Widget Properties

The widget property is a widget attribute like color, labels, min/max, ..., and others that could be dynamically changed from the hardware or HTTPS API.

Single Datastream

You can change the widget property assigned to a single datastream from the hardware side. For example, you can change the color of an LED widget assigned to Virtual Pin 0:

//change LED color
Blynk.setProperty(V0, "color", "#D3435C");

//change LED label
Blynk.setProperty(V0, "label", "My New Widget Label");

//change MENU labels
Blynk.setProperty(V0, "labels", "Menu Item 1", "Menu Item 2", "Menu Item 3");

Set Property for single value field

Set Property for multi value field

NOTE : Changing these parameters work only for widgets attached to Virtual pins (analog/digital pins won't work).

color, label, isDisabled, isHidden widget properties are supported for all widgets:

label is a string for the label of all widgets.

color is a string in HEX format (in the form: #RRGGBB, where RR (red), GG (green), and BB (blue) are hexadecimal values between 00 and FF). For example:

#define BLYNK_GREEN     "#23C48E"
#define BLYNK_BLUE      "#04C0F8"
#define BLYNK_YELLOW    "#ED9D00"
#define BLYNK_RED       "#D3435C"
#define BLYNK_DARK_BLUE "#5F7CD8"

On the firmware side, widget objects also support setLabel() and setColor() functions.

Widget-specific properties:


onLabel / offLabel is a string for ON/OFF label of a button;

Styled Button

onLabel / offLabel is a string for ON/OFF label of a button;

onColor / offColor is a string in HEX format for ON/OFF colors of the button;

onBackColor / offBackColor is a string in HEX format for ON/OFF colors of the button background.

Music Player

isOnPlay is boolean accepts true/false.

Blynk.setProperty(V0, "isOnPlay", "true");


labels is a list of strings for Menu widget selections;

Blynk.setProperty(V0, "labels", "label 1", "label 2", "label 3");

Video Streaming

Blynk.setProperty(V1, "url", "http://my_new_video_url");


Blynk.setProperty(V1, "step", 10);


Blynk.setProperty(V1, "opacity", 50); // 0-100%
Blynk.setProperty(V1, "scale", 30); // 0-100%
Blynk.setProperty(V1, "rotation", 10); //0-360 degrees

also, you can fully replace the list of images from the hardware:

Blynk.setProperty(V1, "urls", "https://image1.jpg", "https://image2.jpg");

or you can change the individual image by its index:

Blynk.setProperty(V1, "url", 1, "https://image1.jpg");

Alarm and Sound

Blynk.setProperty(V1, "isMuted", "true");

You can also change widget properties via HTTP API.

Multiple Datastreams

In addition to the above commands, you can also change the multiple datastream properties with one command. For example, let's assume, you want to disable multiple widgets with a single command:

Blynk.setProperty(V0, V1, V2, "isDisabled", "true");

The above command would be an alternative to the batch of single datastream commands:

Blynk.setProperty(V0, "isDisabled", "true");
Blynk.setProperty(V1, "isDisabled", "true");
Blynk.setProperty(V2, "isDisabled", "true");

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