Switch
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Toggles between ON/OFF state (or any other two states) each time it is pressed. Visually simulates a switch appearance. The widget has the same functionality as a Button in ‘Switch’ mode.
Select or create a datastream of integer, double, or string. Widget properties (label, color, etc.) are also changed via the datastream, but only for virtual, enumerable, and location pins, not digital and analog pins.
When switch is pressed, value is sent and stored into the Blynk.Cloud. After that it's sent to your device.
For example, if Switch Widget is set to Datastream with Virtual Pin V1, you can use such code:
You can set the state of the widget by updating the assigned datastream value using the hardware or HTTP API. When the widget option ‘Use datastream’s Min/Max’ is enabled, then you set the datastream to the value assigned to the datastream max in order to set the switch state to ON, and set it to the datastream min value to set the switch state OFF. When the widget option ‘Use datastream’s Min/Max’ is disabled, then you specify the values to use for the OFF/ON states.
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&isDisabled=true
{server address}*
string
token*
string
pin*
string
{property}
string
The property of the widget you want to update: label
, isDisabled
, isHidden
label
string
the text used as widget label
isDisabled
string
true or false
isHidden
string
true or false
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.