ESP8266EX 32bit TCP IP WIFI to UART Wireless Module esp8266 Low Power Networking WIFI Module ESP
[IC]：ESP8266
[Frequency]：2.4GHz
[Distance]：300m
[Interface]：UART/HSPI/I2C/I2S/IR Remote Control
[Introduction]：ESP-WROOM-02D and ESP-WROOM-02U are ESP8266EX-based modules developed by Espressif. Compared to ESP-WROOM-02, the RF performance of ESP-WROOM-02D and ESP-WROOM-02U are optimized. Besides, ESP-WROOM-02U integrates a U.FL connector. Please see Chapter 8 for details of U.FL connector.
| No. | Pin Name | Functional Description |
|---|---|---|
| 1 | 3V3 | 3.3V power supply (VDD)，It is recommended the maximum output current a power supply provides be of 500 mA or above. |
| 2 | EN | Chip enable pin. Active high. |
| 3 | IO14 | GPIO14；HSPI_CLK |
| 4 | IO12 | GPIO12；HSPI_MISO |
| 5 | IO13 | GPIO13；HSPI_MOSI；UART0_CTS |
| 6 | IO15 | GPIO15；MTDO；HSPICS；UART0_RTS Pull down. |
| 7 | IO2 | GPIO2；UART1_TXD Floating (internal pull-up) or pull up. |
| 8 | IO0 | GPIO0 UART download: pull down.Flash boot: floating or pull up. |
| 9 | GND | GND |
| 10 | IO4 | GPIO4 |
| 11 | RXD | UART0_RXD, receive end in UART download;GPIO3 |
| 12 | TXD | UART0_TXD, transmit end in UART download, floating or pull up;GPIO1 |
| 13 | GND | GND |
| 14 | IO5 | GPIO5 |
| 15 | RST | Reset |
| 16 | TOUT | It can be used to test the power-supply voltage of VDD3P3 (Pin3 and Pin4) and the input power voltage of TOUT (Pin6). These two functions cannot be used simultaneously. |
| 17 | IO16 | GPIO16; used for Deep-sleep wake-up when connected to RST pin. |
| 18 | GND | GND |