BT510 Bluetooth 5 Long Range IP67 Multi-Sensor

Recommended for New Design (RND)


The Sentrius™ BT510 Sensor is a battery powered, Bluetooth v5 Long Range integrated open development device enabling application development for robust, reliable sensor data transfer in the harshest of environments.

The Sentrius™ BT510 packs in more than just a IP67 temperature sensor, also seamlessly integrating open / close contact and motion / impact detection and Bluetooth LE beaconing capabilities. 

The BT510 is powered by Ezurio's (formerly Laird Connectivity) field proven BL654 Bluetooth LE module that integrates Nordic Semiconductor’s nRF52840 silicon for feature rich application development in the Cortex M4F with 1 MB Flash memory, which also enables integrated sensor data logging and storage. The ultra-low power sensor uses a single replaceable CR2477 coin cell battery, for a multi-year life and hassle-free, long-term maintenance. 

The BT510 is a multi-sensor platform, with a magnetic reed switch sensor, temperature sensor, proximity sensor, and accelerometer. These multiple sensing capabilities support a massive array of use cases and applications, and its IP67 enclosure ensures robust protection for even the harshest of environments

Multi Sensor Platform – Integrated temperature, accelerometer and magnetic reed switch sensors 

Best-in-Class BTv5 Performance – Bluetooth LE long range, secure connections and Bluetooth LE beaconing 

Application Environment 

  • Utilize the Open source Zephyr RTOS to build your application using the Ezurio BT510 Zephyr board file and sample applications.
  • Alternatively use legacy FreeRTOS binary application with supporting mobile apps (Note : No future firmware updates planned) 

IP67 Enclosure – A rugged IP67 certified enclosure with simple twist / lock design for hassle free maintenance 

Replaceable Battery – Ultra low power capabilities and replaceable CR2477 coin cell 

Worldwide Approvals – Device certified for FCC, ISED, CE, UKCA, MIC, RCM, and Bluetooth SIG 

Customization – Custom branding, packaging, application development all available!

Temperature Sensor


Open / Close Sensor


Proximity Sensor


Acceleration Sensor


Best-in-Class Performance

Powered by our proven BL654 module with BLE Long Range and BLE beaconing



Feature rich application development using Nordic Semiconductor’s nRF52840


Replaceable Battery

Replaceable CR2477 coin cell battery for a multi-year, hassle-free life


Twist / Lock Design

Implements a simple twist / lock design for hassle-free maintenance


IP67 Certified

Rugged IP67 certified enclosure designed for the harshest environments


Small Footprint

A small, low-cost footprint to gather data across a wide-variety of applications


How far can power-saving take your application?

The Sentrius BT510 is a Bluetooth 5 Low Energy multi-sensor can last for months or years on its replaceable coin-cell battery. That battery life is dependent on lots of factors such as sleep time, ambient temperature, and more. Estimate how long your BT510 application can go on a single battery using our battery estimator tool.

Estimate Battery Life



3-axis MEMS – Programable motion and contact detection
Antenna Type
Onboard PCB antenna
CR2477 coin cell - replaceable
Chipset (Wireless)
Nordic nRF52840
Data Logging
7 days of temperature data at 15 minute read intervals
Dimension (Height - mm)
19 mm
Dimension (Length - mm)
80 mm
Dimension (Width - mm)
51 mm
LED Status
1 LED, multi-state
Mounting Style
Screw, zip-tie, or industrial velcro
Open / Close Contact
Omni polar magnetoresistive sensor
Operating Temperature
-20° - 60°C (limited by coin cell type)
Board reference to develop your applications with Zephyr RTOS
Temperature Accuracy Range
+/-0.5°C (temperature sensor IC capability)
Temperature Range
-40° to +125°C (temperature sensor IC capability)
Wireless Specification
Bluetooth v5
Part NumberAdditional DescriptionAntenna TypeChipset (Wireless)Frequency Range (Max)Frequency Range (Min)Logical InterfacesOS/SoftwarePackagingProduct TypeSystem ArchitectureTechnology
Recommended for New Design (RND)
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Sentrius™ BT510 Sensor Internal Nordic nRF52840 2483 MHz2400 MHzConfigurable Push Button Board reference to develop your applications with Zephyr RTOS Single IoT Sensor Hostless Bluetooth 5.0
Recommended for New Design (RND)
Buy Now
Sentrius™ BT510 Sensor Internal Nordic nRF52840 2483 MHz2400 MHzConfigurable Push Button Board reference to develop your applications with Zephyr RTOS Bulk IoT Sensor Hostless Bluetooth 5.0
Recommended for New Design (RND)
Buy Now
Magnet Kit (Open / Close) for Sentrius™ BT510 Internal Nordic nRF52840 2483 MHz2400 MHzConfigurable Push Button Board reference to develop your applications with Zephyr RTOS Bulk IoT Sensor Hostless Bluetooth 5.0

Development Kits

  • 453-00062-K1


    Additional Description
    USB-SWD Programming Kit: Includes mainboard, TC2050-IDC Tag Connect cable, 10-pin flat IDC cable, 1.2 m USB cable, and 2-pin jumper
    Learn More


Name Part Type Last Updated
Product Brief - BT510 Sensor All Product Brief 10/13/2021
AS/NZS Certifications - BT510 All Certification 12/18/2020
EU Certifications - BT510 All Certification 03/11/2021
FCC and ISED Certifications - BT510 All Certification 12/18/2020
Sentrius BT510 App - iTunes App Store All Legacy Material 12/16/2022
Sentrius BT510 App - Google Play All Legacy Material 12/16/2022
Sentrius™ BT510 User Guide All Documentation 10/30/2023
Release Notes - Sentrius BT510 v5.1.0 All Documentation 04/22/2021
User Guide - Repeater/Gateway Application All Legacy Material 12/16/2022
BT510 Zephyr Board File (External Link) All Software 05/28/2024
Application Note - BT510 Cloud Sensor Monitoring using Microsoft Azure Sphere All Legacy Material 12/16/2022
Application Note - BT510 Sensor Installation Guidelines All Application Note 02/19/2021
Regulatory Information - BT510 All Certification 02/24/2022
ISED ICES-003 Issue 7 Declaration of Compliance All Certification 05/18/2021
PCN 8H-2021 - BT510 Series All Documentation 09/07/2021
Application Note - Decoding BT510 BLE Temperature Advertisements All Application Note 02/03/2023
Hardware Guide - BT510 Sensor Firmware Development All Documentation 11/03/2023
PCN 5C-2024 - Sentrius BT510 Series All Documentation 06/03/2024


What happens when battery or temp sense is set to a zero value?

When the Temperature Sense Interval is set to 0, temperature measurements are stopped, although there will be 1 one more measurement when the value is changed.

When the Battery Sense Interval is set to 0, battery measurements are stopped. Note there is a power fail circuit built into the device that constantly monitors the battery level. Even if the Battery Sense Interval is set to 0, and the battery level drops below the failure level, a battery fail event will still be advertised.

How to Factory Reset BT510 loaded with legacy firmware?

There are two methods of doing BT510 Factory Reset.

Method 1: If the button is pressed for a duration exceeding 10 seconds and then released, the sensor will initiate a factory reset. This factory reset operation wipes out all stored logs, clears pairing information, and restores the configuration to its original settings. It takes approximately two seconds for the BT510 to reboot and become operational again after the reset, during which time it won't be able to detect button presses.

Method 2: You can do Factory Reset via nRF Connect for Mobile. This process is briefly explained in the User Guide in the Section 4.4, Example 6. Instead of the keyword “Reboot” you can use “Factory Reset.”
This is the JSON command that you can use: {"jsonrpc": "2.0", "method": "factoryReset", "id": 4}

What is the Project Zephyr Discord?

There's a Zephyr RTOS Discord channel.  This is a great place to ask questions and have them answered by the engineers who wrote the software.  There's even a channel for HL7800!

Project Zephyr Discord

How much flash memory does the BT510 have?

BT510 has 1MB internal flash memory. 

Using STTY with the USB-SWD

These instructions are intended for Linux or Macintosh OS. They may work using WSL, Cigwin, or other bash style terminals in Windows although this is untested. 

It may be desired to communicate with a device attached to the USB-SWD without terminal emulation, I.E. Picocom, Screen, Putty.  This can be useful for writing bash scripts, or if you're using Zephyr's "west flash" and would like a quick way to check your output. 

  1. Verify you have the program "stty" available using the command "which stty", if this does not return a value you will need to install it.  Fortunately "stty" generally comes standard with Linux and MacOS.  
  2. Identify your serial device.  This can be done using the command "dmesg -w" then connecting the USB-SWD.  You will see output like this (In Linux).
  3. (Optional) Assign the device name to a variable, for example "DEVICE=/dev/ttyACM0".
  4. Configure "stty" to talk with the device "stty -F $DEVICE 115200 -echo -echoe -echok"
  5. To see output from the device execute "cat $DEVICE &".  This will send serial communication from the device to Linux's standard output.  The "&" is to run this program in the background.
  6. Now press the reset button on the USB-SWD, you should see the output from your device.  In this example the Zephyr "Hello World" example has been flashed to a BT510. 
  7. (Optional) if you would like to send commands back to the device you can use "echo" or add an argument to your shell, "foo() { echo -n -e "$1\r" > $DEVICE; }".  Now commands can be issued directly from the command line, for example "foo "my_command"" will send the string "my_command" to the device. 

Can my BT510 measure vibration frequency with its embedded accelerometer?

As part of the default BT510 firmware developed by Ezurio, the accelerometer data is pretty binary:

  • Movement detected.
  • No movement detected.

The BT510 motion detection is done by comparing accelerometer data against an arbitrary threshold adjusted by a slider into the Sentrius BT510 phone application.

User-added image

Any overshoot of acceleration detected will trigger the event "Movement" which then will be advertised afterwards.

The default BT510 accelerometer use-case is mainly targeted to motion detection of an asset during a logistics supply chain. Customers can set the above threshold from 1 to 99 to adapt motion detection sensibility according to their needs.

If customers decide to develop their own firmware, they can have access to further data like acceleration value and orientation.
However, the ST LIS2DH sensor embedded into the BT510 doesn't include vibration frequency application:

User-added image

Hence it makes the BT510 not really suited for vibration frequency measurement applications.

How can I interface with a BT510 without the Mobile App?

The BT510 is an event driven BLE multi-sensors which is capable of measuring temperature, open/close magnet and motion detection. There is basically two ways to get data from it:

  • Advertisements
  • Connection

While the BT510 as been especially designed to transfer data via BLE advertisements, you can also use BLE connection to retrieve data. It's worth mentioning that preliminary intended use of BLE connection with the BT510 is for configuration (usually during commissioning process on the field). As exposed into the Sentrius™ BT510 User Guide section 4.2, the BT510 make use of BLE Virtual Serial Port (VSP) service.

The BL654 is BLE v5.1 module which embeds an nRF52840 chipset from Nordic. Ezurio developed smartBASIC, an event driven programming language that sits on top of Nordic SDK. Its most famous software/feature is the AT Commands Interface where you can drive a BLE module through UART with using batch of intuitive commands.

As part of IoT applications that involve to interact with a BT510 via BLE through a BL654 loaded with AT Command Interface, it can be useful to know the steps to get the BL654 connected to the BT510.

Because the BT510 GATT table is protected by a pairing process which involve static passkey (123456), it's important to change BL654 IOCAP in first instance to allow a Passkey entry procedure during pairing/bonding process.

On the BL654 side you'll need to follow the procedure below with AT Commands :

  • Change BL654 IOCAP setting either on 2 (Keyboard only) or 4 (Keyboard+Display)
  • Engage a non-VSP connection (AT+LCON)
  • Engage a pairing/bonding process with AT+PAIR 1
  • Issue BT510 passkey as part of the pairing/bonding process with AT+PRSP 1,123456
  • Disconnection from non-VSP connection (AT+LDSC 1)
  • Reconnect with VSP connection (ATD)

Now that both devices are connected with VSP mode, you can write JSON commands to send over BL654 UART in order to configure the BT510 as you like. For more information on JSON spec, you can have a look here :

A typical AT Commands session could look like this, where 01C630157769EE is a BT510 BLE Mac Address:

ATS 107=4 
AT+LCON 01C630157769EE
connect 1,01C630157769EE,15000,6000000,0
passkey? 1
AT+PRSP 1,123456
encrypt 1
discon 1,22

// BL654 is now bonded to BT510, VSP connection can be made.

ATD 01C630157769EE
CONNECT 0,01C630157769EE,15000,6000000,0

Where can I find Python example codes to leverage with my IG60-BL654 which shows how to interact with BT510?

We do have a dedicated Github page page that exposes Python examples code which undertake common operations between a BT510 and a BL654 loaded with smartBASIC AT Commands Interface.

It especially includes :

  • Sensor configuration
  • Analysing advertisements
  • Reading and decoding BT510 event logs
  • ... and many more!

These codes can be easily leveraged for any real world applications that would include BT510 mated with the IG60-BL654 or any other custom gateways.

You can find more information on the following page :

Can I use a different magnet to trigger the BT510 sensor magnet switch?

Technically any magnet with sufficient field strength and proper field orientation can be used.
The magnet sensor used in the BT510 is a magnetoresistive sensor and hence the sensitive axis is in the sensor plane (other than for hall sensors where the sensitive axis is perpendicular to the sensor plane). Below picture indicates the sensitive axis. The sensor is NOT sensitive to the direction of the field!

MR Magnet Sensor

More information about sensitivity and orientation recommendations from the sensor chip perspective is in the SM351LT data sheet. The below picture summarizes the most important aspects. It also shows the orientation of the sensor chip relative to the BT510 enclosure. The magnet coming with the BT510 is a rod-style magnet with axial magnetization and hence the field lines go from the short sides (top/bottom) of the magnet (more or less parallel) along the long sides of the magnet like indicated in the “magnet movement” section of the picture. This orientation ensures the field lines penetrating the sensor chip mainly along its sensitive axis. One can also see that rotating the magnet by 90° would lead to the field lines penetrating the sensor chip perpendicular to the sensitive axis and hence not generate any signal.

BT510 MR Sensor and Magnet Orientation

When selecting a different magnet than the standard BT510 magnet both field strength and orientation needs to be taken into account. A magnet with higher field strength can cover a larger operating distance to trigger the magnet switch. 

There exist a lot of standard round magnets on the market often used to stick/fix something onto metal surfaces and hence the magnetization is not critical and works for any magnetization type (like axial, vertical, diametrical…). However, often the magnetization type is not even specified for a particular magnet and cheap ones (like used for white boards) sometimes even have several magnetic poles in parallel over the area of the magnet. This actually helps for the common use-case of sticking well to metal surfaces but makes them quite unusable for reliably and reproducibly triggering a sensor chip.

How to best orientate your round magnet to get stable sensor near/far readings would depend on how the magnet is being magnetized and how the magnetic field lines would penetrate the sensor chip when applied. If the magnetization is unknown a magnetic field viewer (aka flux detector/viewer) can be used to "see" the magnetic poles and get the orientation of field lines.
The general advice would be to either use a rod-style magnet with axial magnetization in the above shown orientation or a round magnet with known magnetization type and then positioned in a way so that the field lines penetrate the sensor in its most sensitive axis. To ensure this, the magnetization of the magnet must be known before mounting.

What does Task 10 failed error mean when I'm using BT510 Legacy Firmware ?

Task 10 failed occurs when a firmware update fails. If you see this error please make sure you are using the latest version of the BT510 app and retry the firmware upgrade.

Is the BT510 sensor battery replaceable?

Yes, the BT510 Sentrius™ BT510 sensor is replaceable by removing the rear battery door cover.

The battery is a 3-volt lithium of CR2477 type.

The battery door cover has a gasket inside to keep out liquids.

How long will the sensor battery last if I use BT510 Legacy Firmware?

The Sentrius™ BT510 is a Bluetooth 5 Low Energy multi-sensor can last for months or years on its replaceable coin-cell battery. That battery life is dependent on lots of factors such as advertisement and event frequencies, PHY, sleep time, ambient temperature, and more.

To estimate how long your BT510 application can go on a single battery, adjust the values at the BT510 battery life estimator

It's good mentioning this battery life estimator stand for the BT510 Legacy Firmware only and is not relevant if customers develop their own custom firmware.

How can I extend the range of the BT510 Sensor?

The Sentrius™ BT510 sensors range is dependent on a number of factors some of which are under user control.
You can configure a sensor using a Bluetooth connection and the Laird virtual serial port(vSP) service. The protocol sent over the virtual serial port is JSON-RPC version 2.This allows you to add new commands and features without changing the Bluetooth interface.
This includes being able to configure

  • Tx power
  • LE Coded (Long Range) PHY

More details are available via the BT510 user guide.

It is also possible to extend the range of the BT510 using the Laird BL654 Repeater/gateway smartbasic programs this allows the Laird BL654 module to function as a repeater or gateway for adverts from Laird’s BT510 sensors. It can also operate in AT mode where it can advertise, scan, connect, and offer GATT client and server capabilities. This application is controlled with the industry standard AT command protocol over a UART interface.

  • BT510 Repeater Mode–The module listens for adverts from Laird’s BT510 sensors or other BT510 repeaters and rebroadcasts over the air so that a range extension can be facilitated. All other adverts are ignored.
  • BT10 Gateway Mode–The module listens for adverts from Laird’s BT510 orBT510 Repeaters and sends them out in hex format over the UART interface so that a host can process them. It could forward to the cloud if it has the appropriate connectivity. All other adverts are ignored.
  • Generic BLE Client/Server Mode–The module can be made to advertise, scan, connect, and pair. In addition, it can enable the creation of a GATT server table on-the-fly and, conversely can be a GATT client to interact with remote GATT servers.

More details are available via the BT510 Repeater/Gateway user guide.
The source code for all of these applications is hosted on our GitHub page:

Can I access the accelerometer data in the BT510 sensor?

The Sentrius™ BT510 advertises events. An event can be a temperature measurement, an alarm ,a battery measurement, a button press, a door opening/closing, or movement. The configuration of a sensor determines what kind of events it generates.

Access to accelerometer values is not possible but it is possible to configure the accelerometer sensitivity. You can configure a sensor using a Bluetooth connection and the Laird virtual serial port (VSP) service. The protocol sent over the virtual serial port is JSON-RPC version 2. This allows you to add new commands and features without changing the Bluetooth interface. The BT510 accelerometer creates a movement event.
More details can be found in the BT510 user guide.

Can the BT510 sensor use BLE LE Coded Phy (Long range)?


You can configure a sensor using a Bluetooth connection and the Laird virtual serial port(vSP) service. The protocol sent over the virtual serial port is JSON-RPC version 2. This allows you to add new commands and features without changing the Bluetooth interface.

This includes being able to change the PHY to LE coded for long range applications.
The Laird BT510 smartphone applications allows a user to select LE Coded PHY.
LE Coded PHY can also be selected from your own smartphone application using JSON over VSP BLE connections.
Details can be found in the BT510 user guide

Can I program the BT510 myself?

Out of the box the BT510 is configured via a smartphone app but this does not allow a developer to reprogram the BT510. However the BT510 can be programmed by a developer using Zephyr in C. More details can be found at the following link.

The Zephyr OS is based on a small-footprint kernel designed for use on resource-constrained and embedded systems: from simple embedded environmental sensors and LED wearables to sophisticated embedded controllers, smart watches, and IoT wireless applications.

Is there a programming cable available for the BT510 Sensor?

The BT510 sensor is configured using a smartphone via BLE out of the box. It is also possible for a developer to load their own C code onto the BT510 via a programming cable.

The BT510 board does not have an on-board J-Link debug IC as some nRF5x development boards, however, instructions from the Nordic nRF5x Segger J-Link; page also apply to this board, with the additional step of connecting an external debugger.

Ezurio will provide the USB-SWD programming board that supports this connector layout, refer to the USB SWD Programmer product page

What is the JSON string to change the TX power in the BT510 outside of the BT510 app?

The following string should be sent over VSP, where 8 is 8dBm

{"jsonrpc": "2.0", "method": "set", "params": {"txPower": 8}, "id": 1}
Valid values include:
-40 dBm, -20 dBm, -16 dBm, -12 dBm,  -8 dBm, -4 dBm, 0 dBm, +2 dBm, +3 dBm,  +4 dBm, +5 dBm, +6 dBm, +7 dBm, +8 dBm

See the user guide for further details.

Why am I not seeing temperature adverts from the BT510 sensor?

After factory defaulting the BT510 it enters shelf mode. Before configuring the BT510 sensor from the app you should press the button on the front of the sensor for 3 seconds to move it from shelf to active mode before configuration from the BT510 app.

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