Elecrow Crowtail Serial WiFi Module w/ UART Interface

Connect the module's 4-pin Crowtail cable to a compatible base shield (VCC, GND, TX, RX). Power it with 5V. Use a USB-to-serial adapter to communicate with the module's UART pins. Send AT commands (e.g., AT+CWMODE, AT+CWJAP) via a serial terminal at the default baud rate (typically 115200) to configure Wi-Fi SSID, password, and operation mode. Refer to ESP8266 AT command documentation for the full command set and syntax for network connections and data transmission.

The module typically operates at a default baud rate of 115200 bps for AT command communication. You can verify this by sending 'AT' (without quotes) via a serial terminal; a response of 'OK' confirms communication. The baud rate can often be changed using the AT+UART command if required by your host microcontroller, but ensure both devices are synchronized on the same speed to prevent data corruption or unresponsive behavior during serial data framing.

Yes, the ESP-12 chip is programmable using the Arduino IDE with the ESP8266 board package. You will need to access the module's GPIO0 and RST pins for flashing mode, which may require soldering headers or wires. Connect GPIO0 to GND, reset the board, and then upload your sketch via a USB-to-serial programmer (e.g., FTDI). After flashing, disconnect GPIO0 from GND and reset to run your custom application, bypassing the default AT command firmware for direct Wi-Fi control.

The module utilizes the ESP8266's power management features. In active Wi-Fi transmission mode, current draw can reach ~170mA from the 5V supply. With Wi-Fi connected but idle, it drops significantly. Using deep sleep mode via the ESP's RTC, consumption can be reduced to microamps (uA), making it suitable for battery-powered sensor nodes that wake periodically to transmit data. Implement sleep commands in your firmware to maximize battery life for long-term deployments.