Description of ESP8266 ESP-03 WiFi Module with Breakout The ESP8266 WiFi Module ESP-03 Breakout is a compact and reliable Wi-Fi Serial Transceiver designed for IoT, automation, and wireless data communication projects. It integrates a powerful microcontroller with built-in Wi-Fi capability, allowing users to connect any MCU to a wireless network through a simple UART serial interface. The breakout board provides easy access to all GPIO pins of the ESP8266 (ESP-03) module, making prototyping and integration faster and more efficient. Key Features Compact Wi-Fi Serial Transceiver module based on ESP8266 ESP-03. Supports TCP/IP protocol stack for Internet connectivity. Built-in microcontroller with integrated Wi-Fi functionality. Breakout board design for easy access to all GPIO pins. Supports UART serial communication for microcontroller interfacing. Specifications Parameter Details Model ESP8266 WiFi Module ESP-03 Operating Voltage 3.3V DC Communication Interface UART (Serial Transceiver) Wi-Fi Standard IEEE 802.11 b/g/n GPIO Pins Multiple accessible I/O pins for interfacing Antenna On-board PCB Antenna Baud Rate Default 115200 bps ESP8266 ESP-03 Pin Configuration Pin Name Alternate Functions Notes 1 GND — Pin 1 is in the corner close to the xtal and away from antenna 2 NC — — 3 UTXD SPICS1, GPIO1, CLK_RTC Typically used as serial uart0 TX 4 URXD I2SO_DATA, GPIO3, CLK_XTAL Typically used as serial uart0 RX 5 GPIO16 XPD_DCDC, RTC_GPIO0, EXT_WAKEUP, DEEPSLEEP Connected to XPD_DCDC ESP pin; can also be connected to EXT_RSTB pin to wake-up ESP from deep-sleep 6 CH_PD — Power-down: low input powers down chip, high powers up; tie high for normal operation 7 ANT — WiFi Antenna, do not connect 8 VCC — 3.3V input (pin 8 is between antenna and ESP chip) 9 GPIO14 MTMS, I2SI_WS, SP_CLK — 10 GPIO12 MTDI, I2SI_DATA, MISO — 11 GPIO13 MTCK, I2SI_BCK, MOSI — 12 GPIO15 MTDO, I2SO_BCK, SP_CS At boot: must be low to enter flash or normal boot (high enters special boot modes) 13 GPIO2 I2SO_WS, U1TXD, U0TXD At boot: must be high to enter flash or normal boot; Typically used as uart1 TX for debug 14 GPIO0 SPICS2, CLK_OUT At boot: low enters flash upload mode; high causes normal boot Applications IoT and Smart Home automation projects Wireless sensor networks Remote data monitoring and control systems Embedded Wi-Fi development and testing Packaging Details 1 × ESP8266 ESP-03 WiFi Module with Breakout ESP8266 ESP-03 WiFi Module with Breakout - Frequently Asked Questions What is the ESP8266 ESP-03 module used for? It is used to provide Wi-Fi connectivity to microcontrollers and embedded systems using UART serial communication. Does the ESP-03 module require an external microcontroller? It can operate both as a standalone microcontroller or as a serial Wi-Fi adapter for other systems. What voltage does the ESP-03 operate on? The module operates on a 3.3V DC supply. Is it compatible with Arduino boards? Yes, it can be interfaced with Arduino via the UART serial interface using level shifting. Does it support firmware updates? Yes, the module supports AT command-based firmware upgrades through serial communication. Attention Note: This item is non-returnable. If this item arrives damaged or is not functioning properly, please don't hesitate to contact us to determine if further action is required. Need Help? Our engineers are available to assist you. If you have any queries, please leave a comment below or call 09678110110 from 09:00 am to 06:00 pm (7 days a week). You can also reach us via WhatsApp or Facebook Inbox
