Chart widget
What it does
Streaming line chart bound to one virtual pin. The canvas keeps a ring buffer of the most recent samples; historical backfill is fetched separately.
Pins
- Semantics: Single virtual pin (V1..V127)
- Reads from one virtual pin, V1..V127.
- Default size: 6 x 3
Config fields
| Field | Type | Default | Effect |
|---|---|---|---|
min | number | — | Y-axis lower bound; auto when empty. |
max | number | — | Y-axis upper bound; auto when empty. |
points | number | 100 | Ring buffer depth. |
flow | select (right / left) | right | New-sample insertion side. |
showLegend | boolean | true | Shows the legend chip. |
fill | boolean | false | Fills the area under the line. |
color | color | — | Line color. |
Typical use
firmware.ino
void loop() { float value = readCurrent(); Blynk.virtualWrite(V4, value);}iOS app
Partial — iOS SuperChart adds multi-stream + period selectors beyond the canvas tile.