EWM104-BT41SX Serial Port to Dual-Mode Bluetooth Module IPEX 3 Antenna BLE 5.4 SPP dual modes UART Master-slave integrated transparent transmission
[Communication Interface]：UART
[Operating Frequency]： 2.4GHz
[Bluetooth Protocol]：BLE 5.4
[Communication distance]：200m
[Size]：10*10mm
[Product weight]：0.8±0.1g
[Introduction]：The E104-BT41SX module is a serial-to-dual-mode Bluetooth slave module based on Bluetooth 5.4. It supports both SPP and BLE protocols, operates in the 2.4 GHz frequency band, and can switch between BLE and classic Bluetooth. The module has a maximum transmit power of 8dBm and supports AT command configuration, making operation simple and fast. This module enables wireless data transmission between traditional low-end serial devices or MCU-controlled devices. It is a low-cost, easy-to-use, and reliable data transmission module.
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| Pin number | Pin Definition | Pin direction | Pin Function | illustrate |
| 1 | GND | - | Power ground | land |
| 2 | PA8 | - | - | Reserved interface |
| 3 | PA7 | input | RESTORE | Internal pull-up, falling edge, and then maintaining a low level for at least 5 seconds, all parameters are restored to factory settings and the module is automatically restarted. |
| 4 | PA2 | - | - | Reserved interface |
| 5 | PA1 | Output | Status Indicator | Connection status indication, high level indicates connected, low level indicates disconnected |
| 6 | PA0 | input | - | Reserved interface |
| 7 | RST | input | Reset pin | Low level reset |
| 8 | WKP(PB6) | input | Wake-up pin | The default is low level, low power mode, and all broadcasts are turned off. Pull high to input normal working mode. |
| 9 | RXD(PB5) | input | Serial Port | Serial port input pin |
| 10 | TXD(PB4) | Output | Serial Port | Serial port output pin |
| 11 | GND | input | Power ground | land |
| 12 | VCC | input | Power positive | power supply |
| 13 | VDDIO | - | - | Power supply selection pin (VBAT and VDDIO need to be short-circuited when powered by dry batteries) |
| 14 | LDOIN | - | - | Reserved pins (can be used as GPIO when powered by dry batteries) |
| 15 | PB7 | input | Mode | Low level: configuration mode; high level: transparent transmission mode; (valid only after the connection is established) |
| 16 | USB0DP | - | - | Program download interface |
| 17 | USB0DM | - | - | Program download interface |
| 18 | GND | - | Power ground | land |