WL-4.0T是一款高性能、低功耗、短距离的无线蓝牙模块，内部自动兼容蓝牙4.0协议，客户可以和带4.0蓝牙的手机、电脑等设备通信。不需要懂复杂的蓝牙协议，不改变用户的任何数据和协议，实现蓝牙连接和传输的功能。
二、产品特点基于蓝牙4.0协议通信技术技术。
半双工通讯，串口数据透明传输。
2.4GHz 全球免申请频段。
生产免调试，3.0-3.6V宽电压范围。
接收灵敏度高达-99dBm。
内置看门狗，保证长期可靠稳定运行。
出厂串口速率9600bps其他速率可以定制。
可提供SDK 包客户可以进行二次开发。
三、应用领域智能家居、智能穿戴、智能交通、自动化仪表仪器、遥控玩具、安全防盗。。。。。。
引脚定义
No. | Name | 功能说明 |
| No. | Name | 功能说明 |
1 | VCC | DC2.5V~3.6V |
| 21 | SWDIO RST | System reset (active low). Also HW debug and flash programming I/O |
2 | P0.30 | General purpose I/O pin | 22 | SWDCLK | HW debug and flash programming I/O |
3 | P0.00 AREF0 | General purpose I/O pin ADC Reference voltage | 23 | P0.17 | General purpose I/O pin |
4 | P0.01 AIN2 | General purpose I/O pin ADC input 2 | 24 | P0.18 | General purpose I/O pin |
5 | P0.02 AIN3 | General purpose I/O pin ADC input 3 | 25 | P0.19 | General purpose I/O pin |
6 | P0.03 AIN4 | General purpose I/O pin ADC input 4 | 26 | P0.20 | General purpose I/O pin |
7 | P0.04 AIN5 | General purpose I/O pin ADC input 5 | 27 | GND | Ground (0 V) |
8 | P0.05 AIN6 | General purpose I/O pin ADC input 6 | 28 | ANTEN (GND) | 2.4G antenna (Ground (0 V))* |
9 | P0.06 AIN7 AREF1 | General purpose I/O pin ADC input 7 ADC Reference voltage | 29 | GND | Ground (0 V) |
10 | P0.07 | General purpose I/O pin | 30 | GND | Ground (0 V) |
11 | GND | Ground (0 V) | 31 | GND | Ground (0 V) |
12 | P0.08 | General purpose I/O pin | 32 | P0.21 | General purpose I/O pin |
13 | P0.09 | General purpose I/O pin | 33 | P0.22 | General purpose I/O pin |
14 | P0.10 | General purpose I/O pin | 34 | P0.23 | General purpose I/O pin |
15 | P0.11 | General purpose I/O pin | 35 | P0.24 | General purpose I/O pin |
16 | P0.12 | General purpose I/O pin | 36 | P0.25 | General purpose I/O pin |
17 | P0.13 | General purpose I/O pin | 37 | P0.26 AIN0 XL2 | General purpose I/O pin ADC input 0 Connection for 32.768 kHz crystal |
18 | P0.14 | General purpose I/O pin | 38 | P0.27 AIN1 XL1 | General purpose I/O pin ADC input 1 Connection for 32.768 kHz crystal or external 32.768 kHz clock reference |
19 | P0.15 | General purpose I/O pin | 39 | P0.28 | General purpose I/O pin |
20 | P0.16 | General purpose I/O pin | 40 | P0.29 | General purpose I/O pin |
