ESP-01 ESP8266 is a low cost Wi-Fi module available for use in low cost wireless applications. The module has 8-pin connector on the board with 2x4 configuration. The module has the below pin out.
The pin description is as below:
| Pin Name | Function | Notes |
|---|---|---|
| VCC | Power Supply | Connect to 3.3 V only (not 5 V). |
| GND | Ground | Common ground with other devices. |
| TX (GPIO1) | UART Transmit | Connect to RX of USB–Serial adapter or MCU. |
| RX (GPIO3) | UART Receive | Connect to TX of USB–Serial adapter or MCU. |
| CH_PD (EN) | Chip Enable | Must be tied HIGH (3.3 V) to enable the chip. |
| RST | Reset | Active LOW; pulling low resets the module. |
| GPIO0 | General Purpose I/O | Used for boot mode selection: • HIGH → Normal boot • LOW → Flashing mode |
| GPIO2 | General Purpose I/O | Typically HIGH on boot; can be used as digital I |
Connector used in 2.54mm pitch berg stick through hole male type. The part number of the connector used for mating of this board is M20-7830446. The MPN of the connector present on this board is M20-9980446.
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