E103-W04 Serial port to wireless WiFi module
[Transmission power]：20dBm
[Communication distance]：70m
[Product weight]：0.8g±0.1g
[Product size]：19x13x2.5mm
[Introduction]：E103-W04 is a high-performance and highly reliable wireless WiFi data transmission module developed by Chengdu Ebyte Electronic Technology Co., Ltd. The module integrates the transparent transmission function, which can be used immediately, and can realize serial port (TTL) data through WiFi. Device networking data interaction. Support IEEE802.11 b/g/n standard, support 4-way Socket connection; support Alibaba Cloud, Baidu Cloud, OneNet, standard MQTT protocol; support TCP/UDP/HTTP/MQTT multiple network communication protocols. The module is small in size, comes with PCB onboard antenna, works in the 2.4GHz frequency band, has low power consumption and fast data transmission. It is widely used in Internet of Things applications such as smart home appliances, smart homes, wireless audio and video, smart toys, medical monitoring, and industrial control.
| Pin number | Pin definition | Function and usage instructions |
| 1 | NC | hanging in the air |
| 2 | LED-LINKA | High: WIFI connection successful Low: WIFI not connected |
| 3 | LED-LINKB | High: The device is successfully connected to the data processing server. Low: The device is not successfully connected to the data processing server. |
| 4 | 485_EN | External 485 chip enable pin, set high when the serial port sends data, and normally low; |
| 5 | NC | hanging in the air |
| 6 | NC | hanging in the air |
| 7 | EN | Wake-up pin, high level wakes up the chip, built-in pull-up |
| 8 | RELOAD | Pull low to restart, pull low 5S device to restore factory settings |
| 9 | GND | GND pin |
| 10 | GND | GND pin |
| 11 | VDD | Equipment power supply DC 3.0V～3.6V (above 350mA) |
| 12 | NC | hanging in the air |
| 13 | NC | hanging in the air |
| 14 | TX | TXD pin, used as UART serial port output pin |
| 15 | RX | RXD pin, used as UART serial port input pin |
| 16 | NC | hanging in the air |
| 17 | NC | hanging in the air |
| 18 | NC | hanging in the air |
| 19 | NC | hanging in the air |
| 20 | NC | hanging in the air |
| 21 | LED-STATE | High: The device is faulty and needs to be restarted. Low: The device is normal. |
| 22 | LED-DATA | Square wave: data sending and receiving |