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1. How many maximum does the Bluetooth module connect with cell phones or other Bluetooth module ? Feasycom Bluetooth module maximum supports up to 17 connections , the 7 connections is the classic Bluetooth , and another 10 connections is the BLE Bluetooth. 2. Do we have the development board of the Bluetooth module ? Yes , we have three types development board: Serial development board , USB development board and Audio evaluation board , the Serial development board is FSC-DB004 , it could used for FSC-BT826 , FSC-BT836 , FSC-BT616 and FSC-BT816S , USB type is FSC-DB005 development board , it could used for FSC-BT816S , FSC-BT826 , FSC-BT836 and FSC-BT616 , the Audio evaluation board has ,FSC-DB101 , and FSC-TL001three model , FSC-DB001 could used for FSC-BT802 , FSC-BT803 , FSC-BT502 and FSC-BT909 , FSC-DB101 could used for FSC-BT906 and FSC-BT926 , you could also check it on our website o contact us directly . 3. When designing the PCB board , how to put the antenna could get the highest performance ? The antenna shall be placed on the edge of the plate. The position of the antenna shall not be covered with copper or any wire. The distance between the antenna and the surrounding parts shall be at least 5mm. The specific description can be seen in the description of the corresponding module model specification, which has a detailed layout diagram. 4. What`s the advantages of dual mode Bluetooth module ? Mobile phone in the market mainly divided into IOS and android currently .Data communication between IOS devices and Bluetooth peripherals could transfer data by BLE (iPhone4S and later) or by classic Bluetooth SPP (apple MFi certification is required). The Android system starts to support BLE from version 4.3. However, due to system fragmentation, most Android phones on the market have poor support compatibility for BLE, so it is recommended to use classic Bluetooth SPP for data communication. Arrows RC airplane Atten soldering gun FMS RC jet Kerui GSM alarm Freewing RC jet When products need to support both IOS and Android devices, Bluetooth dual-mode products are the mainstream choice in the current market. 5. How does the transmission distance of the Bluetooth module could up to ? The Class 2 standard transmission distance defined by the Bluetooth specification is about 10 meters, and the Class 1 transmission distance could reach than 100 meters. 6. What is the transmission rate of classic Bluetooth SPP and BLE? In an ideal situation: SPP: About 80KBytes/s BLE: About 8KBytes/s ( Noticed: When the audio transmission is turned on at the same time, the speed will be greatly reduced.The BLE transmission rate is about 1~2KBytes/s when playing music.

Our default firmware is slave mode, you can look the status by sending command AT+PROFILE. AT+I2SCFG=1 I2S will be configured as master mode If connected with HFP, the parameters will be 8K, 16bit If connected with A2DP, the parameters will be 48K 16bit or 44.1K 16bit. In our next version, it will be fix to 48K 16bit. AT+I2SCFG=3 I2S will be configured as slave mode. The detailed steps:Arrows RC airplane Atten soldering gun FMS RC jet Kerui GSM alarm Freewing RC jet If you need connect to HFP 1. AT+PROFILE=83 2. AT+SCAN=1 for example your Bluetooth address is DC0D3000142D 3. AT+HFPCONN=DC0D3000142D 4. If you see the feedback +HFPSTAT=3, it means connect successfully. 5. AT+HFPAUDIO=1 Then the audio link will be established. Logic analysis to capture I2S signal, you can see 8K 16bit waveform

This brief introduction is to answer basic questions about how bluetooth low energy (BLE) beacons works well as their capabilities and limitations. The technology behind these. Beacon devices is also referred to as ``Bluetooth beacon``, ``Smart Beacon``,[Proximity Beacon",[Eddystone Beacon". Beacons are sometimes misunderstood as instruments of [surveillance"`,capable of tracking smart phone owner`s movements. This is incorrect. Beacons transmit a low-energy signal that can be picked up by nearby bluetooth-enabled mobile devices, including smart phones. Beacons themselves don`t collect data. They broadcast signals that can be detected by apps on mobile devices .Then the smart phone within beacon`s working area will received the notifications. Retail-store beacons can helps owners attract local traffic, grow customer engagement, encourage repeat business and increase sales for small and medium businesses. Museum beacons can show detail information about the artist. Library beacons can be used to remind users about overdue books. Beacons signals will be received when user`s cellphone has already turn it is bluetooth on . For Eddystone (URL/UID) broadcast, user can use free Nearby/Physical Web for receiving notifications. For iBeacon broadcast, users need Physical Web or a mobile app for receiving notifications. Android phone system comes with nearby,therefore Eddystone (URL/UID) broadcast will be received directly by android cellphone but iBeacon broadcast will be received when user already install Physical Web or mobile app. By the way Nearby only scan beacons when the users turn on their smart phone`s screen. Therefore the notification might not appear until the user interacts with their android smart phone. If your notification is not performing well (users rarely tap on it, or ignore it, which can be interpreted as the notification being not that useful), Nearby Notifications might stop delivering it to the users. iOS cellphone users need install Physical Web or mobile app for receiving all kinds notifications :Eddystone (URL/UID) broadcast and iBeacon broadcast. And Device owners must also have enabled use of Bluetooth. Arrows RC airplane Atten soldering gun FMS RC jet Kerui GSM alarm Freewing RC jet

The 3 main codecs that most listeners are familiar with are SBC, AAC and aptX: SBC - Subband Coding - The mandatory and default codec for all stereo Bluetooth headphones with the Advanced Audio Distribution Profile (A2DP). It is capable of bit rates up to 328 kbps with a sampling rate of 44.1Khz. It provides fairly good audio quality without requiring a lot of processing power to encode or decode. However, the audio quality can be a bit inconsistent at times. This is especially noticeable with a cheap Bluetooth transmitter. AAC - Advanced Audio Coding - Similar to SBC but with a better sound quality. This codec is mostly popular with Apple's iTunes platform and some other non-wireless applications. However, it's not very common, especially for headphones. aptX - A proprietary and optional codec designed by CSR. It's ideal for demanding audio applications since it encodes audio more efficiently and at a slightly higher rate than SBC. There are also two additional variation aptX(LL) and aptX HD that either drastically reduces the latency of the connection or significantly improves its audio quality. However, it's a bit limiting as both the Bluetooth transmitter and receiver must have aptX or its variations for the codec to work. Arrows RC airplane Atten soldering gun FMS RC jet Kerui GSM alarm Freewing RC jet [