Radial Gauge
A 360 degree radial display filled proportionally to the latest datastream value and the datastream min and max values. The last datastream value is also shown as a number in the center of the display.
Datastream
Select or create a datastream of data type 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 “color” property changes the color of the radial gauge and the latest value shown in the center of the gauge.
Widget Controls
The widget has no controls.
How to process widget input on the device
The datastream value displayed is updated whenever the value stored on Blynk.Cloud changes.
Reading the widget value(s)
Changing the datastream value
You can update the assigned datastream value using the hardware or HTTP API.
Hardware:
HTTP API:
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 timers.
Sketch: Basic Sketch
Sketch: Set Property
Sketch: VirtualPinWrite
Sketch: VirtualPinRead
Change Widget Properties
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 towidgetProperty
: property you want to changepropertyValue
: 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.
Properties you can change
You can change the properties label, color, isDisabled, isHidden of the widget from your hardware, or via an HTTP API. 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.
Change Label
Set Color
Disable/Enable
Widget will be greyed out on UI and users won't be able to tap on it.
Show/Hide
Widget will be hidden from dashboard. Design your UI so that it doesn't look weird when there is no widget.
Change widget properties via HTTPs API
Updates the Datastream Property and all assigned Widgets
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
Path Parameters
Query Parameters
{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
Sync to the latest known state
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 State Syncing for more details.
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