What it is
The ShillehTek ESP8266 ESP-01 Serial WiFi Module 1MB Wireless Transceiver IoT is a compact Wi‑Fi transceiver module with an onboard 32‑bit processor and integrated TCP/IP stack, designed to add wireless networking to Arduino, Raspberry Pi, and sensor projects or run lightweight standalone IoT tasks (MQTT, GET/POST requests, simple web servers).
Pins
This module is controlled and flashed over a standard Serial UART interface (RX/TX). For the exact pin names and pinout (including any power, enable, or boot-related pins), refer to the silkscreen labels on the module and the listing photos for your specific revision.
Technical Specifications
| Item | Details |
|---|---|
| Module | ESP8266 ESP-01 Wi‑Fi transceiver module |
| Processor | 32‑bit Tensilica L106 |
| Flash storage | 1MB |
| Control / programming interface | Serial UART (RX/TX) via AT commands or USB‑TTL adapter |
| Networking | Integrated TCP/IP stack; supports GET/POST requests and MQTT workflows (via firmware/software) |
| OTA updates | Supported (firmware dependent) |
| Power-saving | Deep sleep modes with micro‑amp level consumption (usage dependent) |
Frequently Asked Questions
How do I connect the ESP8266 ESP-01 to Arduino or a USB-TTL adapter?
Use the module’s UART (RX/TX) for control and flashing. Match RX to TX and TX to RX on your Arduino/USB-TTL adapter, and confirm the correct pin labels on the module silkscreen and listing photos before wiring.
Can the ESP-01 run by itself or does it need a microcontroller?
It can be used as a WiFi add-on for another microcontroller over UART, or it can run simple standalone tasks because it includes its own 32-bit processor and networking stack.
Does this 1MB ESP-01 support OTA (over-the-air) firmware updates?
Yes—OTA updates are supported on this 1MB model when using compatible firmware and an OTA-enabled workflow.
Can I use AT commands to send HTTP GET/POST or connect to MQTT?
The module is designed to be controlled over UART using AT commands (with suitable firmware), and it’s commonly used to send GET/POST requests or connect to MQTT brokers for IoT data logging.