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bluSensor® Bluetooth Low Energy API
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bluSensor® Bluetooth Low Energy API


You can use any Bluetooth Low Energy API to access sensor data, download logged data, configure alarms, and much more on our bluSensor® devices.

For more information how to use Bluetooth Low Energy on your platform we refer to the platform’s API documents.

Bluetooth Low Energy SDKs

Official Bluetooth SIG ID

Almendo Technologies GmbH (0x06E8)

Please find our official ID here: Bluetooth - Company ID


Service UUIDs

bluSensor® devices are using the following unique service UUIDs


Advertisement Scan Record

All our sensors are broadcasting sensor data using manufacturer specific data.

To filter for bluSensor® devices during discovery you can use the service UUID that is part of the Scan Record. Please note that using scan filters on Android is buggy and it is better to implement your own filter mechanism using the provided UUID from the Scan Record.

Service UUID (Scan Record)


Manufacturer Specific Data (Scan Record)

bluSensor® devices (1st generation)

sensor type alarm code sensor data
1 byte 1 byte variable bytes

bluSensor® devices (2nd generation)

company ID company ID device type sensor type alarm code sensor data
0x06 0xE8 1 byte 1 byte 1 byte variable bytes

Device Types

device type description
01 Bluetooth Low Energy (BLE)
02 WiFi and BLE (IoT Sensor)
03 WiFi and BLE (MQTT Sensor)

Sensor Types

sensor type description
01 Humidity & Temperature
02 Accelerometer
03 3D Fusion (Euler)
04 Air Flow
05 Ambient Light
06 Accelerometer, Magnetometer, Gyroscope
07 Accelerometer (Low Energy)
08 ShakeIt Sports Tracker
09 Air Quality (Industrial)
10 Air Quality
11 Usage Counter
12 Temperature Probe (PTC)
13 Temperature Probe (NTC)
14 Infrared Array Camera
15 Particulate Matter
16 Distance
17 Ambient Light
18 Highspeed Magnetometer
19 People Presence Detector
20 People Counter
21 Distance Counter

Advertisement Alarm Codes

bluSensor® devices

alarm code description
00 no alarm
01 alarm active


Device Information Service


Please find official specification here: Bluetooth - Device Information Service

Battery Service


Please find official specification here: Bluetooth - Battery Service

bluSensor® Service


All bluSensor® devices implement the following characteristics. The logger functionality needs some configurations to be opertional. See details below.

Sensor Data

  • PROPERTIES: read/notify
  • LENGTH: 4 bytes
  • FORMAT: measurement (see how to convert sensor data section below)


  • PROPERTIES: write
  • LENGTH: 1 byte
  • FORMAT: 0x01 for blink

MAC Address

  • PROPERTIES: read
  • LENGTH: 6 bytes
  • FORMAT: Mac Address Bytes XX:XX:XX:XX:XX:XX


The logger of bluSensor needs some configurations to be operational. The configuration steps are.

Enable Logging

  1. set time reference from your smartphone
  2. configure logger interval
  3. enable logging

Download Log

  1. listen to notifications on sensor data characteristic on your smartphone
  2. start sending log data by using logger control characteristic
  3. store ordered measurements on your smartphone (4-byte chunks)

Build Log Timestamps

  1. calculate timestamp for each measurement using time reference
  2. 1st measurement = time reference
  3. 2nd measurement = time reference + logger interval
  4. 3rd measurement = time reference + logger interval * 2
  5. and so on...

Logger Time Reference

  • PROPERTIES: read/write
  • LENGTH: 4 bytes
  • FORMAT: any reference timestamp that your app can handle. You need this timestamp later on to calculate the timestamps of each individual measurement.

Logger Interval

  • PROPERTIES: read/write
  • LENGTH: 2 bytes
  • FORMAT: interval in seconds. It is mandatory to use a logger interval of 5min/10min/15min/30min. You CANNOT use any other interval!

Logger On/Off

CHARACTERISTIC: a8a82633-10a4-11e3-ab8c-f23c91aec05e
  • PROPERTIES: read/write
  • LENGTH: 1 byte
  • FORMAT: 0=OFF 1=ON

Logger Control

  • PROPERTIES: write
  • LENGTH: 1 byte
    • 1=SEND (sends log via Logger Data Characteristic)
    • 2=RESET (delete data and stop logger)
    • 3=REBOOT (reboot device and stop logger)

Logger Data

  • PROPERTIES: notify
  • LENGTH: 16 bytes
  • FORMAT: 4 measurements each 4bytes long are sent (see previous chapter for format)

Logger Flash Size

  • PROPERTIES: read
  • LENGTH: 4 bytes
  • FORMAT: size of flash memory in bytes

Logger Usage

  • PROPERTIES: read
  • LENGTH: 4 bytes
  • FORMAT: size of used flash memory in bytes

Converting Sensor Data

Humidity & Temperature

The sensor data is 4 bytes and can be converted using the following mechanism and formular.

int hum = (data[2] & 0xff) | ((data[3] << 8) & 0xff00); 
float relHum = -6.0f + 125.0f * (float) hum / (float) 65536;
int temp = (data[0] & 0xff) | ((data[1] << 8) & 0xff00);
float tempC = -46.85f + 175.72f * (float) temp / (float) 65536;


0100ac667a63 => 42.5% and 23.5°C

SDK Documentation coming soon:

  • Accelerometer
  • 3D Fusion (Euler)
  • Air Flow
  • Ambient Light
  • Accelerometer, Magnetometer, Gyroscope
  • Accelerometer (Low Energy)
  • ShakeIt Sports Tracker
  • Air Quality (Industrial)
  • Air Quality
  • Usage Counter
  • Temperature Probe (PTC)
  • Temperature Probe (NTC)
  • Infrared Array Camera
  • Particulate Matter
  • Distance
  • Ambient Light
  • Highspeed Magnetometer
  • People Presence Detector
  • People Counter
  • Distance Counter

Development Tools

There are many tools available for iOS and Android that you can use for testing and development.

Here are some of the tools available:

  • BLExplr (iOS)
  • LightBlue Explorer (iOS and Android)
  • nRF Connect (iOS and Android)
  • Blue Gecko (iOS and Android)

Compatible Apps

Purchase Sensors

You can buy sensors and development kits in our online shop at


Having trouble with bluSensor® API or need development support?

You will get direct support from our core development team (free of charge)!

You can contact us anytime at

You need a sensor type that is not listed yet?

Just drop us an email!


Unfortunately, Android's BLE API is much less convenient than its iOS counterpart. Here is a short summary what you need to consider:

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