- ESP8266 with 4MB flash memory, ceramic antenna

Pinout
Section titled “Pinout”| 1 | 2 |
|---|---|
| ADC | IO16 |
| RSV | IO5 |
| RSV | IO4 |
| IO10 | IO0 |
| IO9 | IO2 |
| MOSI | 3.3V |
| CS | GND |
| MISO | IO14 |
| CLK | IO12 |
| GND | IO13 |
| 3.3V | IO15 |
| EN | RX |
| RST | TX |
| GND | GND |
| 5V | 3.3V |

| 1 | 2 |
|---|---|
| ADC | IO16 |
| RSV | IO5 |
| RSV | IO4 |
| IO10 | IO0 |
| IO9 | IO2 |
| MOSI | 3.3V |
| CS | GND |
| MISO | IO14 |
| CLK | IO12 |
| GND | IO13 |
| 3.3V | IO15 |
| EN | RX |
| RST | TX |
| GND | GND |
| 5V | 3.3V |