LED

On or off, at a glance. A door, a pump, a connection, an alarm — the LED is a state you can read without reading.

What it does

It lights when the signal is anything but 0, and goes dark when it is 0. The device writes 1 or 0 (or HIGH / LOW, or a bool) and the LED follows.

When to use it

• A door or a contact — open / closed.
• Something running — a pump, a heater, a motor.
• A warning — red when a threshold is crossed, from the device’s own logic.

Set it up

1. Declare the signal — Tap the device icon at the top right, then Declare a signal: give it a name, a type and a unit, and fill in the Format — minimum, maximum, decimals — because that is what the widget will use to scale and print the value.
2. Place it — Back on the dashboard, in edit mode, tap + at the bottom and choose LED under Displays. Two columns square is enough.
3. Wire it to the signal — Tap the widget: its settings open. In the Data tab, tap Pick a signal and choose the signal you declared.
4. Write from the device — In the sketch, write the value to the signal’s address — InstantIoT.write(I1, value) — and it shows up in the widget within a second.

Settings

Tap the widget in edit mode: the sheet opens with a live preview at the top, then two tabs — Data for what it reads or writes, Appearance for how it looks.

Data — what it reads

Signal

Appearance — how it looks

Title

Display

Colors

States

• Off — grey. On — the On colour, with its halo.
• Device offline — the last state stays; check the device’s dot to know if it is current.

Arduino device code

The address is all the device knows — I5 here; use the one the app gave your signal. In the sketch, a 0 or anything else:

InstantIoT.write(I5, digitalRead(DOOR));

Complete sketch — Cloud

Paste it into the Arduino IDE, put your Wi-Fi and the token the app gave you, upload. It publishes once a second.

#include <InstantIoT.h>

const char* WIFI_SSID    = "MyWiFi";
const char* WIFI_PASS    = "MyPassword";
const char* DEVICE_TOKEN = "PASTE_TOKEN_HERE";

InstantTimer timers;

void publish() {
    InstantIoT.write(I5, digitalRead(DOOR));   // 1 open, 0 closed
}

void setup() {
    InstantIoT.begin(WiFiLink(WIFI_SSID, WIFI_PASS), Cloud(DEVICE_TOKEN));
    timers.every(1000, publish);
}

void loop() {
    InstantIoT.loop();
    timers.run();
}

Other connections

The widget block never changes. Only the begin() line says how the device reaches the app:

Direct needs no token: the phone is at the other end of the wire. See Connect for TLS, timeouts and what to do when it does not connect.

Any display works at the same address. A metric, a gauge and this widget on the same signal show the same value; the device does not change. Change the widget, not the sketch.

Notes

• An LED and a Switch on the same signal make a pair: the switch commands, the LED confirms what the device actually did if the device writes back.
• For a state the device decides on its own (an alarm), write it only when it changes.
• Want to be told, not just shown? A rule on the same signal sends a notification.

Next

→ Switch — to command the same state → Text — a state with words