Drive a relay or output with GPIO

To switch a relay, LED, or other load from Synacl:

  1. Add a device with protocol gpio-digital-out, pick the gateway, and set:
    • pinNumber and activeHigh (polarity),
    • defaultState (0/1) — the state at boot.
  2. Add a control widget to a dashboard:
  3. Toggling the widget publishes a write to the gateway; you'll see device/write and device/write/ack events.

For variable output (dimming, speed), use gpio-pwm with a slider-control instead.

More in Devices
Devices vs. gateways
When you need a gateway, and when a device can talk to us directly.
Device parameters (tags) explained
Tags are the named measurements a device reports — what widgets bind to.
How device online/offline status works
A device is online if we've seen a message in the last 90 seconds.
Alert thresholds (and the yellow dot)
Set a high/low range on a tag; the device dot turns yellow when a reading goes out of range.
Why a device gets suspended
Repeated rate-limit violations suspend a device temporarily — here's the cycle.
Editing, moving, and deleting a device
Change a device's name, connection settings, gateway, or remove it.