WSAL20182 – Pico-ESP8266/en

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.

Summary

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.

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WSAL20182 – ESP8266 WiFi Module for Raspberry Pi Pico, Supports TCP/UDP Protocol

Technical overview

Interface: UART at 115200 bps baud rate
WiFi standard: IEEE 802.11b/g/n in the 2400–2483.5 MHz frequency range
Three WiFi operating modes: station (STA), access point (AP), and combined (STA+AP)
Operating voltage: 3.3 V; operating temperature: -40 °C to 85 °C
Module dimensions: 58 × 25 mm
Two function buttons allow flashing new AT firmware via the Pico
Suitable for IoT projects where the Pico needs a WiFi connection

Commands and examples – verify before use:

AT
AT+RST
AT+GMR
AT+CWMODE=3
AT+CWJAP="SSID","password"
AT+CIFSR
AT+CIPSTART="TCP","192.168.3.116",8080
AT+CIPSEND=4
AT+CIPMODE=1
AT+CIPMUX=1
AT+CIPSERVER=1
AT+CIPCLOSE
AT+CIPSTART=4,"UDP","192.168.101.110",8080,1112,0
AT+CIPSEND=4,7

Notes and version constraints

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.
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.
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.
The firmware version shown (AT version 1.2.0.0 / SDK 1.5.4.1) reflects an older snapshot; current versions may differ.
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.

Source and revision record

Pico ESP8266 - Waveshare Wiki
Source revision: 68915
Captured: 2026-09-02T03:30:41+00:00
SHA-256: 933882a226b675688d114e3d89365d1efebe847cc2d21c03eec91e9f85df4a5a