Python - Motion Detector Bricklet¶

Callback¶

Download (example_callback.py)

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

HOST = "localhost"
PORT = 4223
UID = "XYZ" # Change XYZ to the UID of your Motion Detector Bricklet

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_motion_detector import BrickletMotionDetector

# Callback function for motion detected callback
def cb_motion_detected():
    print("Motion Detected")

# Callback function for detection cycle ended callback
def cb_detection_cycle_ended():
    print("Detection Cycle Ended (next detection possible in ~3 seconds)")

if __name__ == "__main__":
    ipcon = IPConnection() # Create IP connection
    md = BrickletMotionDetector(UID, ipcon) # Create device object

    ipcon.connect(HOST, PORT) # Connect to brickd
    # Don't use device before ipcon is connected

    # Register motion detected callback to function cb_motion_detected
    md.register_callback(md.CALLBACK_MOTION_DETECTED, cb_motion_detected)

    # Register detection cycle ended callback to function cb_detection_cycle_ended
    md.register_callback(md.CALLBACK_DETECTION_CYCLE_ENDED, cb_detection_cycle_ended)

    input("Press key to exit\n") # Use raw_input() in Python 2
    ipcon.disconnect()

Basic Functions¶

BrickletMotionDetector(uid, ipcon)¶

Parameters:	uid – Type: str ipcon – Type: IPConnection
Returns:	motion_detector – Type: BrickletMotionDetector

Creates an object with the unique device ID uid:

motion_detector = BrickletMotionDetector("YOUR_DEVICE_UID", ipcon)

This object can then be used after the IP Connection is connected.

BrickletMotionDetector.get_motion_detected()¶

Returns:	motion – Type: int, Range: See constants

Returns 1 if a motion was detected. How long this returns 1 after a motion was detected can be adjusted with one of the small potentiometers on the Motion Detector Bricklet, see here.

There is also a blue LED on the Bricklet that is on as long as the Bricklet is in the "motion detected" state.

The following constants are available for this function:

For motion:

• BrickletMotionDetector.MOTION_NOT_DETECTED = 0
• BrickletMotionDetector.MOTION_DETECTED = 1

Advanced Functions¶

BrickletMotionDetector.set_status_led_config(config)¶

Parameters:	config – Type: int, Range: See constants, Default: 2
Returns:	None

Sets the status led configuration.

By default the status LED turns on if a motion is detected and off is no motion is detected.

You can also turn the LED permanently on/off.

The following constants are available for this function:

For config:

• BrickletMotionDetector.STATUS_LED_CONFIG_OFF = 0
• BrickletMotionDetector.STATUS_LED_CONFIG_ON = 1
• BrickletMotionDetector.STATUS_LED_CONFIG_SHOW_STATUS = 2

New in version 2.0.1 (Plugin).

BrickletMotionDetector.get_status_led_config()¶

Returns:	config – Type: int, Range: See constants, Default: 2

Returns the configuration as set by set_status_led_config().

The following constants are available for this function:

For config:

• BrickletMotionDetector.STATUS_LED_CONFIG_OFF = 0
• BrickletMotionDetector.STATUS_LED_CONFIG_ON = 1
• BrickletMotionDetector.STATUS_LED_CONFIG_SHOW_STATUS = 2

New in version 2.0.1 (Plugin).

BrickletMotionDetector.get_identity()¶

Return Object:

uid – Type: str, Length: up to 8 connected_uid – Type: str, Length: up to 8 position – Type: chr, Range: ["a" to "h", "z"] hardware_version – Type: [int, ...], Length: 3 0: major – Type: int, Range: [0 to 255] 1: minor – Type: int, Range: [0 to 255] 2: revision – Type: int, Range: [0 to 255] firmware_version – Type: [int, ...], Length: 3 0: major – Type: int, Range: [0 to 255] 1: minor – Type: int, Range: [0 to 255] 2: revision – Type: int, Range: [0 to 255] device_identifier – Type: int, Range: [0 to 216 - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions¶

BrickletMotionDetector.register_callback(callback_id, function)¶

Parameters:	callback_id – Type: int function – Type: callable
Returns:	None

Registers the given function with the given callback_id.

The available callback IDs with corresponding function signatures are listed below.

Callbacks¶

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the register_callback() function of the device object. The first parameter is the callback ID and the second parameter the callback function:

def my_callback(param):
    print(param)

motion_detector.register_callback(BrickletMotionDetector.CALLBACK_EXAMPLE, my_callback)

The available constants with inherent number and type of parameters are described below.

BrickletMotionDetector.CALLBACK_MOTION_DETECTED¶

Callback Parameters:	no parameters

This callback is called after a motion was detected.

BrickletMotionDetector.CALLBACK_DETECTION_CYCLE_ENDED¶

Callback Parameters:	no parameters

This callback is called when the detection cycle ended. When this callback is called, a new motion can be detected again after approximately 2 seconds.

Virtual Functions¶

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

BrickletMotionDetector.get_api_version()¶

Return Object:	api_version – Type: [int, ...], Length: 3 0: major – Type: int, Range: [0 to 255] 1: minor – Type: int, Range: [0 to 255] 2: revision – Type: int, Range: [0 to 255]

Returns the version of the API definition implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

BrickletMotionDetector.get_response_expected(function_id)¶

Parameters:	function_id – Type: int, Range: See constants
Returns:	response_expected – Type: bool

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by set_response_expected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

• BrickletMotionDetector.FUNCTION_SET_STATUS_LED_CONFIG = 4

BrickletMotionDetector.set_response_expected(function_id, response_expected)¶

Parameters:	function_id – Type: int, Range: See constants response_expected – Type: bool
Returns:	None

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

• BrickletMotionDetector.FUNCTION_SET_STATUS_LED_CONFIG = 4

BrickletMotionDetector.set_response_expected_all(response_expected)¶

Parameters:	response_expected – Type: bool
Returns:	None

Changes the response expected flag for all setter and callback configuration functions of this device at once.

Constants¶

BrickletMotionDetector.DEVICE_IDENTIFIER¶

This constant is used to identify a Motion Detector Bricklet.

The get_identity() function and the IPConnection.CALLBACK_ENUMERATE callback of the IP Connection have a device_identifier parameter to specify the Brick's or Bricklet's type.

BrickletMotionDetector.DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a Motion Detector Bricklet.