This package demonstrates how Docassemble can be integrated with the Raspberry Pi, using a Christmas-themed interview, a red LED, and a green LED. See a video of the interview in action

Use a Raspberry Pi with at least 4GB of RAM.

Connect pin 23 to the positive end of a green LED.
Connect the negative end of the LED to a 220 ohm resistor, and connect the other end of the resistor to ground (pin 22 or pin 25).

Do the same for pin 24, except use a red LED.

The idea is that 5 volts on pin 23 or 24 will cause current to flow through the LED.

Install Docker on the Raspberry Pi and grant access to the user pi:

sudo apt-get -y install docker.io
sudo usermod -a -G docker pi

You might need to restart the Raspberry Pi after doing usermod in order to ensure that the user pi can run Docker commands.

Since the standard images are not built for the ARM architecture, you need to build them yourself.

git clone https://github.com/jhpyle/docassemble-os
cd docassemble-os
docker build -t jhpyle/docassemble-os .
cd ..
git clone https://github.com/jhpyle/docassemble
cd docassemble
docker build -t jhpyle/docassemble .
cd ..

This will take several hours.

Then create a Docassemble container that has privileged access:

docker run --privileged --restart=always --stop-timeout=600 -d -p 80:80 --env DAPYTHONVERSION=3 jhpyle/docassemble

Next, docker exec inside of the container.

Give the user www-user (inside the container) access to /dev/gpiomem. On the Raspberry Pi host, the owner of this file is root and the group is gpio. But the group gpio does not exist inside the container. When you do ls -l /dev/gpiomem inside the container, you will likely see that the "group" for the file is a number, like 997. It might be something else for you. You need to add the user www-data to that group so that the Docassemble web application can access the GPIO pins of the Raspberry Pi. But if the group is a number, you can't add the user to the group, so first create the group, and then add www-data to it:

addgroup --gid 997 gpio
addgroup www-data gpio

Then restart the services:

supervisorctl start reset

Because the processor is underpowered, things can take a very long time. check supervisorctl status to see what is happening, and be patient.