SEIKAKU HJ-7188 Bluetooth Module
Introduction
HJ-7188 is an intelligent wireless audio data transmission product which is developed by our company with a low-cost & high-efficiency stereo RF transmission solution applied. It has high-quality sound, wide compatibility, and optimized overall performance based on the Built-in JL7016C chip used.
Due to Drive-free mode applied in HJ-7188, it is very quick for the user to realize the wireless transmission of music and enjoy music only when the module is connected to the user’s device, powered on, and connect the buttons.
Application Fields
As main usage of the BT device is to transmit music over short distances. It is easy to be connected to laptops, mobile phones, PDAs, and other digital products via Bluetooth to realize the wireless transmission of music.
Feather
- BT type: Module
- BT spec: Bluetooth V5.3
- Compatible version: V5.3/V5.0/V4.2/V4.2 LE/V4.0/V3.0/V2.1 + BR+EDR+BLE
- Operating current ≤30mA
- Standby current <0.4mA
- Operating voltage: 3.3v—4.5v
- Temperature range: -40ºC to +85ºC
- Communication distance： 10 meters
- Transmitting Power： +9dBm
- Sensitivity： -95dBm
- Frequency range： 2.4GHz-2.480GHz
- External interface： GPIO, SPI, USB, Speaker, Microphone
- Audio performance: High acoustic fidelity sound
- Audio SNR： ≥95dB
- THD ≤0.01%
- Measurement:25.0*15.3*1.0 mm
Dimension drawing of the module
Pin layout of the module
Schematic
The host manufacturer is responsible for compliance of the host system with the module installed, with all other applicable requirements for the system, such as Part 15. The host manufacturer is strongly recommended to confirm compliance with FCC requirements for the transmitter when the module is installed in the host.
Labelling
The proposed label format is to be placed on the module. If it is not visible when the module is installed into the system, “Contains FCC.
ID: XXXXXXXXX ” shall be placed on the outside of the final host system.
FCC Part 15 Statement
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the Federal Communications Commission (FCC) rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications to this equipment not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesired operation. Privacy of communications may not be ensured when using this device.
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SEIKAKU HJ-7188 Bluetooth Module- FAQs
Q1. What does a Bluetooth module do?
A Bluetooth module enables wireless communication between devices like phones, PCs, and IoT gadgets over the 2.4 GHz frequency range.
Q2. How do I enable the Bluetooth module on my device?
Go to Settings > Bluetooth & devices and switch Bluetooth On to activate the module.
Q3. How can I connect the Bluetooth module to a mobile phone?
Turn on the module, enable Bluetooth on your phone, and select the module from the available devices list to pair.
Q4. How do I test if the Bluetooth module is working?
Power it on, check for blinking LEDs, and scan for the device on your phone’s Bluetooth settings.
Q5. How do I troubleshoot connection issues?
Check wiring, ensure pairing mode is active, verify the correct baud rate, and try resetting or reconnecting with another device.
Q6. Can a Bluetooth module be reset or repaired?
Yes, you can reset it by turning Bluetooth off/on or using device settings. Software troubleshooting often fixes most issues.
Q7. What are the main types of Bluetooth modules?
They are mainly categorized as data transfer modules, audio modules, and combined audio + data modules.
Q8. Does Bluetooth work without Wi-Fi?
Yes. Bluetooth is independent of Wi-Fi and works for short-range wireless communication without internet access.