MQTT - Joystick Bricklet¶

Simple¶

Download (example-simple.txt)

1# Change XYZ to the UID of your Joystick Bricklet
2
3setup:
4    # Get current position
5    subscribe to tinkerforge/response/joystick_bricklet/XYZ/get_position
6    publish '' to tinkerforge/request/joystick_bricklet/XYZ/get_position

Callback¶

Download (example-callback.txt)

 1# Change XYZ to the UID of your Joystick Bricklet
 2
 3setup:
 4    # Handle incoming pressed callbacks
 5    subscribe to tinkerforge/callback/joystick_bricklet/XYZ/pressed
 6    publish '{"register": true}' to tinkerforge/register/joystick_bricklet/XYZ/pressed # Register pressed callback
 7
 8    # Handle incoming released callbacks
 9    subscribe to tinkerforge/callback/joystick_bricklet/XYZ/released
10    publish '{"register": true}' to tinkerforge/register/joystick_bricklet/XYZ/released # Register released callback

Find Borders¶

Download (example-find-borders.txt)

 1# Change XYZ to the UID of your Joystick Bricklet
 2
 3setup:
 4    # Get threshold callbacks with a debounce time of 0.2 seconds (200ms)
 5    publish '{"debounce": 200}' to tinkerforge/request/joystick_bricklet/XYZ/set_debounce_period
 6
 7    # Handle incoming position reached callbacks
 8    subscribe to tinkerforge/callback/joystick_bricklet/XYZ/position_reached
 9        if a message arrives
10            # message contains x and y as int
11            if y == 100
12                print "Top"
13            elseif y == -100
14                print "Bottom"
15            endif
16
17            if x == 100
18                print "Right"
19            elseif x == -100
20                print "Left"
21            endif
22
23            print "\n"
24        endif
25    endsubscribe
26
27    publish '{"register": true}' to tinkerforge/register/joystick_bricklet/XYZ/position_reached # Register position_reached callback
28
29    # Configure threshold for position "outside of -99, -99 to 99, 99"
30    publish '{"option": "outside", "min_x": -99, "max_x": 99, "min_y": -99, "max_y": 99}' to tinkerforge/request/joystick_bricklet/XYZ/set_position_callback_threshold

Basic Functions¶

request/joystick_bricklet/<UID>/get_position¶

Request:	empty payload
Response:	x – Type: int, Range: [-100 to 100] y – Type: int, Range: [-100 to 100]

Returns the position of the joystick. The middle position of the joystick is x=0, y=0. The returned values are averaged and calibrated (see request/joystick_bricklet/<UID>/calibrate()).

If you want to get the position periodically, it is recommended to use the register/joystick_bricklet/<UID>/position() callback and set the period with request/joystick_bricklet/<UID>/set_position_callback_period().

request/joystick_bricklet/<UID>/is_pressed¶

Request:	empty payload
Response:	pressed – Type: bool

Returns true if the button is pressed and false otherwise.

It is recommended to use the register/joystick_bricklet/<UID>/pressed() and register/joystick_bricklet/<UID>/released() callbacks to handle the button.

Advanced Functions¶

request/joystick_bricklet/<UID>/get_analog_value¶

Request:	empty payload
Response:	x – Type: int, Range: [0 to 212 - 1] y – Type: int, Range: [0 to 212 - 1]

Returns the values as read by a 12-bit analog-to-digital converter.

Note

The values returned by request/joystick_bricklet/<UID>/get_position() are averaged over several samples to yield less noise, while request/joystick_bricklet/<UID>/get_analog_value() gives back raw unfiltered analog values. The only reason to use request/joystick_bricklet/<UID>/get_analog_value() is, if you need the full resolution of the analog-to-digital converter.

If you want the analog values periodically, it is recommended to use the register/joystick_bricklet/<UID>/analog_value() callback and set the period with request/joystick_bricklet/<UID>/set_analog_value_callback_period().

request/joystick_bricklet/<UID>/calibrate¶

Request:	empty payload
Response:	no response

Calibrates the middle position of the joystick. If your Joystick Bricklet does not return x=0 and y=0 in the middle position, call this function while the joystick is standing still in the middle position.

The resulting calibration will be saved on the EEPROM of the Joystick Bricklet, thus you only have to calibrate it once.

request/joystick_bricklet/<UID>/get_identity¶

Request:

empty payload

Response:

uid – Type: string, Length: up to 8 connected_uid – Type: string, Length: up to 8 position – Type: char, 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] _display_name – Type: string

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. If symbolic output is not disabled, the device identifier is mapped to the corresponding name in the format used in topics.

The display name contains the Joystick's name in a human readable form.

Callback Configuration Functions¶

request/joystick_bricklet/<UID>/set_position_callback_period¶

Request:	period – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0
Response:	no response

Sets the period with which the register/joystick_bricklet/<UID>/position() callback is triggered periodically. A value of 0 turns the callback off.

The register/joystick_bricklet/<UID>/position() callback is only triggered if the position has changed since the last triggering.

request/joystick_bricklet/<UID>/get_position_callback_period¶

Request:	empty payload
Response:	period – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0

Returns the period as set by request/joystick_bricklet/<UID>/set_position_callback_period().

request/joystick_bricklet/<UID>/set_analog_value_callback_period¶

Request:	period – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0
Response:	no response

Sets the period with which the register/joystick_bricklet/<UID>/analog_value() callback is triggered periodically. A value of 0 turns the callback off.

The register/joystick_bricklet/<UID>/analog_value() callback is only triggered if the analog values have changed since the last triggering.

request/joystick_bricklet/<UID>/get_analog_value_callback_period¶

Request:	empty payload
Response:	period – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0

Returns the period as set by request/joystick_bricklet/<UID>/set_analog_value_callback_period().

request/joystick_bricklet/<UID>/set_position_callback_threshold¶

Request:	option – Type: char, Range: See symbols, Default: "x" min_x – Type: int, Range: [-215 to 215 - 1], Default: 0 max_x – Type: int, Range: [-215 to 215 - 1], Default: 0 min_y – Type: int, Range: [-215 to 215 - 1], Default: 0 max_y – Type: int, Range: [-215 to 215 - 1], Default: 0
Response:	no response

Sets the thresholds for the register/joystick_bricklet/<UID>/position_reached() callback.

The following options are possible:

Option	Description
'x'	Callback is turned off
'o'	Callback is triggered when the position is outside the min and max values
'i'	Callback is triggered when the position is inside the min and max values
'<'	Callback is triggered when the position is smaller than the min values (max is ignored)
'>'	Callback is triggered when the position is greater than the min values (max is ignored)

The following symbols are available for this function:

For option:

• "off" = "x"

• "outside" = "o"

• "inside" = "i"

• "smaller" = "<"

• "greater" = ">"

request/joystick_bricklet/<UID>/get_position_callback_threshold¶

Request:	empty payload
Response:	option – Type: char, Range: See symbols, Default: "x" min_x – Type: int, Range: [-215 to 215 - 1], Default: 0 max_x – Type: int, Range: [-215 to 215 - 1], Default: 0 min_y – Type: int, Range: [-215 to 215 - 1], Default: 0 max_y – Type: int, Range: [-215 to 215 - 1], Default: 0

Returns the threshold as set by request/joystick_bricklet/<UID>/set_position_callback_threshold().

The following symbols are available for this function:

For option:

• "off" = "x"

• "outside" = "o"

• "inside" = "i"

• "smaller" = "<"

• "greater" = ">"

request/joystick_bricklet/<UID>/set_analog_value_callback_threshold¶

Request:	option – Type: char, Range: See symbols, Default: "x" min_x – Type: int, Range: [0 to 216 - 1], Default: 0 max_x – Type: int, Range: [0 to 216 - 1], Default: 0 min_y – Type: int, Range: [0 to 216 - 1], Default: 0 max_y – Type: int, Range: [0 to 216 - 1], Default: 0
Response:	no response

Sets the thresholds for the register/joystick_bricklet/<UID>/analog_value_reached() callback.

The following options are possible:

Option	Description
'x'	Callback is turned off
'o'	Callback is triggered when the analog values are outside the min and max values
'i'	Callback is triggered when the analog values are inside the min and max values
'<'	Callback is triggered when the analog values are smaller than the min values (max is ignored)
'>'	Callback is triggered when the analog values are greater than the min values (max is ignored)

The following symbols are available for this function:

For option:

• "off" = "x"

• "outside" = "o"

• "inside" = "i"

• "smaller" = "<"

• "greater" = ">"

request/joystick_bricklet/<UID>/get_analog_value_callback_threshold¶

Request:	empty payload
Response:	option – Type: char, Range: See symbols, Default: "x" min_x – Type: int, Range: [0 to 216 - 1], Default: 0 max_x – Type: int, Range: [0 to 216 - 1], Default: 0 min_y – Type: int, Range: [0 to 216 - 1], Default: 0 max_y – Type: int, Range: [0 to 216 - 1], Default: 0

Returns the threshold as set by request/joystick_bricklet/<UID>/set_analog_value_callback_threshold().

The following symbols are available for this function:

For option:

• "off" = "x"

• "outside" = "o"

• "inside" = "i"

• "smaller" = "<"

• "greater" = ">"

request/joystick_bricklet/<UID>/set_debounce_period¶

Request:	debounce – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100
Response:	no response

Sets the period with which the threshold callbacks

• register/joystick_bricklet/<UID>/position_reached(),

• register/joystick_bricklet/<UID>/analog_value_reached()

are triggered, if the thresholds

• request/joystick_bricklet/<UID>/set_position_callback_threshold(),

• request/joystick_bricklet/<UID>/set_analog_value_callback_threshold()

keep being reached.

request/joystick_bricklet/<UID>/get_debounce_period¶

Request:	empty payload
Response:	debounce – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100

Returns the debounce period as set by request/joystick_bricklet/<UID>/set_debounce_period().

Callbacks¶

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the corresponding .../register/... topic and an optional suffix. This suffix can be used to deregister the callback later.

register/joystick_bricklet/<UID>/position¶

Register Request:	register – Type: bool
Callback Response:	x – Type: int, Range: [-100 to 100] y – Type: int, Range: [-100 to 100]

A callback can be registered for this event by publishing to the .../register/joystick_bricklet/<UID>/position[/<SUFFIX>] topic with the payload "true". An added callback can be removed by publishing to the same topic with the payload "false". To support multiple (de)registrations, e.g. for message filtering, an optional suffix can be used.

If the callback is triggered, a message with it's payload is published under the corresponding .../callback/joystick_bricklet/<UID>/position[/<SUFFIX>] topic for each registered suffix.

This callback is triggered periodically with the period that is set by request/joystick_bricklet/<UID>/set_position_callback_period(). The callback payload is the position of the joystick.

The register/joystick_bricklet/<UID>/position() callback is only triggered if the position has changed since the last triggering.

register/joystick_bricklet/<UID>/analog_value¶

Register Request:	register – Type: bool
Callback Response:	x – Type: int, Range: [0 to 212 - 1] y – Type: int, Range: [0 to 212 - 1]

A callback can be registered for this event by publishing to the .../register/joystick_bricklet/<UID>/analog_value[/<SUFFIX>] topic with the payload "true". An added callback can be removed by publishing to the same topic with the payload "false". To support multiple (de)registrations, e.g. for message filtering, an optional suffix can be used.

If the callback is triggered, a message with it's payload is published under the corresponding .../callback/joystick_bricklet/<UID>/analog_value[/<SUFFIX>] topic for each registered suffix.

This callback is triggered periodically with the period that is set by request/joystick_bricklet/<UID>/set_analog_value_callback_period(). The callback payload members are the analog values of the joystick.

The register/joystick_bricklet/<UID>/analog_value() callback is only triggered if the values have changed since the last triggering.

register/joystick_bricklet/<UID>/position_reached¶

Register Request:	register – Type: bool
Callback Response:	x – Type: int, Range: [-100 to 100] y – Type: int, Range: [-100 to 100]

A callback can be registered for this event by publishing to the .../register/joystick_bricklet/<UID>/position_reached[/<SUFFIX>] topic with the payload "true". An added callback can be removed by publishing to the same topic with the payload "false". To support multiple (de)registrations, e.g. for message filtering, an optional suffix can be used.

If the callback is triggered, a message with it's payload is published under the corresponding .../callback/joystick_bricklet/<UID>/position_reached[/<SUFFIX>] topic for each registered suffix.

This callback is triggered when the threshold as set by request/joystick_bricklet/<UID>/set_position_callback_threshold() is reached. The callback payload members are the position of the joystick.

If the threshold keeps being reached, the callback is triggered periodically with the period as set by request/joystick_bricklet/<UID>/set_debounce_period().

register/joystick_bricklet/<UID>/analog_value_reached¶

Register Request:	register – Type: bool
Callback Response:	x – Type: int, Range: [0 to 212 - 1] y – Type: int, Range: [0 to 212 - 1]

A callback can be registered for this event by publishing to the .../register/joystick_bricklet/<UID>/analog_value_reached[/<SUFFIX>] topic with the payload "true". An added callback can be removed by publishing to the same topic with the payload "false". To support multiple (de)registrations, e.g. for message filtering, an optional suffix can be used.

If the callback is triggered, a message with it's payload is published under the corresponding .../callback/joystick_bricklet/<UID>/analog_value_reached[/<SUFFIX>] topic for each registered suffix.

This callback is triggered when the threshold as set by request/joystick_bricklet/<UID>/set_analog_value_callback_threshold() is reached. The callback payload members are the analog values of the joystick.

If the threshold keeps being reached, the callback is triggered periodically with the period as set by request/joystick_bricklet/<UID>/set_debounce_period().

register/joystick_bricklet/<UID>/pressed¶

Register Request:	register – Type: bool
Callback Response:	empty payload

A callback can be registered for this event by publishing to the .../register/joystick_bricklet/<UID>/pressed[/<SUFFIX>] topic with the payload "true". An added callback can be removed by publishing to the same topic with the payload "false". To support multiple (de)registrations, e.g. for message filtering, an optional suffix can be used.

If the callback is triggered, a message with it's payload is published under the corresponding .../callback/joystick_bricklet/<UID>/pressed[/<SUFFIX>] topic for each registered suffix.

This callback is triggered when the button is pressed.

register/joystick_bricklet/<UID>/released¶

Register Request:	register – Type: bool
Callback Response:	empty payload

A callback can be registered for this event by publishing to the .../register/joystick_bricklet/<UID>/released[/<SUFFIX>] topic with the payload "true". An added callback can be removed by publishing to the same topic with the payload "false". To support multiple (de)registrations, e.g. for message filtering, an optional suffix can be used.

If the callback is triggered, a message with it's payload is published under the corresponding .../callback/joystick_bricklet/<UID>/released[/<SUFFIX>] topic for each registered suffix.

This callback is triggered when the button is released.