This is the description of the Delphi/Lazarus API bindings for the Temperature IR Bricklet. General information and technical specifications for the Temperature IR Bricklet are summarized in its hardware description.
An installation guide for the Delphi/Lazarus API bindings is part of their general description.
The example code below is Public Domain (CC0 1.0).
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | program ExampleSimple;
{$ifdef MSWINDOWS}{$apptype CONSOLE}{$endif}
{$ifdef FPC}{$mode OBJFPC}{$H+}{$endif}
uses
SysUtils, IPConnection, BrickletTemperatureIR;
type
TExample = class
private
ipcon: TIPConnection;
tir: TBrickletTemperatureIR;
public
procedure Execute;
end;
const
HOST = 'localhost';
PORT = 4223;
UID = '365'; { Change to your UID }
var
e: TExample;
procedure TExample.Execute;
var obj, amb: smallint;
begin
{ Create IP connection }
ipcon := TIPConnection.Create;
{ Create device object }
tir := TBrickletTemperatureIR.Create(UID, ipcon);
{ Connect to brickd }
ipcon.Connect(HOST, PORT);
{ Don't use device before ipcon is connected }
{ Get current ambient and object temperatures (unit is °C/10) }
obj := tir.GetObjectTemperature;
amb := tir.GetAmbientTemperature;
WriteLn(Format('Object Temperature: %f °C', [obj/10.0]));
WriteLn(Format('Ambient Temperature: %f °C', [amb/10.0]));
WriteLn('Press key to exit');
ReadLn;
ipcon.Destroy; { Calls ipcon.Disconnect internally }
end;
begin
e := TExample.Create;
e.Execute;
e.Destroy;
end.
|
Download (ExampleWaterBoiling.pas)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | program ExampleWaterBoiling;
{$ifdef MSWINDOWS}{$apptype CONSOLE}{$endif}
{$ifdef FPC}{$mode OBJFPC}{$H+}{$endif}
uses
Math, SysUtils, IPConnection, BrickletTemperatureIR;
type
TExample = class
private
ipcon: TIPConnection;
tir: TBrickletTemperatureIR;
public
procedure ReachedCB(sender: TBrickletTemperatureIR; const temperature: smallint);
procedure Execute;
end;
const
HOST = 'localhost';
PORT = 4223;
UID = '365'; { Change to your UID }
var
e: TExample;
{ Callback for object temperature greater than 100 °C
(parameter has unit °C/10) }
procedure TExample.ReachedCB(sender: TBrickletTemperatureIR; const temperature: smallint);
begin
WriteLn(Format('The surface has a temperature of %f °C', [temperature/10.0]));
WriteLn('The water is boiling!');
end;
procedure TExample.Execute;
begin
{ Create IP connection }
ipcon := TIPConnection.Create;
{ Create device object }
tir := TBrickletTemperatureIR.Create(UID, ipcon);
{ Connect to brickd }
ipcon.Connect(HOST, PORT);
{ Don't use device before ipcon is connected }
{ Set emissivity to 0.98 (emissivity of water) }
tir.SetEmissivity(Floor($FFFF*0.98));
{ Get threshold callbacks with a debounce time of 10 seconds (10000ms) }
tir.SetDebouncePeriod(10000);
{ Register threshold reached callback to procedure ReachedCB }
tir.OnObjectTemperatureReached := {$ifdef FPC}@{$endif}ReachedCB;
{ Configure threshold for "greater than 100 °C" (unit is °C/10) }
tir.SetObjectTemperatureCallbackThreshold('>', 100*10, 0);
WriteLn('Press key to exit');
ReadLn;
ipcon.Destroy; { Calls ipcon.Disconnect internally }
end;
begin
e := TExample.Create;
e.Execute;
e.Destroy;
end.
|
Download (ExampleCallback.pas)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | program ExampleCallback;
{$ifdef MSWINDOWS}{$apptype CONSOLE}{$endif}
{$ifdef FPC}{$mode OBJFPC}{$H+}{$endif}
uses
SysUtils, IPConnection, BrickletTemperatureIR;
type
TExample = class
private
ipcon: TIPConnection;
tir: TBrickletTemperatureIR;
public
procedure ObjectTemperatureCB(sender: TBrickletTemperatureIR; const temperature: smallint);
procedure AmbientTemperatureCB(sender: TBrickletTemperatureIR; const temperature: smallint);
procedure Execute;
end;
const
HOST = 'localhost';
PORT = 4223;
UID = '365'; { Change to your UID }
var
e: TExample;
{ Callback functions for object/ambient temperature callbacks
(parameters have unit °C/10) }
procedure TExample.ObjectTemperatureCB(sender: TBrickletTemperatureIR; const temperature: smallint);
begin
WriteLn(Format('Object Temperature: %f °C', [temperature/10.0]));
end;
procedure TExample.AmbientTemperatureCB(sender: TBrickletTemperatureIR; const temperature: smallint);
begin
WriteLn(Format('Ambient Temperature: %f °C', [temperature/10.0]));
end;
procedure TExample.Execute;
begin
{ Create IP connection }
ipcon := TIPConnection.Create;
{ Create device object }
tir := TBrickletTemperatureIR.Create(UID, ipcon);
{ Connect to brickd }
ipcon.Connect(HOST, PORT);
{ Don't use device before ipcon is connected }
{ Set Period for temperature callbacks to 1s (1000ms)
Note: The callbacks are only called every second if the
value has changed since the last call! }
tir.SetObjectTemperatureCallbackPeriod(1000);
tir.SetAmbientTemperatureCallbackPeriod(1000);
{ Register object temperature callback to procedure ObjectTemperatureCB }
tir.OnObjectTemperature := {$ifdef FPC}@{$endif}ObjectTemperatureCB;
{ Register ambient temperature callback to procedure AmbientTemperatureCB }
tir.OnAmbientTemperature := {$ifdef FPC}@{$endif}AmbientTemperatureCB;
WriteLn('Press key to exit');
ReadLn;
ipcon.Destroy; { Calls ipcon.Disconnect internally }
end;
begin
e := TExample.Create;
e.Execute;
e.Destroy;
end.
|
Since Delphi does not support multiple return values directly, we use the out keyword to return multiple values from a function.
All functions and procedures listed below are thread-safe.
Creates an object with the unique device ID uid:
temperatureIR := TBrickletTemperatureIR.Create('YOUR_DEVICE_UID', ipcon);
This object can then be used after the IP Connection is connected (see examples above).
Returns the ambient temperature of the sensor. The value has a range of -400 to 1250 and is given in °C/10, e.g. a value of 423 means that an ambient temperature of 42.3 °C is measured.
If you want to get the ambient temperature periodically, it is recommended to use the callback OnAmbientTemperature and set the period with SetAmbientTemperatureCallbackPeriod.
Returns the object temperature of the sensor, i.e. the temperature of the surface of the object the sensor is aimed at. The value has a range of -700 to 3800 and is given in °C/10, e.g. a value of 3001 means that a temperature of 300.1 °C is measured on the surface of the object.
The temperature of different materials is dependent on their emissivity. The emissivity of the material can be set with SetEmissivity.
If you want to get the object temperature periodically, it is recommended to use the callback OnObjectTemperature and set the period with SetObjectTemperatureCallbackPeriod.
Sets the emissivity that is used to calculate the surface temperature as returned by GetObjectTemperature.
The emissivity is usually given as a value between 0.0 and 1.0. A list of emissivities of different materials can be found here.
The parameter of SetEmissivity has to be given with a factor of 65535 (16-bit). For example: An emissivity of 0.1 can be set with the value 6553, an emissivity of 0.5 with the value 32767 and so on.
Note
If you need a precise measurement for the object temperature, it is absolutely crucial that you also provide a precise emissivity.
The default emissivity is 1.0 (value of 65535) and the minimum emissivity the sensor can handle is 0.1 (value of 6553).
Returns the emissivity as set by SetEmissivity.
Returns the version of the API definition (major, minor, revision) 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.
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 SetResponseExpected. 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 send and errors are silently ignored, because they cannot be detected.
See SetResponseExpected for the list of function ID constants available for this function.
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 and callbacks it is always disabled.
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 send and errors are silently ignored, because they cannot be detected.
The following function ID constants are available for this function:
Changes the response expected flag for all setter and callback configuration functions of this device at once.
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' or 'd'.
The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.
Sets the period in ms with which the OnAmbientTemperature callback is triggered periodically. A value of 0 turns the callback off.
OnAmbientTemperature is only triggered if the temperature has changed since the last triggering.
The default value is 0.
Returns the period as set by SetAmbientTemperatureCallbackPeriod.
Sets the period in ms with which the OnObjectTemperature callback is triggered periodically. A value of 0 turns the callback off.
OnObjectTemperature is only triggered if the temperature has changed since the last triggering.
The default value is 0.
Returns the period as set by SetObjectTemperatureCallbackPeriod.
Sets the thresholds for the OnAmbientTemperatureReached callback.
The following options are possible:
Option | Description |
---|---|
'x' | Callback is turned off |
'o' | Callback is triggered when the ambient temperature is outside the min and max values |
'i' | Callback is triggered when the ambient temperature is inside the min and max values |
'<' | Callback is triggered when the ambient temperature is smaller than the min value (max is ignored) |
'>' | Callback is triggered when the ambient temperature is greater than the min value (max is ignored) |
The default value is ('x', 0, 0).
The following constants are available for this function:
Returns the threshold as set by SetAmbientTemperatureCallbackThreshold.
The following constants are available for this function:
Sets the thresholds for the OnObjectTemperatureReached callback.
The following options are possible:
Option | Description |
---|---|
'x' | Callback is turned off |
'o' | Callback is triggered when the object temperature is outside the min and max values |
'i' | Callback is triggered when the object temperature is inside the min and max values |
'<' | Callback is triggered when the object temperature is smaller than the min value (max is ignored) |
'>' | Callback is triggered when the object temperature is greater than the min value (max is ignored) |
The default value is ('x', 0, 0).
The following constants are available for this function:
Returns the threshold as set by SetObjectTemperatureCallbackThreshold.
The following constants are available for this function:
Sets the period in ms with which the threshold callbacks
are triggered, if the thresholds
keep being reached.
The default value is 100.
Returns the debounce period as set by SetDebouncePeriod.
Callbacks can be registered to receive time critical or recurring data from the device. The registration is done by assigning a procedure to an callback property of the device object:
procedure TExample.MyCallback(sender: TBrickletTemperatureIR; const param: word); begin WriteLn(param); end; temperatureIR.OnExample := {$ifdef FPC}@{$endif}example.MyCallback;
The available callback property and their type of parameters are described below.
Note
Using callbacks for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.
procedure(sender: TBrickletTemperatureIR; const temperature: smallint) of object;
This callback is triggered periodically with the period that is set by SetAmbientTemperatureCallbackPeriod. The parameter is the ambient temperature of the sensor.
OnAmbientTemperature is only triggered if the ambient temperature has changed since the last triggering.
procedure(sender: TBrickletTemperatureIR; const temperature: smallint) of object;
This callback is triggered periodically with the period that is set by SetObjectTemperatureCallbackPeriod. The parameter is the object temperature of the sensor.
OnObjectTemperature is only triggered if the object temperature has changed since the last triggering.
procedure(sender: TBrickletTemperatureIR; const temperature: smallint) of object;
This callback is triggered when the threshold as set by SetAmbientTemperatureCallbackThreshold is reached. The parameter is the ambient temperature of the sensor.
If the threshold keeps being reached, the callback is triggered periodically with the period as set by SetDebouncePeriod.
procedure(sender: TBrickletTemperatureIR; const temperature: smallint) of object;
This callback is triggered when the threshold as set by SetObjectTemperatureCallbackThreshold is reached. The parameter is the object temperature of the sensor.
If the threshold keeps being reached, the callback is triggered periodically with the period as set by SetDebouncePeriod.
This constant is used to identify a Temperature IR Bricklet.
The GetIdentity function and the OnEnumerate callback of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.