HC-04 Bluetooth-compatible 5.0 Module HC04 Dual-mode SPP2.1+BLE5.0 Serial Port Module Replace HC-05 HC-06 HC-08

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1Here is some English documentation for the HC-04 Bluetooth serial communication module: IntroductionThe HC-04 is a Bluetooth serial communication module that can be used to connect two devices over a Bluetooth connection. It is a popular choice for projects that require wireless communication, such as remote control, home automation, and data logging.The HC-04 has a number of features that make it a versatile and reliable module, including:Support for a variety of baud rates, up to 115200bpsSupport for encryption and authenticationLow power consumption SpecificationsOperating voltage: 3.3V-5VOperating current: 20mATransmitting power: +5dBmReceive sensitivity: -90dBmBaud rate: 9600bps, 19200bps, 38400bps, 57600bps, 115200bpsEncryption: 128-bit AESAuthentication: 128-bit shared secret PinoutVCC: Power supply inputGND: GroundTXD: Transmit dataRXD: Receive dataEN: EnableKEY: Key WiringThe HC-04 is a relatively simple module to wire. The only required connections are the power supply, the transmit data, and the receive data. The enable and key pins are optional and are used for advanced features.To wire the HC-04, simply connect the VCC pin to the power supply, the GND pin to ground, and the TXD pin to the transmit data pin of the other device. The RXD pin is connected to the receive data pin of the other device. AT CommandsThe HC-04 can be configured using AT commands. AT commands are a set of standard commands that can be used to control the behavior of the module.To enter AT command mode, hold down the KEY pin while powering on the module. The LED will flash to indicate that the module is in AT command mode.Once the module is in AT command mode, you can send AT commands using a serial terminal program. The following is a list of some of the most common AT commands:AT: Returns the version number of the moduleAT+NAME: Sets the name of the moduleAT+PSWD: Sets the password for the moduleAT+BAUD: Sets the baud rate of the moduleAT+CMODE: Sets the communication mode of the moduleAT+ROLE: Sets the role of the moduleAT+PAIR: Pair the module with another deviceAT+CONNECT: Connect to another deviceAT+DISCONNECT: Disconnect from another device

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