class Tinkerforge::BrickletSegmentDisplay4x7

Four 7-segment displays with switchable colon

Constants

CALLBACK_COUNTER_FINISHED

This callback is triggered when the counter (see BrickletSegmentDisplay4x7#start_counter) is finished.

Public Class Methods

new(uid, ipcon) click to toggle source

Creates an object with the unique device ID uid and adds it to the IP Connection ipcon.

Calls superclass method
# File lib/tinkerforge/bricklet_segment_display_4x7.rb, line 32
def initialize(uid, ipcon)
  super uid, ipcon, DEVICE_IDENTIFIER, DEVICE_DISPLAY_NAME

  @api_version = [2, 0, 0]

  @response_expected[FUNCTION_SET_SEGMENTS] = RESPONSE_EXPECTED_FALSE
  @response_expected[FUNCTION_GET_SEGMENTS] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_START_COUNTER] = RESPONSE_EXPECTED_FALSE
  @response_expected[FUNCTION_GET_COUNTER_VALUE] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_GET_IDENTITY] = RESPONSE_EXPECTED_ALWAYS_TRUE

  @callback_formats[CALLBACK_COUNTER_FINISHED] = [8, '']

  @ipcon.add_device self
end

Public Instance Methods

get_counter_value() click to toggle source

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

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

# File lib/tinkerforge/bricklet_segment_display_4x7.rb, line 95
def get_counter_value
  check_validity

  send_request FUNCTION_GET_COUNTER_VALUE, [], '', 10, 'S'
end
get_identity() click to toggle source

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 :ref:`Isolator Bricklet <isolator_bricklet>` is always at position 'z'.

The device identifier numbers can be found :ref:`here <device_identifier>`. |device_identifier_constant|

# File lib/tinkerforge/bricklet_segment_display_4x7.rb, line 111
def get_identity
  send_request FUNCTION_GET_IDENTITY, [], '', 33, 'Z8 Z8 k C3 C3 S'
end
get_segments() click to toggle source

Returns the segment, brightness and color data as set by BrickletSegmentDisplay4x7#set_segments.

# File lib/tinkerforge/bricklet_segment_display_4x7.rb, line 69
def get_segments
  check_validity

  send_request FUNCTION_GET_SEGMENTS, [], '', 14, 'C4 C ?'
end
register_callback(id, &block) click to toggle source

Registers a callback with ID id to the block block.

# File lib/tinkerforge/bricklet_segment_display_4x7.rb, line 116
def register_callback(id, &block)
  callback = block
  @registered_callbacks[id] = callback
end
set_segments(segments, brightness, colon) click to toggle source

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

.. image

/Images/Bricklets/bricklet_segment_display_4x7_bit_order.png

:scale: 100 %
:alt: Bit order of one segment
:align: center

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.

# File lib/tinkerforge/bricklet_segment_display_4x7.rb, line 61
def set_segments(segments, brightness, colon)
  check_validity

  send_request FUNCTION_SET_SEGMENTS, [segments, brightness, colon], 'C4 C ?', 8, ''
end
start_counter(value_from, value_to, increment, length) click to toggle source

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 BrickletSegmentDisplay4x7#set_segments.

# File lib/tinkerforge/bricklet_segment_display_4x7.rb, line 86
def start_counter(value_from, value_to, increment, length)
  check_validity

  send_request FUNCTION_START_COUNTER, [value_from, value_to, increment, length], 's s s L', 8, ''
end