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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
<br />
== Summary ==<br />
The Waveshare Pico-ESP8266 is a WiFi expansion module for the Raspberry Pi Pico family. It is controlled over UART using AT commands and supports TCP/UDP communication through an embedded LWIP protocol stack. The module provides three WiFi operating modes (STA, AP, STA+AP), a PCB antenna in the 2.4 GHz band, and two function buttons for updating the AT firmware.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL20182 WSAL20182 – ESP8266 WiFi Module for Raspberry Pi Pico, Supports TCP/UDP Protocol]<br />
<br />
== Technical overview ==<br />
* Interface: UART at 115200 bps baud rate<br />
* WiFi standard: IEEE 802.11b/g/n in the 2400–2483.5 MHz frequency range<br />
* Three WiFi operating modes: station (STA), access point (AP), and combined (STA+AP)<br />
* Operating voltage: 3.3 V; operating temperature: -40 °C to 85 °C<br />
* Module dimensions: 58 × 25 mm<br />
* Two function buttons allow flashing new AT firmware via the Pico<br />
* Suitable for IoT projects where the Pico needs a WiFi connection<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
AT<br />
AT+RST<br />
AT+GMR<br />
AT+CWMODE=3<br />
AT+CWJAP="SSID","password"<br />
AT+CIFSR<br />
AT+CIPSTART="TCP","192.168.3.116",8080<br />
AT+CIPSEND=4<br />
AT+CIPMODE=1<br />
AT+CIPMUX=1<br />
AT+CIPSERVER=1<br />
AT+CIPCLOSE<br />
AT+CIPSTART=4,"UDP","192.168.101.110",8080,1112,0<br />
AT+CIPSEND=4,7<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* The IP addresses shown (e.g., 192.168.3.116, 192.168.3.133, 192.168.4.1) are example values from the source document and must be replaced with your own network values.<br />
* Exiting transparent mode by sending “+++” requires the three characters to be sent consecutively without spaces or line breaks; manual typing may be too slow, so use a serial port tool instead.<br />
* When enabling multiple connections (AT+CIPMUX=1), the message “IPMODE must be 0” can appear; the ESP8266 must then be disconnected/restarted and the command re-entered.<br />
* The firmware version shown (AT version 1.2.0.0 / SDK 1.5.4.1) reflects an older snapshot; current versions may differ.<br />
* Flashing steps via the Pico assume the dev_cdc_ports.uf2 file is available; the exact file and path depend on the development environment used.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Pico-ESP8266 Pico ESP8266 - Waveshare Wiki]<br />
* Source revision: 68915<br />
* Captured: 2026-09-02T03:30:41+00:00<br />
* SHA-256: <code>933882a226b675688d114e3d89365d1efebe847cc2d21c03eec91e9f85df4a5a</code></div>JWTechPublisher