[Fréquence]:2,4 GHz
[Protocole de communication]: BLE 5.3
[Portée de communication]:150 m
[Type d'antenne]:PCB intégrée
[Dimensions]:10*14.5mm
[Poids]: 0,5 ± 0,1 g
[Introduction]:The E104-BT56 series modules are serial-to-BLE Bluetooth modules designed based on the Bluetooth 5.3 protocol. They support Master, Slave, Master-Slave (Dual-role), and Observer modes, accommodating up to 8 simultaneous connections. These modules also support features such as low-power advertising, transparent data transmission, over-the-air (OTA) configuration, and OTA updates, making them suitable for applications in smart wearables, home automation, and more.
| Serial Number | Pin Definitions | Pin direction | illustrate |
| 1 | GND | - | power ground |
| 2 | NC | - | Users don't need to worry, it's suspended. |
| 3 | RESTORE | enter | After the internal pull-up switch is held low for at least 5 seconds, all parameters are reset to factory settings and the module automatically restarts. |
| 4 | DATA | Output | Data output indication: A high-level signal is output upon receiving BLE data over the air, and a low-level signal is output after the BLE data has been transmitted via serial port. |
| 5 | LINK | Output | Connection status indicator pin: high level indicates connected, low level indicates disconnected. |
| 6 | NC | - | Users don't need to worry, it's suspended. |
| 7 | RESET | enter | Reset pin, low level reset |
| 8 | WRP | enter | The default low level indicates normal mode, during which serial communication is possible. Pulling it high enters sleep mode, and serial communication is disabled. (Edge triggered) |
| 9 | RXD | enter | Serial port input |
| 10 | TXD | Output | Serial port output |
| 11 | GND | - | power ground |
| 12 | VCC | enter | Positive power supply, 1.8V~3.6V, 3.3V power supply recommended. |
| 13 | NC | - | Users don't need to worry, it's suspended. |
| 14 | NC | - | Users don't need to worry, it's suspended. |
| 15 | LOG_TX | Output | Log serial port output is disabled by default; it can be left floating if not used. |
| 16 | NC | - | Users don't need to worry, it's suspended. |
| 17 | NC | - | Users don't need to worry, it's suspended. |
| 18 | GND | - | power ground |