ESP-01 ESP8266 Serial Wi-Fi Transceiver Module

The ESP-01 module requires a stable 3.3V DC power supply. It is not 5V tolerant on its GPIO or serial pins, so you must use an external logic-level converter if interfacing with a 5V microcontroller like an Arduino Uno to prevent damage to the module.

To program the ESP-01, you need a USB-to-Serial adapter (like FTDI) set to 3.3V logic. Connect the adapter's TX to ESP-01 RX, RX to TX, VCC to 3.3V, and GND to GND. Hold GPIO0 low during reset to enter flash mode. In the Arduino IDE, install the ESP8266 board package via Boards Manager, select 'Generic ESP8266 Module' as the board, and choose the correct COM port.

Yes, the ESP8266's integrated 32-bit CPU and 1MB flash allow it to run custom firmware as a standalone application processor. You can develop code using the Arduino core for ESP8266, ESP-IDF, or MicroPython, enabling the module to control sensors, read GPIOs, and manage Wi-Fi connectivity independently.

With its onboard PCB antenna and 19.5 dBm output power, the ESP-01 typically achieves a range of up to 100 meters in open space. Actual throughput depends on environment and Wi-Fi mode but supports 802.11n with data rates up to 72.2 Mbps, utilizing features like A-MPDU aggregation for efficient data transfer.