ALSENSE ALS Tire BLE User manual

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ALS Tire BLE
Install Guide
(18.06.2022)
V1.0 – Initial version
www.alsense.eu

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Table of Contents
ALS Tire BLE 1
www.alsense.eu 1
1. Introduction 3
2. Specifications 3
3. Quick Install 4
a. Initial Setup 4
b. Configuration 4
c. Power-up 4
d. Sleep Mode 4
4. Physical Installation 5
5. Mobile Installation 8
6. Operation & Charging 10
7. Factory Reset 10
8. Configuration 10
9. Troubleshooting / FAQ 12
10. Support 13
Appendix A: ALS Tire BLE 14
Bluetooth Communication Protocol V2.0 Updated 23.01.2022 14
Overview 14
Device Naming 14
Bluetooth Services and Characteristics 14
Temperature Characteristic 14
Configuration Characteristic 14
Current Protocol Version 15
Protocol Version 2 15
Temperature Service 15
Temperature Characteristic Packet 15
Configuration Characteristic Packet 16

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1. Introduction
Thank you for purchasing the ALS Tire BLE. The following guide is aimed at providing an overview
of the typical install process and configuration steps.
2. Specifications
SENSOR
Number of Channels
3 (3 default)
Sample Rate 1-10Hz (10Hz default)
FOV 110°
Battery
250 mAh (built-in charger)
Autonomy
15 hrs (track use)
Dimensions
64 x 42 x 17.5 mm
Accuracy
1°C
Emissivity 0.01 – 1 (0.75 default)
IP Rating IP65

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3. Quick Install
a. Initial Setup
First step after receiving the product is putting the sensors on charge using the supplied cables and
any USB adapter (including external batteries).
b. Configuration
Full information on configuring the parameters of the units can be found in section Configuration
c. Power-up
The system can now be powered up. To power up the device remove it from the magnetic enclosing.
Once removed the device automatically boots up, the STATUS LED on the device should turn blue
and, after the initialization period passes, it switches off. This signals that the device is ready for
transmitting data over BLE.
d. Sleep Mode
The device will be advertising itself on Bluetooth for 15 minutes, after this period if no connection
is received then it will enter a sleep mode for 1 hour and then wake up and re-advertise. Any BLE
connection to the device will reset this timer. The device will repeat this pattern until the battery is
depleted. Use a magnetic override or pad to wake up the device if it has entered sleep mode(check
the STATUS LED on wake-up to make sure the battery is not depleted).

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4. Physical Installation
Figure 1 – Mounting (sensor – left, receiver –
right)
The sensor should be mounted in its final position using the mounting holes situated on the sides
of the housing. For temporary installs we’ve successfully used 3M Dual-Lock tape, but extra care
should be employed when using such a solution.
We do recommend placing the sensor on the tire’s leading edge (so as to not get hit by debris) and
avoiding direct exposure to significant heat sources (i.e. exhausts).
The IR sensor has a horizontal FOV of 110°. As the sensor is placed further away, the maximum
width of the tire increases. Please consult the table and the graph below or get in touch if you have
any questions. Please consult ‘Figure 2’ in order to determine how to orient the sensor.
For best wireless range please ensure that the receiver and sensors are all oriented
vertically.

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Maximum Tire Width (mm)
Mounting Distance (mm)
100
35
150
52
225
79
250
88
275
96
300
105
350
123
400
140
Figure 2 - Channel assignment / sensor data order

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Figure 3 - Visual Representation of channel assignments

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5. Mobile Installation
A. Harry’s Lap Timer or GPS/OBD Buddy (iOS / Android)
Connecting to the device:
1. Download the latest version of the application.
2. If you have GPS/OBD Buddy, buy the Tires view add-on to be able to see the tire
temperatures.
3. Open the application and go to the
Tires view:
4. The device will connect automatically if
powered-on:

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Configuring the device:
1. Go to Administration:
2. Go to Sensor List:
3. Click on the Alsense sensor: 4. Modify the configuration and click Set.

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The Configuration is validated by the sensor, and if not valid it will not be applied. Check the
Configuration section and the Appendix for more info about the valid values.
6. Operation & Charging
Each sensor has a 250mAh battery that can be charged using the built-in connector. When in use,
it allows for up to 15 hours of track time.
Charging is done using the cables supplied from any USB port. External batteries can be used as
well. A full charge takes around 90 minutes.
Preserving battery life when not in use – while active, the sensors continuously send data,
draining the battery. When not in use, they can be deactivated by placing a magnet in a similar
position to the ones in the charging dock. Alternatively, the sensors can be placed in their carrying
case which has the magnets pre-fitted.
Demo units need to be placed in the charging dock or magnetically deactivated while
charging!
7. Factory Reset
In some scenarios you might need to reset configuration parameters of the sensors. The
following scenarios are instances when a factory reset is required:
-Current settings are no longer working for you
Factory resetting a sensor
-Ensure it is powered(STATUS LED has flashed blue and has turned off) and has enough
battery life.
-Make sure no magnetic override is present.
-Press & hold the control button (S1) for around 10s.
8. Configuration
If you haven’t requested a custom configuration for the sensors in your order, the default
settings are as follows, along with a short description of what their function is:
Parameter
Default Value
Function
Emissivity
0.75 Lowering the emissivity

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increases the tire temperature.
Suggested values depending
on mounting distance:
●50mm – 0.86
●150mm – 0.8
●200 – 0.77
Accepted values(1 is 0.01):
1-100
Sample Rate
10 Hz
Sampling and reporting rate
for the sensor.
Accepted Values:
1-10
Sensitivity
12
Accelerometer sensitivity.
Accepted Values:
10-20

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9. Troubleshooting / FAQ
Situation 1: Mobile application does not find the device
a. Make sure the sensor has been fully charged.
b. Bring the sensor near the receiver. Try resetting it using the magnetic override.
c. Turn Off and then On the mobile Bluetooth. The BLE stack might be corrupted and this
helps reset the stack.
d. Turn Airplane mode On and then Off on your mobile. The BLE stack might be corrupted
and this helps reset the stack.
e. Try bringing it back to factory settings using the steps described in section Factory Reset

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10. Support
Please make sure to check the downloads section of our support page as it provides the product’s
datasheet and configuration files for the most common CAN dashboards/loggers. Extra help can
be obtained using our built-in ticket support system or directly via phone.
Downloads: https://www.alsense.eu/downloads/
Support Tickets: https://alsense.eu/osticket/ or email [email protected]
Phone: [phone]

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Appendix A: ALS Tire BLE
Bluetooth Communication Protocol
V2.0
Updated 23.01.2022
Overview
This document describes the communication protocol of the Alsense Tire Temperature Bluetooth
low energy product.
Device Naming
The device name has the following convention: “ALS Temp BLE XXXXXX Y”. Where “XXXXXX” are the
last 3 bytes of the MAC address and “Y” is the position(see configuration characteristic for more
details).
Example: For MAC address “00:60:37:31:F7:B5“ and position “Rear Left”, the name will be: “ALS
Temp BLE 31F7B5 3”.
Bluetooth Services and Characteristics
The board exposes a BLE service, for interacting with it, called “Temperature Service” . The
Temperature Service has 2 characteristics: Temperature Characteristic and Configuration
Characteristic.
The UUIDs for the services and the characteristics are:
Temperature Service e10d0100-54da-44b3-9b70-9b9898e9ba43
Temperature Characteristic
e10d0101-54da-44b3-9b70-9b9898e9ba43
Configuration Characteristic
e10d0102-54da-44b3-9b70-9b9898e9ba43
Temperature Characteristic
The Temperature Characteristic is used to report battery and temperature data readings.
Characteristic Properties: Read/Notify
Configuration Characteristic
The Configuration Characteristic is used to change the board’s configurations.
Characteristic Properties: Read/Write/Notify

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Current Protocol Version
The current protocol version is Version 2.
Protocol Version 2
Temperature Service
Temperature Characteristic Packet
Field
Size
(bytes)
Description
Values
Protocol
Version
1
The current protocol version.
2
Battery Level
1
The battery level in percentage.
0-100
Number of
Channels
1
The number of channels.
1-3
Payload
32
The channel temperature values (Number of Channels x
2 bytes).
Examples:
- for 3 channels we will have a payload of 3 x 2 = 6 bytes
and a padding of 26 bytes which are not used.
- for 2 channels we will have a payload of 2 x 2 = 4 bytes
and a padding of 28 bytes which are not used.
Each value is stored in 2 bytes and it is sent as a signed
short value.
Each value has a multiplication factor of 10.
Examples:
- 33.5 will be encoded as 335.
- 124.2 will be encoded as 1242.
- -10.5 will be encoded as -105.
-32767 -
+32767
The length of this packet is 35 bytes.
The usable packet length is 9(1 + 1 + 1 + 3 * 2) bytes. The rest of the bytes are not used, but might
be used in future releases if the channel count increases.

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Configuration Characteristic Packet
Field
Size
(bytes)
Description
Values
Default Values
Protocol
Version
1 The current protocol version. 2 2
Number of
Channels
1
The number of channels.
1-3
3
Sample Rate
2
The sample rate in Hz.
1-10
10
(when waiting for
movement the value is
always 1)
Sensitivity
2
The accelerometer sensitivity.
10-20
12
Emissivity 2 The temperature infrared sensor
emissivity(in .01 increments).
1-100 75
Sensor
Position
1
Position of the sensor.
One of:
1 - Front Left
2 - Front Right
3 - Rear Left
4 - Rear Right
1-4
1
Unused 11 Reserved for future use. N/A N/A
The length of this packet is 20 bytes.
The device checks the configuration ranges and rejects the configuration change if the values are
not in the ranges from the table from above.
For more details visit our website.