ESP-12F ESP8266 Serial WiFi Module

The ESP-12F ESP8266 Serial WiFi Module handles the complete 802.11 WiFi stack internally – the ESP8266 chip manages frequency selection, packet handling, WPA2 security handshake, and IP stack processing without off loading these tasks to the host microcontroller. Communication with the host goes through UART at 115200bps default using 8N1 framing, which matches the default serial settings on Arduino, STM32, and most embedded platforms. Sending AT commands over that UART connection adds WiFi to any microcontroller project without rewriting application firmware for wireless handling.

The esp 12f esp8266 module uses a castellated pad layout with the ESP-12 footprint — confirmed compatible with ESP-202 PCB designs, so existing layouts accept the esp12f module without modification. MIMO support includes both 1×1 and 2×1 configurations with STBC, which improves receive sensitivity in environments with overlapping WiFi networks on the same channel. Network modes cover Station for joining an existing router, SoftAP for creating an access point, and SoftAP+Station simultaneously — a combination that enables data forwarding and bridge builds. The esp8266 wifi module for deep-sleep sensor nodes that wake periodically to transmit data and return to sleep immediately.

A GPIO and UART pins on the esp12f esp8266 pinout run at 3.3V logic. Connecting a 5V Arduino TX pin directly to the module RX pin without a voltage divider applies 5V to a 3.3V input, degrading the pin over time. A two-resistor voltage divider on the 5V-to-3.3V signal line prevents this issue in mixed-voltage. The esp wifi module suits remote sensor nodes, MQTT clients, and HTTP data upload across for IoT projects. This esp-12f esp8266 serial wifi module building embedded WiFi sensor systems and build practical wireless communication. Available on StemVolt.

NOTE : The module is only compatible with 3.3 V Logic Level and will not work directly with 5V Logic devices.

Related Product:

• Checkout NodeMCU ESP8266 CH340 WiFi Board

Features:

• ESP-12 castellated footprint compatible with existing ESP-202 PCB designs
• Support 1×1 and 2×1 MIMO with STBC improves link reliability in dense WiFi environments
• SoftAP+Station simultaneous mode enables bridging and data-forwarding builds
• SDIO 1.1/2.0 interface available alongside SPI and UART on same module

Technical Specifications:

Specification	Details
Product Type	WiFi Module
Wireless Standard	IEEE 802.11 b/g/n
Operating Frequency	2.4 GHz – 2.5 GHZ
Network Modes	Station / SoftAP / SoftAP + Station
Wireless Security	WPA / WPA2
Communication Interface	SDIO 1.1/2.0, SPI, UART
Default UART Settings	115200bps, 8N1
Operate Voltage	3.0V – 3.5V DC
Working Current (mA)	80mA (Average)
MIMO Support	STBC, 1×1 MIMO, 2×1 MIMO

 Applications:

• ESP-12F ESP8266 Serial WiFi Module readings over WiFi to cloud dashboards
• ESP8266 12f wifi module connects Arduino serial port to home router using standard AT commands
• Module runs Soft AP configuration portal for field device wireless setup
• Serial wifi module sends periodic temperature readings from deep-sleep battery-powered sensor nodes

Package Includes:

• 1 x ESP-12F ESP8266 Serial WiFi Module