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2.4.
External I/O
To fulfill an even wider range of applications and use cases, UnaBell LTE-M may also act as a
battery-powered gateway when used with its corresponding plug-and-play accessories in
addition to the embedded button on the device. The configuration in UC should be updated
to the accessory that is plugged into the device.
The accessories can be plugged to UnaBell LTE-M via 3.5mm audio jack connectors and their
main use cases are:
● Reed Switch Accessory: detect opening/closing of doors
● Temperature Probe Accessory: measure ambient temperature of the surrounding space
● 2 Wire Accessory: connect with other sensors (e.g. pressure sensor)
*You can put the rubber plug inside the device casing.
2.4.1.
Reed Switch Accessory
When the reed switch accessory is connected to UnaBell LTE-M, the same operation mode
and configurations for the embedded button is applied to the reed switch external I/O
connector, and the recommended detection mode for the external I/O is edge detection.
An example scenario is that the reed switch sensor is connected to UnaBell LTE-M to detect
the opening and closing of a door. The edge detection in event mode detects the instance
that the magnets are closed or separated and sends a message immediately when the door
is opened and closed.
UnaBell LTE-M User Manual
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