sonar_trigger_echo.ranger Class Reference

Public Member Functions
def	__init__ (self, pi, trigger, echo)
def	cancel (self)
def	read (self)

Public Attributes
	pi

Private Member Functions
def	_cbf (self, gpio, level, tick)

Private Attributes
	_cb
	_echo
	_echo_mode
	_high
	_inited
	_ping
	_time
	_trig
	_trig_mode
	_triggered

Detailed Description

This class encapsulates a type of acoustic ranger.  In particular
the type of ranger with separate trigger and echo pins.

A pulse on the trigger initiates the sonar ping and shortly
afterwards a sonar pulse is transmitted and the echo pin
goes high.  The echo pins stays high until a sonar echo is
received (or the response times-out).  The time between
the high and low edges indicates the sonar round trip time.

Definition at line 7 of file sonar_trigger_echo.py.

Constructor & Destructor Documentation

def sonar_trigger_echo.ranger.__init__	(		self,
			pi,
			trigger,
			echo
	)

The class is instantiated with the Pi to use and the
gpios connected to the trigger and echo pins.

Definition at line 19 of file sonar_trigger_echo.py.

Member Function Documentation

def sonar_trigger_echo.ranger._cbf (   self,   gpio,   level,   tick  )

private

Definition at line 45 of file sonar_trigger_echo.py.

def sonar_trigger_echo.ranger.cancel

(

self

)

Cancels the ranger and returns the gpios to their
original mode.

Definition at line 79 of file sonar_trigger_echo.py.

def sonar_trigger_echo.ranger.read

(

self

)

Triggers a reading.  The returned reading is the number
of microseconds for the sonar round-trip.

round trip cms = round trip time / 1000000.0 * 34030

Definition at line 60 of file sonar_trigger_echo.py.

Member Data Documentation

sonar_trigger_echo.ranger._cb

private

Definition at line 40 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._echo

private

Definition at line 26 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._echo_mode

private

Definition at line 35 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._high

private

Definition at line 29 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._inited

private

Definition at line 43 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._ping

private

Definition at line 28 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._time

private

Definition at line 30 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._trig

private

Definition at line 25 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._trig_mode

private

Definition at line 34 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger._triggered

private

Definition at line 32 of file sonar_trigger_echo.py.

sonar_trigger_echo.ranger.pi

Definition at line 24 of file sonar_trigger_echo.py.

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The documentation for this class was generated from the following file:

• sonar_trigger_echo.py