Introduction

PowerBulb connects a Smart Trainer to a Smart Lightbulb (e.g. LIFX) using ANT and a Raspberry Pi.

Video

Hardware Requirements

1. Smart Trainer, Power Meter or HR monitor
2. Raspberry Pi + Squeeze
3. ANT+ USB Dongle (e.g. Dynastream ANTUSB-m)
4. LIFX Smart Bulb

Software Installation

ANT+ Adapter

Configure a udev rule for the ANT+ adapter so to create a serial USB device.

Create a file at sudo vi /etc/udev/rules.d/garmin-ant2.rules containing the following line:

SUBSYSTEM=="usb", ATTRS{idVendor}=="0fcf", ATTRS{idProduct}=="1009", RUN+="/sbin/modprobe usbserial vendor=0x0fcf product=0x1009", MODE="0666", OWNER="pi", GROUP="root"

Note that depending on your specific adapter, idVendor and idProduct might need changing. Check your device using dmesg | grep usb.

Application (Raspberry Pi)

Run the following commands to install the Python requirements in a virtual environment:

$ sudo apt-get install libncurses5-dev
$ pip install virtualenv
$ python -m virtualenv venv
$ source venv/bin/activate
$ pip install -r requirements_pi.txt
$ git submodule update --init ext/python-ant
$ cd ext/python-ant
$ python setup.py install
$ cd ../../

Running

You can start running by using:

$ python app.py -c config.json

Generating a FTP Color Map

PowerBulb uses a map of power (W) or heart rate (BPM) to color (HSBK). The default map (colors/ftp.json) is based on a Functional Threshold Power (FTP) of 225W.

You can generate a new color map based on your own FTP using the following command:

$ python create_ftp_color_map.py --ftp 320 --output colors/ftp.json --kind discrete

The colors match Zwift: Z1 (gray), Z2 (blue), Z3 (green), Z4 (yellow), Z5 (orange), Z6 (red).

Note: If you'd rather use heart rate, use create_hr_color_map.py instead and edit config.json to point at the new file.

Configuration

The application configuration is stored in config.json in the root of the repository.

The contents of the file should be as follows:

{
    "device": {
        "path": "/dev/ttyUSB0", 
        "type": "power", 
        "number": 0
    }, 
    "bulb": {
        "ip": "192.168.254.50", 
        "mac": "d0:73:d5:21:5c:6d"
    }, 
    "color_map": "colors/ftp.json"
}

The configuration can be customized as follows:

device

Path	Description
path	The USB/serial ANT+ device
type	The device type (can be power or hr)
number	The device number (can be 0 for all devices)

bulb

Path	Description
ip	The IP address of the LIFX bulb
mac	The physical address of the LIFX bulb

color_map

Path	Description
color_map	The path to the JSON file containing to value -> color map

Using supervisord

You can deamonize the application and detach it from the terminal using supervisord. This will continually run the application and restart it if no device is found.

$ supervisord -c supervisord.conf
$ supervisorctl status
app                              RUNNING   pid 3773, uptime 0:00:25

Other Utilities

• sweep_color_map.py -c config.json -min 50 -max 500 (test the color map and sweep a W range)
• find_lifx_devices.py (dumps LIFX color lights on the LAN)

Development Environment

A conda environment file is provided that can be used to create a development environment.

$ conda env create -n powerbulb -f environment.yaml
$ pushd ext/python-ant
$ python setup.py install
$ popd
...
$ python app.py -c config.json