Bluetooth technology | new working mode of wearable devices of the Internet of things, and Bluetooth ble helps the new working mode

KTH The Royal Institute of technology is located in Stockholm, the capital of the kingdom of Sweden , It is currently the largest in Sweden 、 The oldest Polytechnic institution , It is one of the members of the Nordic five school alliance ）, Scientists put forward in the report , They are about to develop a way to replace batteries , Serve the Internet of things (IoT) Low power applications and wearable devices in . The answer appears in the form of ink coating , It is allowed to convert the low-level heat generated by the equipment into electrical energy .

Thermoelectricity is called converting heat directly into electricity . It is feasible to capture the heat generated by the equipment and convert it into energy that can be used by the same equipment or other equipment . What is needed is thermoelectric materials with unique design .

When one end of the thermoelectric material tends to heat up , Charge carriers （ Electrons and holes ） Tends to shift from the hot end to the cold end , This produces an electric current . One difficulty is to adjust resistance and thermal conductivity with materials that can be used in a wide range without losing performance over time .

KTH Professor of material chemistry Muhammet Toprak Express , The research carried out by his team focuses on the design and development of hybrid thermoelectric materials for room temperature operation . This combines solid-state semiconductors with adaptive materials such as polymers , To design ink .

Bluetooth Technology Alliance （SIG） Launched low-power Bluetooth （BLE） technology , It is regarded as a short-range wireless communication standard with the lowest power consumption . Like classic Bluetooth ,BLE Also have 1Mbps Bandwidth 2.4GHz ISM Working in frequency band .BLE The most notable features are as follows ：

Low data rate - Ideal for applications that only need to exchange status information .
The protocol can transmit short messages in a fixed time interval , Therefore, the host is in low power consumption mode when no information is sent .
The protocol reduces the time required to establish a connection to data exchange to a few milliseconds .
Each layer in the architecture has been carefully optimized to reduce power consumption
The modulation index of the physical layer is increased compared with the classical Bluetooth , It helps to reduce the sending current and receiving current .
The optimized link layer enables fast reconnection , To reduce power consumption .
The controller can realize various key tasks , For example, establishing a connection and ignoring replicated packets , Therefore, the host can be in the low power consumption mode for a longer time .
Adopt a robust and reliable architecture similar to classic Bluetooth , Support adaptive frequency hopping , have 32 position CRC Check function .

BLE The protocol can be perfectly applied to wearable devices , Here's why ：

The protocol is carefully optimized for ultra-low power consumption .
Low power consumption helps reduce battery size , Thus reducing product costs 、 Size and weight .
Due to the use of BLE Intelligent ready host , Therefore, it is convenient to implement the protocol .
Wearable devices exchange a small amount of burst information in a long time interval .
Lenz technology has independently developed wireless RF and low-power Bluetooth BLE5.2 Chip and has global intellectual property rights , in the light of AIoT Internet of things and individual consumers , Provide Bluetooth master fully integrated chip 「 Commonality of software and hardware 」 Solutions and core devices , Supporting all-round APP Software platform customization development . The Bluetooth chip scheme is applied to intelligent wearable devices 、 Bluetooth indoor navigation 、 Smart home 、 Health care 、 Sports build body 、 The data transfer 、 Remote control 、 Personal peripherals and AIoT Internet of things and so on .

The latest launch is equipped with high performance and low power consumption 32 Bluetooth chip of bit processor ST17H66（SOP16）, Support BluetoothLE、SIG MESH Multifunctional Bluetooth 5.2.

The key parameters ：

256KB System flash
64KB SRAM, In sleep mode, all data remains constant
2.4 GHz Transceiver
Bluetooth Low Energy
Bluetooth Mesh
-20dBm to +10dBm Transmitting power
Receiving current ：8mA
Emission current ：8.6mA
[email protected](IO wake up only)
AoA/AoD Azimuth determination
AES-128 Hardware encryption
PDM/I2C/SPI/UART/PWM/DMA