Numeric Input
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Increments or decrements the last datastream value by a configured step value. Only the whole number part of a double data type value will be incremented/decremented. You can also type the number in directly.
Select or create a datastream of integer or double.
The widget has the following controls:
+ tap to increase the whole part of the datastream value by the STEP.
- tap to decrease the whole part of the datastream value by the STEP.
STEP - the amount the datastream value is incremented/decremented by.
Loop values: when enabled, causes the value to loop to the datastream’s assigned min/max value when the min/max is exceeded. When disabled, the datastream value may only be incremented/decremented to the datastream’s min/max value.
When the number is entered into the widget input field or +/- tapped, the new value is sent and stored into the Blynk.Cloud. After that it's sent to your device.
For example, if the Widget is set to Datastream with Virtual Pin V1, you can use such code:
You can change the value of the datastream assigned to the widget with the hardware or HTTP API.
For a datastream V1 assigned data type of integer or double:
Hardware:
HTTP API:
You can change certain properties of the Widget from your hardware. For that, use this command:
Where:
vPin
is: virtual pin number the widget is assigned to
widgetProperty
: property you want to change
propertyValue
: value of the property you want to change
Don't put Blynk.setProperty()
into the void loop()
as it can cause a flood of messages and your hardware will be disconnected. Send such updates only when necessary, or use timers.
Widget will be greyed out on UI and users won't be able to tap on it.
Widget will be hidden from dashboard. Design your UI so that it doesn't look weird when there is no widget.
GET
https://{server_address}/external/api/update/property?token={your 32 char token}&pin={your vPin}&{property}={value}
The endpoint allows you to update the Datastream Property value via GET request. All widgets (both web and mobile) that are assigned to this datastream will inherit this property. The Datastream Property is persistent and will be stored forever until you change it with another value. In order to clear the property you need to clear the device data in device actions menu.
Example:
https://blynk.cloud/external/api/update/property?token=GVki9IC70vb3IqvsV0YD3el4y0OpneL1&pin=V2&label=My%20Label
https://blynk.cloud/external/api/update/property?token=GVki9IC70vb3IqvsV0YD3el4y0OpneL1&pin=V1&color=%23D3435C
https://blynk.cloud/external/api/update/property?token=GVki9IC70vb3IqvsV0YD3el4y0OpneL1&pin=V1&isDisabled=true
{server address}*
string
token*
string
pin*
string
{property}
string
The property of the widget you want to update: label
, color
, isDisabled
, isHidden
label
string
the text used as widget label
color
string
button color hexadecimal, must include the hash # character urlencoded as %23
isDisabled
string
true or false
isHidden
string
true or false
step
string
the amount the datastream value is incremented/decremented by
Don't put Blynk.virtualWrite()
into the void loop()
as it can cause a flood of messages and your hardware will be disconnected. Send such updates only when necessary, use flags, or .
Sketch:
Sketch:
Sketch:
Sketch:
You can change the properties label, color, isDisabled, isHidden of the widget from your hardware, or via an . The URL must be encoded, so spaces in labels must be replaced with %20, and color hexadecimal values in the HTTP API URL must include the hash # character urlencoded as %23.
Get from the bottom right of your Blynk console. .
Device from Device info
The datastream (should start with "v")
You can update your hardware to the latest datastream value from Blynk.Cloud after your hardware went offline, and then came online again. Use Blynk.syncVirtual()
to update a single virtual pin, or Blynk.syncAll()
to update all virtual pins. See for more details.