Python library to program Luos based robots.
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README.md

Pyluos

Build Status

Pyluos lets you easily connect, interact and program your luos based robots.

The API was designed to be as simple as possible and let you focus on bringing life to your ideas!

You can find more information on luos on https://www.luos.io.

Install Pyluos

From pypi (master branch):

pip install pyluos

Or clone from git:

git clone http://github.com/pollen-robotics/pyluos.git

Compatibility

Pyluos is a pure-python library and works with Python >= 2.7 or 3.4 and later.

Quickstart

Pyluos API was designed to be as simple as possible so you can directly focus on the application you want to make!

Connecting

Connecting to your robot is really easy. It actually takes only two lines of code.

On WiFi

from pyluos import Robot

robot = Robot('my_robot_hostname.local')

On serial

from pyluos import Robot

robot = Robot('my_serial_port')

If you don't know how to find the name of the usb/wifi gate you are using, you can report to the section Finding a gate.

Accessing values

Once connected the robot is automatically synced at a high frequency. You can list the plugged modules via:

print(robot.modules)

>>> [<Motor alias="motor_1" id=2 state=90>,
     <Motor alias="motor_2" id=3 state=90>,
     <Distance alias="distance_sensor_1" id=4 state=6>]

Or access the current value of a sensor directly:

print(robot.distance_sensor_1.distance)

>>> 45

Sending commands

You can send command value to the effectors in a similar way.

robot.motor_1.position = 45
robot.led.color = (0, 255, 0)

The orders are in fact buffered and are actually sent a very short time after (few ms).

Linking sensor and effector in a loop

You can also transparently link sensors and effectors (even from different robots) together.

For instance, the following code will change the color of the led to red when there is something near the distance sensor and change it to blue otherwise:

while True:
  if robot.dist_sensor.distance < 50:
    robot.led.color = (255, 0, 0)
  else:
    robot.led.color = (0, 0, 255)

Available module

L0 GPIO

Read - Input Pins:

  • p1 (analog input as u16)
  • p8 (digital input high/low)
  • p9 (digital input high/low)
  • p10 (digital input high/low)
  • p11 (digital input high/low)
  • p12 (analog input as u16)

Write - Output Pins:

  • p2 (digital output high/low)
  • p3 (digital output high/low)
  • p4 (digital output high/low)

Button

Read:

  • state (possible value 'ON' or 'OFF')

Potentiometer

Read:

  • position (in degrees)

Coming soon

Distance

Read:

  • distance (value in mm)

Dynamixel Motor

Read:

  • position (in degrees)

Write:

  • target_position (in degrees)
  • target_speed (maximum reachable speed in degrees per second)
  • compliant (True/False set the motor in compliant or stiff mode)
  • wheel (True/False set the motor in wheel or joint mode)

RGB Led

Write:

  • color (R, G, B) channels. Each channel must be in [0, 255]

Relay

Method:

  • on()
  • off()

Servo

Write:

  • target_position (in degrees)

Stepper

Read:

  • position (in mm)

Write:

  • target_position (in mm)
  • target_speed (in mm/s)

Method:

  • home()
  • stop()

Finding a gate

If you don't know the name of a gate, you can easily find it using the pyluos-usb-gate and pyluos-wifi-gate command line utilities.

There should be automatically installed when you install pyluos. They should be available in your path. From the terminal, you can run:

pyluos-wifi-gate discover

This will show the name of the wifi gate connected on the same WiFi. This uses the Zeroconf protocol.

Make sure to use either the IP or the hostname.local for WiFi gates.

Similarly, to find the name of the USB gate connected to your machine you can run: pyluos-usb-gate discover

You can then uses the found name to connect to it via pyluos:

from pyluos import Robot
robot = Robot('/dev/cu.usbmodem2964691')

Module Hotplug

At the moment, pyluos does not support module hotplug. If you connect to a Robot and add a new module, they will not be automatically added to your Python object.

You will need to unplug the whole bus and re-power it.

This may be made automatic in future versions.

Luos gate external API

If you want to connect your robot to other services, you can directly use its API. This JSON API is served either via the serial communication or via a websocket for the WiFi module.

The robot publish its state at a predefined frequency (currently about 25Hz). The state looks like:

{
  "modules": [
    {
      "alias": "my_wifi_gate",
      "id": 1,
      "type": "gate"
    },
    {
      "alias": "my_button",
      "id": 2,
      "type": "button",
      "value": 1
    },
    {
      "alias": "my_left_arm",
      "id": 3,
      "type": "servo",
    }
  ]
}

You can also send commands using:

{
  "modules": {
    "my_led": {
      "color": [0, 255, 0]
    },
    "my_servo": {
      "target_position": 45
    }
  }
}

You can find the list of all available registers in the modules section.

Warning: you should not flood the robot with commands as the gates are not protected against this at the moment. They will simply crash and reboot. Pyluos for instance limits the push of commands to about the same frequency as it gets update from the robot (~25Hz).

Contributing

Pyluos was developed by the Pollen Robotics team as part of Luos.

Pyluos still needs lots of usage and testing to help it become more useful and reliable. If you are actively using Pyluos, have suggestion or comments please let us know!

Do not hesitate to share your experience with Pyluos our meet other luos users on our forum!

License

Pyluos is licensed under the MIT license.