E104-BT40X Dual-mode Bluetooth module Supports BLE 4.2 and SPP dual modes Easy to develop
[Chip Solution]：-
[Communication Interface]：UART
[Operating Frequency]：2.400-2.480 GHz
[Bluetooth Protocol]：V4.2 + V3.0 SPP
[Communication diatance]：40m
[Size]：16*13mm
[Introduction]：The E104-BT40 Bluetooth module is a serial-to-dual-mode Bluetooth slave module based on Bluetooth 4.2+3.0, supporting Bluetooth Low Energy (BLE) and Classic Bluetooth SPP Profile. It can freely switch between BLE and Classic Bluetooth, operating in the 2.4GHz frequency band. Parameters are set using common AT commands, making operation simple and fast.
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| Pin number | Pin Definition | Pin direction | Pin Function | illustrate |
| 1 | GND | - | Power ground | Power reference ground |
| 2 | TXD | Output | Serial port data sending | The module outputs serial port data |
| 3 | RXD | input | Serial port data reception | The module receives external serial port data |
| 4 | P02 | Output | General purpose output IO | User-settable output levels |
| 5 | P03 | Output | General purpose output IO | User can set the output level① |
| 6 | P04 | - | - | NC |
| 7 | P05 | - | - | NC |
| 8 | P06 | - | - | NC |
| 9 | P07 | - | - | NC |
| 10 | GND | - | Power ground | Power reference ground |
| 11 | P10 | input | General purpose input IO | User can read IO level, internal pull-up |
| 12 | P11 | input | General purpose input IO | User can read IO level, internal pull-up |
| 13 | PWM2 | Output | Output PWM | User-configured PWM output wave |
| 14 | PWM3 | Output | Output PWM | User configured output PWM wave② |
| 15 | P33 | - | CTS | |
| 16 | P34 | - | RTS | |
| 17 | VCC | - | 3.3V | Power input |
| 18 | GND | - | Power ground | Power reference ground |
| 19 | GND | - | Power ground | Power reference ground |
| 20 | NC | - | - | |
| 21 | NC | - | - | |
| 22 | NC | - | - | |
| 23 | RST | - | Reset pin | Active low |
| 24 | STATUS | Output | Status indicator LED | Bluetooth not connected: output frequency is 1Hz square wave; Bluetooth connected: low level |
| 25 | MODE | input | Mode Selection | Low level: configuration mode ③; High level: transparent transmission mode |
| 26 | DISC | input | Disconnect | Internal pull-up, falling edge valid |
| 27 | LINK | Output | Connection Status | Bluetooth not connected: high level; Bluetooth connected: low level |
| 28 | GND | - | Power ground | Power reference ground |