default status. This will unpair the device and remove any configuration changes you have made.

Important file locations for Picroft

If you plan to do Skills development work, or other development work with Picroft, you'll find knowing these file locations useful.

• Skills - have a shortcut in /home/pi that points to /opt/mycroft/skills

• mycroft-core - is located at /home/pi/mycroft-core

• Logs - are located at /var/log/mycroft/

• mycroft.conf - is located at /home/mycroft/.mycroft/mycroft.conf

• Identity file (do not share) - is located at /home/mycroft/.mycroft/identity/identity2.json

Maintaining your Picroft

How to reimage a Picroft Device

To reimage a Picroft Device, download the latest disk image. Burn that to a MicroSD card using a tool like the Raspberry Pi Imager, and insert the burned MicroSD card into the Raspberry Pi, then connect the Raspberry Pi to power.

Keeping your Picroft updated

To keep mycroft-core and the Skills on your Picroft updated, first ssh in to Picroft, then run the update.sh script:

(.venv) pi@picroft:~ $ bash update.sh

This script will update both mycroft-core and the Skills on your Picroft device.

Building your own Picroft image

The Picroft image building instructions can now be found on GitHub at; https://github.com/MycroftAI/enclosure-picroft/blob/stretch/image_recipe.md

Using the GPIO pins on the Raspberry Pi

One common question we get is - "Can I use the general purpose input output pins (GPIO) on the Raspberry Pi with Picroft?".

The answer is 'Yes' - but this requires some additional configuration.

You need to add the pi user to the gpio group with the command

sudo usermod -g gpio pi

You also need to install some additional packages:

sudo apt-get install python-rpi.gpio && sudo apt-get install python3-rpi.gpio

This example GPIO Skill provides some good examples of how to use GPIO input and output in your Mycroft Skill.