The Lithium Door/Window (Open/Close) Sensor is a quality product provided by Lithium under their Smart Home brand MerryIoT. It is designed to be used for detection of unauthorised opening/closing of doors and windows.

It is a compatible device within the Lithium App, and it is used under the Security category.

Quick Setup (Lithium App)

Step 1. Remove the packaging and insert the provided batteries (Li-SiO2 battery, “ER14250”, 1/2 AA size x 2 pcs), using a small screwdriver (Cross-type screwdriver PH0). Pay attention to +/- direction, as this may be different from other battery-operated devices.

Step 2. Activate the device, by long pressing the Test Button on the side of the sensor for 5 seconds. Once the sensor joins the network, the LED will keep on for 3 seconds.

Step 3. Enrol the sensor in your account, by opening the Lithium App, touching the + (plus) icon under “Your Devices.” drawer list, and easy scanning the QR code on the side of the sensor’s body.

Step 4. If your device is a compatible model and it is enrolled in the Lithium system, the “Add Sensor” screen will be displayed, for you to check the details and use the map to fine tune the location of the sensor, by touching in the green circular area.

Step 5. Install the device on the target door or window. The sensor consists of two parts: the sensor body and the magnetic part. Use the double sided tape on the back of the sensors to fix them on the door/window. One piece (e.g. the body) should be ideally placed on the fixed side of the door/window, and the other piece (e.g. magnetic part) should be ideally placed on the moving door/window.

Test

Now the sensor is installed. You DO NOT have to create a real Security emergency on the public map to test if the sensor is properly sending signals.

Step 1. Arm Security system, using the on-screen floating button with the Shield symbol.

Step 2. Press the Test Button on the side of the sensor. The Blue LED will blink quickly and you should receive a Test Push Notification from the Lithium App.

Step 3. Disarm Security system, if you are not going to use it.

Now everything works properly. You are DONE!

How does the sensor work within Lithium App?

Arming

The sensor will transmit data ONLY when the user ARMS the security system using the on-screen floating button.

Keep-Alive

While Armed, the sensor will transmit a Keep-Alive control signal, every 6 hours, containing the state of the sensor (open or close).

Error State

While Armed, if the sensor is not sending any data, not even the Keep-Alive signal at all within 24 hours, it will move into Error State and you will receive a notification to make you aware and allow you to check for any issue.

Trigger

While Armed, the sensor will send data upon every open and close action. If the sensor sends the Open status, then a Security emergency is triggered and published on the map, alerting users nearby (if the sensor is not in Silent Mode).

Ending an active Emergency

While Armed, the sensor will do send the Close status, but this will NOT end the active Emergency, nor mark it as a solved Emergency,

The ONLY way to end an active Security Emergency is to DISARM the Security system using the on-screen floating button. Disarming will mark the Emergency as Solved . This means the Owner is aware of the Emergency and the situation is stable, so no need to worry for the other users nearby.

The Solved Event will be automatically removed from the map after 10 minutes from marking as Solved (it can take maximum 20 minutes).

Ending a stale Emergency

For almost all sensors the emergency status will be updated by the consequent data transfers of the originating sensor.

If the sensor is not sending any update after the initial Emergency trigger, for more than ~6 hours, it will become irelevant and it will be automatically ended and removed from the map.

For the current Door/Window sensor, it means that sending the Keep-Alive signal every 6 hours will keep the Emergency active indefinitely, until the Owner of the sensor disarms the security system.

Troubleshoot

If you think the device is not sending data properly, you can try the following.

1. Arm the device in the Lithium App, disarm and arm again. Check if the Test notification works, by pressing the Test Button on the side of the sensor.
2. Arm the device and perform a re-join procedure, to force the sensor to re-join the LoRaWAN network. To perform it, you need to long press on the Test Button for 5 seconds and release. The blue LED will blink quickly and then will stay lit for a couple of seconds if the Join was successful. Now the device is properly sending data over the LoRaWAN network around.

3. Check your Helium coverage at https://explorer.helium.com or https://mappers.helium.com. If you do not have coverage, you can expand the Helium network by installing a compatible Helium gateway. Check it out at https://heliummart.com.
4. In case you do have Helium coverage, make sure the gateways are online in the Helium Explorer, and try to move the sensor around in a different spot of your location. Better, try to join the sensor and check the signal outdoors. If you can use the sensor outdoors, then it might be your building materials are obstructionist the LoRa signal. Try placing the sensor as close to the outside as possible, such as on the house front door or a top level window.
5. Last thing you can do is to re-try all the Quick Setup steps. Just delete the sensor from the Update Sensor screen and re-add it as usual.

Still having issues?

You can use the official Lithium Community Discord channel to ask for help.

You can use the website support form here: https://lithium-app.com/support

You can write us an email with a detailed description of the issue at support@lithium-app.com

The original product information, data sheet and user guide may be found on the MerryIoT website here: https://www.merryiot.com/Product/Detail/7