I believe that some people have had such a question when they understand Bluetooth. Is Bluetooth 4.0 and Bluetooth Low Energy the same thing? This statement is wrong. It is an absolute error in Bluetooth 4.0. The Bluetooth 4.0 standard includes two Bluetooth standards: one is the dual-mode standard, which includes traditional Bluetooth (or classic Bluetooth), high-speed Bluetooth, and low-power Bluetooth; the other is a separate low-power standard. This two parts apply to different application conditions and application environments.
Traditional Bluetooth (or classic Bluetooth) can be used for large amounts of data transmission, such as voice, music, etc., while low-power Bluetooth is mainly used in products with high real-time requirements but relatively low data rates, such as sensing. Equipment data transmission and remote control equipment.
Traditional Bluetooth has three power levels: Class1, Class2, and Class3, which support transmission distances of 100m, 10m, and 1m, respectively, while low-power Bluetooth has no power level, and generally has a transmit power of -21 to 5dBm. (Users can use software. Programming settings) For Bluetooth 4.2 or higher standards, there is no problem if the transmission distance is greater than 100m under open conditions.
Therefore, Bluetooth 4.0 integrates the three standards of traditional Bluetooth, high-speed Bluetooth and low-power Bluetooth, not just low-power Bluetooth.
About Bluetooth Low Energy
Bluetooth low energy, also known as smart Bluetooth, is an intelligent, low-power wireless technology. This technology further enhances its intelligence by reducing the size of smart devices and reducing their price and complexity.
Low-power Bluetooth was initially part of the Bluetooth 4.0 core specification. The initial goal was to provide the lowest power wireless standard and was optimized for low cost, low bandwidth, and low power consumption. Currently, low-power Bluetooth technology has been widely used and can run for a long time with just a button battery.
Low-Power Bluetooth and Other Bluetooth Compatibility Diagrams
The low-power Bluetooth solution solves the communication between the mobile phone and the mobile device, and can transfer relevant data to the cloud for storage, and at the same time can also perform corresponding expansion and realize more value-added services.
*The HY254124PA module* adopts TI CC2541 highly integrated single-mode Bluetooth BLE 4.0 chip. The module can work under the role of master/slave/master/slave switch. The module will automatically broadcast after the initial setting. The mobile phone that has opened a specific APP will After scanning and docking, it can be monitored through the BLE protocol. At the same time, the built-in FLASH program memory is suitable for customized applications to better protect application security.
General features:
Product Model:HY-254124PA
Wireless standard: Bluetooth 4.0 BLE protocol
Size: 25.1*12*2.04mm
Communication Interface: UART/SPI/IIC
Transmit power: +15dBm (direct test of antenna output RF coaxial cable)
Power control range: 20dB (software programmable)
Receiver sensitivity: -94dBm (using CC2541 high-gain receiver sensitivity)
Antenna type: soft antenna
Transmission distance: 110 meters (actual distance to the test environment)
Operating voltage: 2.0-3.6V DC
Working mode: Host mode / Slave mode / Broadcast mode (Beacon)
Secondary development: support customers for secondary development and provide SDK tools
Cross flow fans are mainly used for air conditioners, air curtain equipment, dryers, dry-type transformers, household appliances and equipment on grain combine harvesters
Service conditions of transformer cooling fan:
1. The ambient temperature shall be+75 ℃ ≥ - 40 ℃.
2. The industrial gas passing through the cooling fan is not allowed to have strong acid, strong alkali and various solutions.
3.Sand and dust and other sundries are not allowed to fall into the fan, so as to avoid fan burning and fan blade breakage.
Working principle
When GF series cooling fan is used for dry-type transformer, the fan is placed on both sides of the coil, and the cold air is directly blown into the high and low pressure cooling air passages of the dry-type transformer coil, which has obvious heat dissipation effect, ensuring the normal operation of the dry-type transformer and prolonging its service life. Fan start stop, transformer overtemperature alarm, overtemperature trip and other functions are provided by the temperature control device.
Maintenance and use
1. Before the fan is used, the insulation resistance shall be tested to be greater than 2 megohms. When the fan is hot or humid, the insulation resistance shall not be less than 0.5 megohms.
2. Before starting the fan, please check whether the appearance is intact, whether the connection is reliable, and whether the wind wheel rotates flexibly without blocking.
3. Clean the dust in the fan regularly to prevent affecting the air volume.
Cross Flow Cooling Fan,Copper Cross Flow Fan,Transformer Cooling Fan,Top Blowing Series Cooling Fan
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