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ESP8685­WROOM­03
User Manual
www.espressif.com
Pre-release v0.1
Espressif Systems
Copyright © 2021

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Summary of Contents for Espressif ESP8685-WROOM-03

  • Page 1 ESP8685­WROOM­03 User Manual Pre-release v0.1 Espressif Systems Copyright © 2021 www.espressif.com...
  • Page 2 For revision history of this document, please refer to the last page. Documentation Change Notification Espressif provides email notifications to keep you updated on changes to technical documentation. Please sub- scribe at www.espressif.com/en/subscribe. Certification Download certificates for Espressif products from www.espressif.com/en/certificates.
  • Page 3: Table Of Contents

    Create Your First Project 2.4.1 Start a Project 2.4.2 Connect Your Device 2.4.3 Configure 2.4.4 Build the Project 2.4.5 Flash onto the Device 2.4.6 Monitor U.S. FCC Statement Learning Resources Must-Read Documents Important Resources Revision History Espressif Systems ESP8685-WROOM-03 User Manual v0.1...
  • Page 4: Overview

    1 Overview 1 Overview 1.1 Module Overview ESP8685-WROOM-03 is a general-purpose Wi-Fi and Bluetooth LE module. The rich set of peripherals and a small size make this module an ideal choice for smart homes, industrial automation, health care, consumer electronics, etc.
  • Page 5 High: on, enables the chip. Low: off, the chip powers off. Default: internally pulled-up I/O/T GPIO21, U0TXD I/O/T GPIO20, U0RXD Ground Power supply I/O/T GPIO9 P: power supply; I: input; O: output; T: high impedance. Espressif Systems ESP8685-WROOM-03 User Manual v0.1...
  • Page 6: Get Started On Esp8685­Wroom­03

    ESP-IDF Programming Guide. 2.2 Hardware Connection 1. Solder the ESP8685-WROOM-03 module to the RF testing board as shown in Figure 2. Figure 2: Hardware Connection 2. Connect the RF testing board to the USB-to-Serial board via TXD, RXD, and GND.
  • Page 7: Set Up Development Environment

    2 Get Started on ESP8685-WROOM-03 7. After download, remove the jumper on IO9 and GND. 8. Power up the RF testing board again. ESP8685-WROOM-03 will switch to working mode. The chip will read programs from flash upon initialization. Note: IO9 is internally logic high. If IO9 is set to pull-up, the Boot mode is selected. If this pin is pull-down or left floating, the Download mode is selected.
  • Page 8: Set Up Tools

    2.4.2 Connect Your Device Now connect your ESP8685-WROOM-03 module to the computer and check under what serial port the module is visible. Serial ports in Linux start with ‘/dev/tty’ in their names. Run the command below two times, first with the board unplugged, then with plugged in.
  • Page 9: Build The Project

    2 Get Started on ESP8685-WROOM-03 Setting the target with ‘idf.py set-target esp8685’ should be done once, after opening a new project. If the project contains some existing builds and configuration, they will be cleared and initialized. The target may be saved in environment variable to skip this step at all.
  • Page 10: Flash Onto The Device

    If there are no errors, the build will finish by generating the firmware binary .bin file. 2.4.5 Flash onto the Device Flash the binaries that you just built onto your ESP8685-WROOM-03 module by running: idf.py -p PORT [-b BAUD] flash Replace PORT with your module‘s serial port name from...
  • Page 11: Monitor

    Restarting in 7 seconds... To exit IDF monitor use the shortcut Ctrl+]. That’s all what you need to get started with ESP8685-WROOM-03 module! Now you are ready to try some other examples in ESP-IDF, or go right to developing your own applications.
  • Page 12: S. Fcc Statement

    As long as 3 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirement with this module installed (for example, digital device emission, PC peripheral requirements, etc.) Espressif Systems ESP8685-WROOM-03 User Manual v0.1...
  • Page 13 The end product (including the transmitter) and obtaining a separate FCC authorization. The final end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2AC7Z­ESP868503 or Contains FCC ID: 2AC7Z­ESP868503”. Espressif Systems ESP8685-WROOM-03 User Manual v0.1...
  • Page 14: Learning Resources

    4.2 Important Resources Here are the important -related resources. • ESP32 BBS Engineer-to-Engineer (E2E) Community for Espressif products where you can post questions, share knowl- edge, explore ideas, and help solve problems with fellow engineers. Espressif Systems ESP8685-WROOM-03 User Manual v0.1...
  • Page 15: Revision History

    Revision History Revision History Date Version Release notes 2021-12-27 V0.1 Preliminary release Espressif Systems ESP8685-WROOM-03 User Manual v0.1...
  • Page 16 The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a registered trademark of Bluetooth SIG. All trade names, trademarks and registered trademarks mentioned in this document are property www.espressif.com of their respective owners, and are hereby acknowledged. Copyright © 2021 Espressif Systems (Shanghai) Co., Ltd. All rights reserved.

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