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On this page
  • Datastream
  • Widget Controls
  • Widget Settings
  • How to send data from device to Simple Chart widget
  • Change Widget Properties
  • Properties you can change
  • Change widget properties via HTTPs API
  • Updates the Datastream Property and all assigned Widgets
  • Sync to the latest known state

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  1. Blynk.Apps
  2. Widgets Displays

Simple Chart

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Last updated 1 year ago

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Visualize live and historical data in a chart from a single datastream. Applications include sensor data and binary event logging. Choose from data aggregation options of average and sum. The Y-axis scaling can be customized. Scrolling is an option, and you can connect missing data points.

See also the that can handle multiple datastreams, shows the Y axis values, and supports the chart types of line, step, area, bar, state.

Simple Chart features:

  • line, stepped line, or bar chart types

  • plotting data resolutions: 1 min, 1 hour, or 1 day

  • plotting time ranges from 6 hours to 1 year

  • auto-scaled or fixed data axis

  • highlighted min/max values

  • easily reveal individual points via tap-n-hold

  • scrollable time axis

  • numerous styling settings

  • full-screen mode

Datastream

Widget Controls

The widget has the following controls:

  1. Time Ranges: tap to select a time range. These are configurable under the widget settings.

  2. Full Screen: when enabled, the full screen icon will be displayed at the lower right of the widget. Tap to zoom the chart to the full screen.

Widget Settings

The widget has extensive charting display options that are easily explored interactively with the preview. Chart types of line, step, area, bar, and binary are configurable for each datastream assigned.

Data

Select a datastream which has numerical (i.e. of Int or Double) data type and comes from the device. Data that the app sends to the device is not registered. Simple Chart widget shows data from a single datastream. If you need to plot multiple datastreams in a single chart, check the Super Chart widget. By default the chart shows the average value (AVG) for each point on the chart, but you can change aggregation to (SUM) total of the incoming data. The time period covered by each point on the chart is defined by the selected Time Range/Resolution (see below).

Chart Style

Choose chart type (Line, Bar, or Step line) and its visual properties, like line width, color or gradient, axes style, etc. Note: when the gradient option is used, its color distribution is based on min/max properties of the selected datastream.

Time Ranges / Resolution

Select up to 7 time ranges you want to be able to switch between in the widget. Each time range button you select specifies its resolution - that is a period of time covered by each single point on a chart. Whenever there are multiple actual data writings coming from the device within the resolution period, that data is aggregated into one point (calculating average or total depending on the selection made in the Data section (see above).

Y-Axis Scaling

There are a number of ways to define the range of values to be shown on a chart. Select option to:

  • use datastream min/max (available for AVG aggregation, not available for SUM aggregation)

  • auto scale the visual range to always fit all the data

  • 0-Auto: auto-scale but always start from zero

  • define fixed min and max of the visual range

  • define delta: chart is auto-scaled, but its range never gets less than the delta set

Summary

Turn on Summary to show the average or total of all values presented on the chart in the top right corner. Note: summary style settings also define the style of selected value during tap-n-hold.

Other Settings

  • Show or hide a button at the bottom right to go to full-screen mode

  • Allow chart scrolling along the time axis. On scrolling, the chart and the summary are updated according to the new time range

  • Whether the line chart should connect missing points - that is all available points are connected in a line. Turn it off to visualize points without neighbours

How to send data from device to Simple Chart widget

float sensorData = readSensor(); 
Blynk.virtualWrite(V5, sensorData);

Reading the widget value(s)

You can read the latest values from the datastreams assigned to the widget. For datastream V1 of data type double:

BLYNK_WRITE(V1) {
// Called when the datastream V1 value changes

double pinValue = param.asDouble();
Serial.print(“V1: “);
Serial.println(pinValue, 3);

}

To get the latest datastream value assigned to V1:

https://{server_address}/external/api/get/?token={your 32 char token}&V1

To get the historical values assigned to datastream V1:

https://{server_address}/external/api/data/get/?token={your 32 char token}&period={PERIOD}&granularityType={TYPE}&sourceType={SOURCE_TYPE}&tzName={tzName}&format={FORMAT}&output=FILE&pin={pin}

https://{server_address}/external/api/data/get/?token={your 32 char token}&period=WEEK&granularityType=RAW_DATA&sourceType=MAX&tzName=America/New_York&format=ISO_SIMPLE&sendEvents=true&output=FILE&pin=V1

Changing the datastream value(s)

You can change the value of the datastream assigned to the widget with the hardware or HTTP API. The widget works best with historical data sent on a constant interval.

For a datastream V1 assigned the data type of double.

Hardware:

Blynk.virtualWrite(V1, 3.14159);

HTTP API:

https://{server_address}/external/api/update/?token={your 32 char token}&V1=3.14159

Change Widget Properties

You can change certain properties of the Widget from your hardware. For that, use this command:

Blynk.setProperty(vPin, "widgetProperty", "propertyValue"); 

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.

Properties you can change

Change Widget Label

Blynk.setProperty(V1, "label", "Air temperature");

Set Color

'Color' property changes title color if the title is set and is visible.

//#D3435C - Blynk RED 
Blynk.setProperty(V1, "color", "#D3435C");

Disable/Enable

Widget will be greyed out on UI and users won't be able to tap on it.

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

Show/Hide

Widget will be hidden from dashboard. Design your UI so that it doesn't look weird when there is no widget.

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

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

Name
Type
Description

{server address}*

string

Query Parameters

Name
Type
Description

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

hexadecimal, must include the hash # character urlencoded as %23. 'Color' property changes title color if the title is set and is visible.

isDisabled

string

true or false

isHidden

string

true or false

{"error":{"message":"Invalid token."}}

Sync to the latest known state

BLYNK_CONNECTED() { 
  // Called when hardware is connected to Blynk.Cloud  

  // get the latest value for V1
  Blynk.syncVirtual(V1); 

  // Request Blynk server to re-send latest values for all pins
  Blynk.syncAll()
}

Select or create a datastream of integer or double.

Usually, just make sure that the data coming from the device is numerical. See more details on sending data .

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.

data type
here
timers
Basic Sketch
Set Property
VirtualPinWrite
VirtualPinRead
HTTP API
State Syncing
More information
virtual pin
SuperChart widget
auth token