User's Manual

3. Hardware Preparation for Compiling ESP-WROOM-02D

Figure 2-1. ESP-WROOM-02D Download Mode

3. Connect the USB-to-TTL converter to the PC.

4. Download ﬁrmware to ﬂash with the ESP8266 DOWNLOAD TOOL.

5. After downloading, switch ESP-WROOM-02U to working mode."

Set IO0 as ﬂoating or pull-up.

6. Power on ESP-LAUNCHER again and the chip will read and run programs from the

ﬂash.

——🔚

📖 Note:

On how to download ﬁrmware, please refer to Chapter 4, "Flash Maps" and Chapter 6, "Downloading the

Firmware".

📖 Notes:

• IO0 is an internal pull-up pin.

•

For more information on ESP-WROOM-02U hardware, please refer to ESP8266 System

Description and ESP-WROOM-02 Datasheet.

Espressif

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