This is the description of the JavaScript API bindings for the Current12 Bricklet. General information and technical specifications for the Current12 Bricklet are summarized in its hardware description.
An installation guide for the JavaScript 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 | var Tinkerforge = require('tinkerforge');
var HOST = 'localhost';
var PORT = 4223;
var UID = 'XYZ'; // Change XYZ to the UID of your Current12 Bricklet
var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var c = new Tinkerforge.BrickletCurrent12(UID, ipcon); // Create device object
ipcon.connect(HOST, PORT,
function (error) {
console.log('Error: ' + error);
}
); // Connect to brickd
// Don't use device before ipcon is connected
ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
function (connectReason) {
// Get current current
c.getCurrent(
function (current) {
console.log('Current: ' + current/1000.0 + ' A');
},
function (error) {
console.log('Error: ' + error);
}
);
}
);
console.log('Press key to exit');
process.stdin.on('data',
function (data) {
ipcon.disconnect();
process.exit(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 | var Tinkerforge = require('tinkerforge');
var HOST = 'localhost';
var PORT = 4223;
var UID = 'XYZ'; // Change XYZ to the UID of your Current12 Bricklet
var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var c = new Tinkerforge.BrickletCurrent12(UID, ipcon); // Create device object
ipcon.connect(HOST, PORT,
function (error) {
console.log('Error: ' + error);
}
); // Connect to brickd
// Don't use device before ipcon is connected
ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
function (connectReason) {
// Set period for current callback to 1s (1000ms)
// Note: The current callback is only called every second
// if the current has changed since the last call!
c.setCurrentCallbackPeriod(1000);
}
);
// Register current callback
c.on(Tinkerforge.BrickletCurrent12.CALLBACK_CURRENT,
// Callback function for current callback
function (current) {
console.log('Current: ' + current/1000.0 + ' A');
}
);
console.log('Press key to exit');
process.stdin.on('data',
function (data) {
ipcon.disconnect();
process.exit(0);
}
);
|
Download (ExampleThreshold.js)
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 | var Tinkerforge = require('tinkerforge');
var HOST = 'localhost';
var PORT = 4223;
var UID = 'XYZ'; // Change XYZ to the UID of your Current12 Bricklet
var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var c = new Tinkerforge.BrickletCurrent12(UID, ipcon); // Create device object
ipcon.connect(HOST, PORT,
function (error) {
console.log('Error: ' + error);
}
); // Connect to brickd
// Don't use device before ipcon is connected
ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
function (connectReason) {
// Get threshold callbacks with a debounce time of 10 seconds (10000ms)
c.setDebouncePeriod(10000);
// Configure threshold for current "greater than 5 A"
c.setCurrentCallbackThreshold('>', 5*1000, 0);
}
);
// Register current reached callback
c.on(Tinkerforge.BrickletCurrent12.CALLBACK_CURRENT_REACHED,
// Callback function for current reached callback
function (current) {
console.log('Current: ' + current/1000.0 + ' A');
}
);
console.log('Press key to exit');
process.stdin.on('data',
function (data) {
ipcon.disconnect();
process.exit(0);
}
);
|
Download (ExampleSimple.html), Test (ExampleSimple.html)
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 | <!DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>Tinkerforge | JavaScript Example</title>
</head>
<body>
<div style="text-align:center;">
<h1>Current12 Bricklet Simple Example</h1>
<p>
<input value="localhost" id="host" type="text" size="20">:
<input value="4280" id="port" type="text" size="5">,
<input value="uid" id="uid" type="text" size="5">
<input value="Start Example" id="start" type="button" onclick="startExample();">
</p>
<p>
<textarea readonly id="text" cols="80" rows="24" style="resize:none;"
>Press "Start Example" to begin ...</textarea>
</p>
</div>
<script src="./Tinkerforge.js" type='text/javascript'></script>
<script type='text/javascript'>
var ipcon;
var textArea = document.getElementById("text");
function startExample() {
textArea.value = "";
var HOST = document.getElementById("host").value;
var PORT = parseInt(document.getElementById("port").value);
var UID = document.getElementById("uid").value;
if(ipcon !== undefined) {
ipcon.disconnect();
}
ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var c = new Tinkerforge.BrickletCurrent12(UID, ipcon); // Create device object
ipcon.connect(HOST, PORT,
function(error) {
textArea.value += 'Error: ' + error + '\n';
}
); // Connect to brickd
// Don't use device before ipcon is connected
ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
function (connectReason) {
// Get current current
c.getCurrent(
function (current) {
textArea.value += 'Current: ' + current/1000.0 + ' A\n';
},
function (error) {
textArea.value += 'Error: ' + error + '\n';
}
);
}
);
}
</script>
</body>
</html>
|
Download (ExampleCallback.html), Test (ExampleCallback.html)
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 | <!DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>Tinkerforge | JavaScript Example</title>
</head>
<body>
<div style="text-align:center;">
<h1>Current12 Bricklet Callback Example</h1>
<p>
<input value="localhost" id="host" type="text" size="20">:
<input value="4280" id="port" type="text" size="5">,
<input value="uid" id="uid" type="text" size="5">
<input value="Start Example" id="start" type="button" onclick="startExample();">
</p>
<p>
<textarea readonly id="text" cols="80" rows="24" style="resize:none;"
>Press "Start Example" to begin ...</textarea>
</p>
</div>
<script src="./Tinkerforge.js" type='text/javascript'></script>
<script type='text/javascript'>
var ipcon;
var textArea = document.getElementById("text");
function startExample() {
textArea.value = "";
var HOST = document.getElementById("host").value;
var PORT = parseInt(document.getElementById("port").value);
var UID = document.getElementById("uid").value;
if(ipcon !== undefined) {
ipcon.disconnect();
}
ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var c = new Tinkerforge.BrickletCurrent12(UID, ipcon); // Create device object
ipcon.connect(HOST, PORT,
function(error) {
textArea.value += 'Error: ' + error + '\n';
}
); // Connect to brickd
// Don't use device before ipcon is connected
ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
function (connectReason) {
// Set period for current callback to 1s (1000ms)
// Note: The current callback is only called every second
// if the current has changed since the last call!
c.setCurrentCallbackPeriod(1000);
}
);
// Register current callback
c.on(Tinkerforge.BrickletCurrent12.CALLBACK_CURRENT,
// Callback function for current callback
function (current) {
textArea.value += 'Current: ' + current/1000.0 + ' A\n';
textArea.scrollTop = textArea.scrollHeight;
}
);
}
</script>
</body>
</html>
|
Download (ExampleThreshold.html), Test (ExampleThreshold.html)
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 | <!DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>Tinkerforge | JavaScript Example</title>
</head>
<body>
<div style="text-align:center;">
<h1>Current12 Bricklet Threshold Example</h1>
<p>
<input value="localhost" id="host" type="text" size="20">:
<input value="4280" id="port" type="text" size="5">,
<input value="uid" id="uid" type="text" size="5">
<input value="Start Example" id="start" type="button" onclick="startExample();">
</p>
<p>
<textarea readonly id="text" cols="80" rows="24" style="resize:none;"
>Press "Start Example" to begin ...</textarea>
</p>
</div>
<script src="./Tinkerforge.js" type='text/javascript'></script>
<script type='text/javascript'>
var ipcon;
var textArea = document.getElementById("text");
function startExample() {
textArea.value = "";
var HOST = document.getElementById("host").value;
var PORT = parseInt(document.getElementById("port").value);
var UID = document.getElementById("uid").value;
if(ipcon !== undefined) {
ipcon.disconnect();
}
ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var c = new Tinkerforge.BrickletCurrent12(UID, ipcon); // Create device object
ipcon.connect(HOST, PORT,
function(error) {
textArea.value += 'Error: ' + error + '\n';
}
); // Connect to brickd
// Don't use device before ipcon is connected
ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
function (connectReason) {
// Get threshold callbacks with a debounce time of 10 seconds (10000ms)
c.setDebouncePeriod(10000);
// Configure threshold for current "greater than 5 A"
c.setCurrentCallbackThreshold('>', 5*1000, 0);
}
);
// Register current reached callback
c.on(Tinkerforge.BrickletCurrent12.CALLBACK_CURRENT_REACHED,
// Callback function for current reached callback
function (current) {
textArea.value += 'Current: ' + current/1000.0 + ' A\n';
textArea.scrollTop = textArea.scrollHeight;
}
);
}
</script>
</body>
</html>
|
Generally, every function of the JavaScript bindings can take two optional
parameters, returnCallback
and errorCallback
. These are two user
defined callback functions. The returnCallback
function is called with the
results as arguments, if the function returns its results asynchronously. The
errorCallback
is called with an error code in case of an error. The error
code can be one of the following values:
The namespace for the JavaScript bindings is Tinkerforge.*
.
BrickletCurrent12
(uid, ipcon)¶Parameters: |
|
---|---|
Returns: |
|
Creates an object with the unique device ID uid
:
var current12 = new BrickletCurrent12("YOUR_DEVICE_UID", ipcon);
This object can then be used after the IP Connection is connected.
BrickletCurrent12.
getCurrent
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
Returns the current of the sensor.
If you want to get the current periodically, it is recommended to use the
CALLBACK_CURRENT
callback and set the period with
setCurrentCallbackPeriod()
.
BrickletCurrent12.
calibrate
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
Calibrates the 0 value of the sensor. You have to call this function when there is no current present.
The zero point of the current sensor is depending on the exact properties of the analog-to-digital converter, the length of the Bricklet cable and the temperature. Thus, if you change the Brick or the environment in which the Bricklet is used, you might have to recalibrate.
The resulting calibration will be saved on the EEPROM of the Current Bricklet.
BrickletCurrent12.
isOverCurrent
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
Returns true if more than 12.5A were measured.
Note
To reset this value you have to power cycle the Bricklet.
BrickletCurrent12.
getAnalogValue
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
Returns the value as read by a 12-bit analog-to-digital converter.
Note
The value returned by getCurrent()
is averaged over several samples
to yield less noise, while getAnalogValue()
gives back raw
unfiltered analog values. The only reason to use getAnalogValue()
is,
if you need the full resolution of the analog-to-digital converter.
If you want the analog value periodically, it is recommended to use the
CALLBACK_ANALOG_VALUE
callback and set the period with
setAnalogValueCallbackPeriod()
.
BrickletCurrent12.
getIdentity
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
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.
BrickletCurrent12.
on
(callback_id, function[, errorCallback])¶Parameters: |
|
---|---|
Returns: |
|
Registers the given function
with the given callback_id
.
The available callback IDs with corresponding function signatures are listed below.
BrickletCurrent12.
setCurrentCallbackPeriod
(period[, returnCallback][, errorCallback])¶Parameters: |
|
---|---|
Callback Parameters: |
|
Returns: |
|
Sets the period with which the CALLBACK_CURRENT
callback is triggered
periodically. A value of 0 turns the callback off.
The CALLBACK_CURRENT
callback is only triggered if the current has changed since
the last triggering.
BrickletCurrent12.
getCurrentCallbackPeriod
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
Returns the period as set by setCurrentCallbackPeriod()
.
BrickletCurrent12.
setAnalogValueCallbackPeriod
(period[, returnCallback][, errorCallback])¶Parameters: |
|
---|---|
Callback Parameters: |
|
Returns: |
|
Sets the period with which the CALLBACK_ANALOG_VALUE
callback is triggered
periodically. A value of 0 turns the callback off.
The CALLBACK_ANALOG_VALUE
callback is only triggered if the analog value has
changed since the last triggering.
BrickletCurrent12.
getAnalogValueCallbackPeriod
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
Returns the period as set by setAnalogValueCallbackPeriod()
.
BrickletCurrent12.
setCurrentCallbackThreshold
(option, min, max[, returnCallback][, errorCallback])¶Parameters: |
|
---|---|
Callback Parameters: |
|
Returns: |
|
Sets the thresholds for the CALLBACK_CURRENT_REACHED
callback.
The following options are possible:
Option | Description |
---|---|
'x' | Callback is turned off |
'o' | Callback is triggered when the current is outside the min and max values |
'i' | Callback is triggered when the current is inside the min and max values |
'<' | Callback is triggered when the current is smaller than the min value (max is ignored) |
'>' | Callback is triggered when the current is greater than the min value (max is ignored) |
The following constants are available for this function:
For option:
BrickletCurrent12.
getCurrentCallbackThreshold
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
Returns the threshold as set by setCurrentCallbackThreshold()
.
The following constants are available for this function:
For option:
BrickletCurrent12.
setAnalogValueCallbackThreshold
(option, min, max[, returnCallback][, errorCallback])¶Parameters: |
|
---|---|
Callback Parameters: |
|
Returns: |
|
Sets the thresholds for the CALLBACK_ANALOG_VALUE_REACHED
callback.
The following options are possible:
Option | Description |
---|---|
'x' | Callback is turned off |
'o' | Callback is triggered when the analog value is outside the min and max values |
'i' | Callback is triggered when the analog value is inside the min and max values |
'<' | Callback is triggered when the analog value is smaller than the min value (max is ignored) |
'>' | Callback is triggered when the analog value is greater than the min value (max is ignored) |
The following constants are available for this function:
For option:
BrickletCurrent12.
getAnalogValueCallbackThreshold
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
Returns the threshold as set by setAnalogValueCallbackThreshold()
.
The following constants are available for this function:
For option:
BrickletCurrent12.
setDebouncePeriod
(debounce[, returnCallback][, errorCallback])¶Parameters: |
|
---|---|
Callback Parameters: |
|
Returns: |
|
Sets the period with which the threshold callbacks
are triggered, if the thresholds
keep being reached.
BrickletCurrent12.
getDebouncePeriod
([returnCallback][, errorCallback])¶Callback Parameters: |
|
---|---|
Returns: |
|
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
with the on()
function of
the device object. The first parameter is the callback ID and the second
parameter the callback function:
current12.on(BrickletCurrent12.CALLBACK_EXAMPLE,
function (param) {
console.log(param);
}
);
The available constants with inherent number and 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.
BrickletCurrent12.
CALLBACK_CURRENT
¶Callback Parameters: |
|
---|
This callback is triggered periodically with the period that is set by
setCurrentCallbackPeriod()
. The parameter is the current of the
sensor.
The CALLBACK_CURRENT
callback is only triggered if the current has changed since
the last triggering.
BrickletCurrent12.
CALLBACK_ANALOG_VALUE
¶Callback Parameters: |
|
---|
This callback is triggered periodically with the period that is set by
setAnalogValueCallbackPeriod()
. The parameter is the analog value
of the sensor.
The CALLBACK_ANALOG_VALUE
callback is only triggered if the current has changed since the
last triggering.
BrickletCurrent12.
CALLBACK_CURRENT_REACHED
¶Callback Parameters: |
|
---|
This callback is triggered when the threshold as set by
setCurrentCallbackThreshold()
is reached.
The parameter is the current of the sensor.
If the threshold keeps being reached, the callback is triggered periodically
with the period as set by setDebouncePeriod()
.
BrickletCurrent12.
CALLBACK_ANALOG_VALUE_REACHED
¶Callback Parameters: |
|
---|
This callback is triggered when the threshold as set by
setAnalogValueCallbackThreshold()
is reached.
The parameter is the analog value of the sensor.
If the threshold keeps being reached, the callback is triggered periodically
with the period as set by setDebouncePeriod()
.
BrickletCurrent12.
CALLBACK_OVER_CURRENT
¶Callback Parameters: |
|
---|
This callback is triggered when an over current is measured
(see isOverCurrent()
).
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.
BrickletCurrent12.
getAPIVersion
()¶Returns: |
|
---|
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.
BrickletCurrent12.
getResponseExpected
(functionId[, errorCallback])¶Parameters: |
|
---|---|
Returns: |
|
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 sent and errors are silently ignored, because they cannot be detected.
The following constants are available for this function:
For function_id:
BrickletCurrent12.
setResponseExpected
(functionId, responseExpected[, errorCallback])¶Parameters: |
|
---|---|
Returns: |
|
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:
BrickletCurrent12.
setResponseExpectedAll
(responseExpected)¶Parameters: |
|
---|---|
Returns: |
|
Changes the response expected flag for all setter and callback configuration functions of this device at once.
BrickletCurrent12.
DEVICE_IDENTIFIER
¶This constant is used to identify a Current12 Bricklet.
The getIdentity()
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.
BrickletCurrent12.
DEVICE_DISPLAY_NAME
¶This constant represents the human readable name of a Current12 Bricklet.