Python - Segment Display 4x7 Bricklet¶

Simple¶

Download (example_simple.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 Segment Display 4x7 Bricklet
DIGITS = [0x3f,0x06,0x5b,0x4f,
          0x66,0x6d,0x7d,0x07,
          0x7f,0x6f,0x77,0x7c,
          0x39,0x5e,0x79,0x71] # // 0~9,A,b,C,d,E,F

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_segment_display_4x7 import BrickletSegmentDisplay4x7

if __name__ == "__main__":
    ipcon = IPConnection() # Create IP connection
    sd = BrickletSegmentDisplay4x7(UID, ipcon) # Create device object

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

    # Write "4223" to the display with full brightness without colon
    segments = (DIGITS[4], DIGITS[2], DIGITS[2], DIGITS[3])
    sd.set_segments(segments, 7, False)

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

Basic Functions¶

BrickletSegmentDisplay4x7(uid, ipcon)¶

Parameters:	uid – Type: str ipcon – Type: IPConnection
Returns:	segment_display_4x7 – Type: BrickletSegmentDisplay4x7

Creates an object with the unique device ID uid:

segment_display_4x7 = BrickletSegmentDisplay4x7("YOUR_DEVICE_UID", ipcon)

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

BrickletSegmentDisplay4x7.set_segments(segments, brightness, colon)¶

Parameters:	segments – Type: [int, ...], Length: 4, Range: [0 to 127] brightness – Type: int, Range: [0 to 7] colon – Type: bool
Returns:	None

The 7-segment display can be set with bitmaps. Every bit controls one segment:

For example to set a "5" you would want to activate segments 0, 2, 3, 5 and 6. This is represented by the number 0b01101101 = 0x6d = 109.

The brightness can be set between 0 (dark) and 7 (bright). The colon parameter turns the colon of the display on or off.

BrickletSegmentDisplay4x7.get_segments()¶

Return Object:	segments – Type: [int, ...], Length: 4, Range: [0 to 127] brightness – Type: int, Range: [0 to 7] colon – Type: bool

Returns the segment, brightness and color data as set by set_segments().

Advanced Functions¶

BrickletSegmentDisplay4x7.start_counter(value_from, value_to, increment, length)¶

Parameters:	value_from – Type: int, Range: [-999 to 9999] value_to – Type: int, Range: [-999 to 9999] increment – Type: int, Range: [-999 to 9999] length – Type: int, Unit: 1 ms, Range: [0 to 232 - 1]
Returns:	None

Starts a counter with the from value that counts to the to value with the each step incremented by increment. length is the pause between each increment.

Example: If you set from to 0, to to 100, increment to 1 and length to 1000, a counter that goes from 0 to 100 with one second pause between each increment will be started.

Using a negative increment allows to count backwards.

You can stop the counter at every time by calling set_segments().

BrickletSegmentDisplay4x7.get_counter_value()¶

Returns:	value – Type: int, Range: [-999 to 9999]

Returns the counter value that is currently shown on the display.

If there is no counter running a 0 will be returned.

BrickletSegmentDisplay4x7.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¶

BrickletSegmentDisplay4x7.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)

segment_display_4x7.register_callback(BrickletSegmentDisplay4x7.CALLBACK_EXAMPLE, my_callback)

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

BrickletSegmentDisplay4x7.CALLBACK_COUNTER_FINISHED¶

Callback Parameters:	no parameters

This callback is triggered when the counter (see start_counter()) is finished.

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.

BrickletSegmentDisplay4x7.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.

BrickletSegmentDisplay4x7.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:

• BrickletSegmentDisplay4x7.FUNCTION_SET_SEGMENTS = 1
• BrickletSegmentDisplay4x7.FUNCTION_START_COUNTER = 3

BrickletSegmentDisplay4x7.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:

• BrickletSegmentDisplay4x7.FUNCTION_SET_SEGMENTS = 1
• BrickletSegmentDisplay4x7.FUNCTION_START_COUNTER = 3

BrickletSegmentDisplay4x7.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¶

BrickletSegmentDisplay4x7.DEVICE_IDENTIFIER¶

This constant is used to identify a Segment Display 4x7 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.

BrickletSegmentDisplay4x7.DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a Segment Display 4x7 Bricklet.