Last updated
Last updated
The Vertical Step Slider varies the datastream value between the datastream’s min/max values based on the slider’s vertical position, in increments of the step setting. It is similar in the way a rotary encoder is used to vary an output based on its position.
Select or create a datastream of integer or double. Widget properties (label, color, etc.) are also changed via the datastream, but only for virtual, enumerable, and location pins, not digital and analog pins.
The widget has the following controls:
Step: Defines the minimum increment of values generated in response to movement of the slider by the user. Note that if the hardware, Blynk.Console widget, or HTTP API changes the datastream value, then that change will be reflected in the slider position.
Send on release: Enable to limit updating the assigned datastream value only when the control is released by the user.
When the control is pressed, value is sent and stored into the Blynk.Cloud. After that it's sent to your device.
For example, if Slider widget is set to Datastream with Virtual Pin V1, you can use such code:
You can update the assigned datastream value using the hardware or HTTP API.
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.
Set a custom step or datastream value increment/decrement.
Widget will be hidden from dashboard. Design your UI so that it doesn't look weird when there is no widget.
Widget will be greyed out on UI and users won't be able to tap on it.
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=V1&step=10
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
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 step, color, label, isDisabled, isHidden, and page of the widget from your hardware, or via an . The color hexadecimal values in the HTTP API URL must include the hash # character urlencoded as %23.
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.