navigator_io.py

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#!/usr/bin/python2

# Copyright (c) 2013-2014, Rethink Robotics
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the Rethink Robotics nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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import argparse
import sys

import rospy

import baxter_interface


def blink():
    navs = (
        baxter_interface.Navigator('left'),
        baxter_interface.Navigator('right'),
        baxter_interface.Navigator('torso_left'),
        baxter_interface.Navigator('torso_right'),)

    print ("Blinking LED's for 10 seconds")
    rate = rospy.Rate(10)
    i = 0
    while not rospy.is_shutdown() and i < 100:
        for nav in navs:
            nav.inner_led = not nav.inner_led
            nav.outer_led = not nav.outer_led
        rate.sleep()
        i += 1


def echo_input():
    def b0_pressed(v):
        print ("Button 0: %s" % (v,))

    def b1_pressed(v):
        print ("Button 1: %s" % (v,))

    def b2_pressed(v):
        print ("Button 2: %s" % (v,))

    def wheel_moved(v):
        print ("Wheel Increment: %d, New Value: %s" % (v, nav.wheel))

    nav = baxter_interface.Navigator('left')
    nav.button0_changed.connect(b0_pressed)
    nav.button1_changed.connect(b1_pressed)
    nav.button2_changed.connect(b2_pressed)
    nav.wheel_changed.connect(wheel_moved)

    print ("Press input buttons on the left navigator, "
           "input will be echoed here.")

    rate = rospy.Rate(1)
    i = 0
    while not rospy.is_shutdown() and i < 10:
        rate.sleep()
        i += 1


def main():
    """RSDK Navigator Input/Output Example

    Demonstrates Navigator output by blinking the lights, or
    Navigator input by echoing input values from wheels and
    buttons.

    Run this example, selecting either the input or output action
    with the corresponding arguments, then follow the instructions
    on screen.

    Uses the baxter_interface.Navigator class to interface with the
    four Navigator button/LED controls. Also shows a nice example of
    using the button_changed Signal feature.
    """
    arg_fmt = argparse.RawDescriptionHelpFormatter
    parser = argparse.ArgumentParser(formatter_class=arg_fmt,
                                     description=main.__doc__)
    action_grp = parser.add_mutually_exclusive_group(required=True)
    action_grp.add_argument(
        '-b', '--blink', dest='action', action='store_const', const=blink,
        help='Blink navigator lights for 10 seconds'
    )
    action_grp.add_argument(
        '-i', '--input', dest='action', action='store_const', const=echo_input,
        help='Show input of left arm for 10 seconds'
    )
    args = parser.parse_args(rospy.myargv()[1:])

    rospy.init_node('rsdk_navigator_io', anonymous=True)
    args.action()
    return 0

if __name__ == '__main__':
    sys.exit(main())