def init():
"""
Initialize sonar object.
"""
global front, front_right, right, back_right, back, back_left, left, front_left, pinger, speed_timer
front = MaxSonarEZPulseWidth(robotmap.sonar.front_channel, inch)
front_right = MaxSonarEZPulseWidth(robotmap.sonar.front_right_channel, inch)
right = MaxSonarEZPulseWidth(robotmap.sonar.right_channel, inch)
back_right = MaxSonarEZPulseWidth(robotmap.sonar.back_right_channel, inch)
back = HRLVMaxSonarEZPulseWidth(robotmap.sonar.back_channel, inch)
back_left = MaxSonarEZPulseWidth(robotmap.sonar.back_left_channel, inch)
left = MaxSonarEZPulseWidth(robotmap.sonar.left_channel, inch)
front_left = MaxSonarEZPulseWidth(robotmap.sonar.front_left_channel, inch)
pinger = DigitalOutput(robotmap.sonar.pinger_channel)
speed_timer.start()
ping_timer.start()
