ESPRESSIF ESP32-C3-MINI-1 Wi-Fi and Bluetooth LE Module User Manual

ESPRESSIF ESP32-C3-MINI-1 Wi-Fi and Bluetooth LE Module

Specifications

• Protocols: Wi-Fi and Bluetooth LE
• Frequency Range: Not specified
• Radio Module Interfaces: Integrated crystal
• Operating Voltage/Power Supply: Not specified
• Operating Current: 500 mA
• Minimum Current Delivered by Power   Supply: Not specified
• Ambient Temperature: Not specified
• Moisture Sensitivity Level (MSL): Not specified

Module Overview

The ESP32-C3-MINI-1 is a general-purpose Wi-Fi and Bluetooth LE module suitable for smart homes, industrial automation, health care, consumer electronics, etc. Its rich set of peripherals and small size make it an ideal choice for various applications.

Pin Description

• The module has 53 pins with various functions including GPIO, power supply, and control pins. Refer to the pin layout diagram for more details.

Pin Layout

• Before starting, ensure you have all the necessary hardware components and tools required for working with the ESP32-C3-MINI-1 module.

Hardware Connection

• Connect the ESP32-C3-MINI-1 module to your development setup following the pin descriptions provided in the manual.

Install Prerequisites

• Install all necessary software and tools required for ESP32-C3-MINI-1 development.

Get ESP-IDF

• Download and set up the ESP-IDF (Espressif IoT Development Framework) for programming the module.

Set up Tools

• Configure development tools such as IDEs, compilers, and debuggers for ESP32-C3-MINI-1 development.

Set up Environment Variables

• Set up environment variables to ensure proper functioning of the development environment.

FAQ

Q: Where can I find the latest version of the user manual?

A: You can always refer to the latest version at https://www.espressif.com/en/support/download/documents.

Q: How many pins does the ESP32-C3-MINI-1 module have?

A: The module has a total of 53 pins with various functions.
Refer to the pin definitions in the manual for details.

About This Document

• This user manual shows how to get started with the ESP32-C3-MINI-1 module.

Document Updates

• Please always refer to the latest version at https://www.espressif.com/en/support/download/documents.

Revision History

• For the 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 subscribe at www.espressif.com/en/subscribe.

Certification

• Download certificates for Espressif products from www.espressif.com/en/certificates.

Overview

Module Overview

ESP32-C3-MINI-1 is a general-purpose Wi-Fi and Bluetooth LE module. The rich set of peripherals and small size make this module an ideal choice for smart homes, industrial automation, health care, consumer electronics, etc.

Table 1: ESP32­C3­MINI­1 Specifications

peripheral, LED PWM controller, general DMA controller, TWAI® controller (compatible with ISO 11898-1), temperature sensor, SAR ADC
Integrated crystal| 40 MHz crystal
Operating voltage/Power supply| 3.0 V ~ 3.6 V
Operating current| Average: 80 mA
Minimum current delivered by power supply| 500 mA
Ambient temperature| –40 °C ~ +105 °C
Moisture sensitivity level (MSL)| Level 3

Pin Description

The module has 53 pins. See pin definitions in Table 2.
For peripheral pin configurations, please refer to the ESP32-C3 Family Datasheet.

Table 2: Pin Definitions

Note: Do not leave the EN pin floating.

NC| 9| —| NC
NC| 10| —| NC
Name| No.| Type| Function
---|---|---|---
IO0| 12| I/O/T| GPIO0, ADC1_CH0, XTAL_32K_P
IO1| 13| I/O/T| GPIO1, ADC1_CH1, XTAL_32K_N
NC| 15| —| NC
IO10| 16| I/O/T| GPIO10, FSPICS0
NC| 17| —| NC
IO4| 18| I/O/T| GPIO4, ADC1_CH4, FSPIHD, MTMS
IO5| 19| I/O/T| GPIO5, ADC2_CH0, FSPIWP, MTDI
IO6| 20| I/O/T| GPIO6, FSPICLK, MTCK
IO7| 21| I/O/T| GPIO7, FSPID, MTDO
IO8| 22| I/O/T| GPIO8
IO9| 23| I/O/T| GPIO9
NC| 24| —| NC
NC| 25| —| NC
IO18| 26| I/O/T| GPIO18
IO19| 27| I/O/T| GPIO19
NC| 28| —| NC
NC| 29| —| NC
RXD0| 30| I/O/T| GPIO20, U0RXD,
TXD0| 31| I/O/T| GPIO21, U0TXD
NC| 32| —| NC
NC| 33| —| NC
NC| 34| —| NC
NC| 35| —| NC

Get Started on ESP32­C3­MINI­1

What You Need

• To develop applications for the ESP32-C3-MINI-1 module you need.
• 1 x ESP32-C3-MINI-1 module
• 1 x Espressif RF testing board
• 1 x USB-to-Serial board
• 1 x Micro-USB cable
• 1 x PC running Linux
• In this user guide, we take the Linux operating system as an example. For more information about the configuration on Windows and macOS, please refer to the ESP-IDF Programming Guide.

Hardware Connection

1. Solder the ESP32-C3-MINI-1 module to the RF testing board as shown in Figure 2.
2. Connect the RF testing board to the USB-to-Serial board via TXD, RXD, and GND.
3. Connect the USB-to-Serial board to the PC.
4. Connect the RF testing board to the PC or a power adapter to enable a 5 V power supply, via the Micro-USB cable.
5. During download, connect IO0 to GND via a jumper. Then, turn ”ON” the testing board.
6. Download firmware into Flash. For details, see the sections below.
7. After downloading, remove the jumper on IO0 and GND.
8. Power up the RF testing board again. ESP32-C3-MINI-1 will switch to working mode. The chip will read programs from Flash upon initialization.

Note: IO0 is internally logic high. If IO0 is set to pull-up, the Boot mode is selected. If this pin is pull-down or left floating, the Download mode is selected. For more information on ESP32-C3-MINI-1, please refer to ESP32-C3-MINI-1 Datasheet.

• CentOS 7.
• Ubuntu and Debian (one command breaks into two lines).
• Arch.

Note:

• This guide uses the directory ~/esp on Linux as an installation folder for ESP-IDF.
• Keep in mind that ESP-IDF does not support spaces in paths.

Get ESP­IDF

• To build applications for the ESP32-C3-MINI-1 module, you need the software libraries provided by Espressif in the ESP-IDF repository.
• To get ESP-IDF, create an installation directory (~/esp) to download ESP-IDF to and clone the repository with ‘git clone’:
• ESP-IDF will be downloaded into ~/esp/esp-idf. Consult ESP-IDF Versions for information about which ESP-IDF version to use in a given situation.

Set up Tools

• Aside from the ESP-IDF, you also need to install the tools used by ESP-IDF, such as the compiler, debugger, Python packages, etc. ESP-IDF provides a script named ’install. sh,’ to help set up the tools in one go.

Set up Environment Variables

• The installed tools are not yet added to the PATH environment variable. To make the tools usable from the command line, some environment variables must be set.
• ESP-IDF provides another script ’export. sh,’ which does that. In the terminal where you are going to use ESP-IDF, run:
• Now everything is ready, you can build your first project on the ESP32-C3-MINI-1 module.

Create Your First Project Start a Project

• Now you are ready to prepare your application for the ESP32-C3-MINI-1 module. You can start with the get-started/hello_world project from the examples directory in ESP-IDF.
• Copy get-started/hello_world to ~/esp directory:
• There is a range of example projects in the examples directory in ESP-IDF. You can copy any project in the same way as presented above and run it. It is also possible to build examples in place, without copying them first.

Connect Your Device

• Now connect your ESP32-C3-MINI-1 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. The port which appears the second time is the one you need:
• Note: Keep the port name handy as you will need it in the next steps.

Configure

• Navigate to your ‘hello_world’ directory from Step 2.4.1. Start a Project, set ESP32-C3 as the target, and run the project configuration utility ‘menuconfig’.
• Setting the target with ‘idf.py set-target esp32c3’ should be done once, after opening a new project. If the project contains some existing builds and configurations, they will be cleared and initialized.
• The target may be saved in the environment variable to skip this step at all. See Selecting the Target for additional information.
• If the previous steps have been done correctly, the following menu appears:
• The colors of the menu could be different in your terminal. You can change the appearance with the option‘–style’. Please run ‘idf.py menu config –help for further information.

Build the Project

• Build the project by running
• This command will compile the application and all ESP-IDF components, and then it will generate the bootloader, partition table, and application binaries.
• If there are no errors, the build will finish by generating the firmware binary .bin file.

Flash onto the Device

• Flash the binaries that you just built onto your ESP32-C3-MINI-1 module by running.
• Replace PORT with your module‘s serial port name from Step: Connect Your Device.
• You can also change the flasher baud rate by replacing BAUD with the baud rate you need. The default baud rate is 460800.
• For more information on idf.py arguments, see idf.py.
• Note: The option ‘flash‘ automatically builds and flashes the project, so running ‘idf.py build‘ is not necessary.
• If everything goes well, the “hello_world” application starts running after you remove the jumper on IO0 and GND, and re-power up the testing board.

Monitor

• To check if “hello_world” is indeed running, type ‘idf.py -p PORT monitor‘ (Do not forget to replace PORT with your serial port name).

This command launches the IDF Monitor application:

• After startup and diagnostic logs scroll up, you should see “Hello world!” printed out by the application.
• To exit the IDF monitor use the shortcut Ctrl+].
• That’s all that you need to get started with the ESP32-C3-MINI-1 module! Now you are ready to try some other examples in ESP-IDF or go right to developing your applications.

Learning Resources

Must­Read Documents

• Please familiarize yourself with the following documents.
• ESP32-C3 Family Datasheet
  • This is an introduction to the specifications of the ESP32-C3 hardware, including overview, pin definitions, functional description, peripheral interface, electrical characteristics, etc.
• ESP-IDF Programming Guide
  • Extensive documentation for the ESP-IDF development framework, ranging from hardware guides to API references.
• ESP32-C3 Technical Reference Manual
  • Detailed information on how to use the ESP32-C3 memory and peripherals.
• Espressif Products Ordering Information

Important Resources

• Here are the important ESP32-C3-related resources.
• ESP32 BBS Engineer-to-Engineer (E2E) Community for Espressif products where you can post questions, share knowledge, explore ideas, and help solve problems with fellow engineers.

Revision History

List of Applicable FCC Rules

• FCC Part 15 Subpart C 15.247 & 15.209

Specific Operational Use Conditions

• The module has WiFi and BLE functions.

Operation Frequency:

• WiFi: 2412 ~ 2462 MHz
• Bluetooth: 2402 ~ 2480 MHz

Number of Channels:

• WiFi: 12
• Bluetooth: 40

Modulation:

• WiFi: DS; OFDM
• Bluetooth: GFSK
• Type: On-board PCB antenna
• Gain: 3.96 dBi Max

The module can be used for IoT applications with a maximum 3.96 dBi antenna. The host manufacturer installing this module into their product must ensure that the final composite product complies with the FCC requirements by a technical assessment or evaluation of the FCC rules, including the transmitter operation. The host manufacturer has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warnings as shown in this manual.

Limited Module Procedures

Not applicable. The module is a single module and complies with the requirement of FCC Part 15.212.

Trace Antenna Designs

Not applicable. The module has its antenna and does not need a host’s printed board microstrip trace antenna, etc.

RF Exposure Considerations

The module must be installed in the host equipment such that at least 20cm is maintained between the antenna and user body; and if the RF exposure statement or module layout is changed, then the host product manufacturer is required to take responsibility for the module through a change in FCC ID or new application. The FCC ID of the module cannot be used on the final product.
In these circumstances, the host manufacturer will be responsible for re- evaluating the end product (including the transmitter) and obtaining a separate FCC authorization.

Antenna specifications are as follows:

• Type: On-board PCB antenna
• Gain: 3.96 dB
• This device is intended only for host manufacturers under the following conditions:
• The transmitter module may not be co-located with any other transmitter or antenna.
• The module shall be only used with the external antenna(s) that have been originally tested and certified with this module.
• The antenna must be either permanently attached or employ a ‘unique ’ antenna coupler.
• As long as the conditions above are met, further transmitter tests will not be required. However, the host manufacturer is still responsible for testing their end product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.).

Label and Compliance Information

• Host product manufacturers need to provide a physical or e-label stating“Contains FCC ID: 2BDC6- SHELLYXMOD1H8” with their finished product.
• Information on test modes and additional testing requirements

Operation Frequency:

• WiFi: 2412 ~ 2462 MHz
• Bluetooth: 2402 ~ 2480 MHz

Number of Channels:

• WiFi: 12
• Bluetooth: 40

Modulation:

• WiFi: DS; OFDM
• Bluetooth: GFSK
• Host manufacturers must perform tests of radiated and conducted emission and spurious emission, etc., according to the actual test modes for a stand-alone modular transmitter in a host, as well as for multiple simultaneously transmitting modules or other transmitters in a host product. Only when all the test results of test modes comply with FCC requirements, then the end product be sold legally.

FCC

Additional testing, Part 15 Subpart B compliant

The modular transmitter is only FCC authorized for FCC Part 15 Subpart C 15.247 & 15.209 and the host product manufacturer is responsible for compliance with any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. If the grantee markets their product as being Part 15 Subpart stating that the hen it ost produce sun equities Part is Sudipal compliance testing ate he modular transmitter installed.
This equipment has been tested and found to comply with the limits for a Class B digital device, according to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used by the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired operation.
Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. This device and its antenna must not be co-located or operating in conjunction with any other antenna or transmitter.
The antennas used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co- located or operating in conjunction with any other antenna or transmitter.

OEM Integration Instructions

This device is intended only for OEM integrators under the following conditions:
The transmitter module may not be co-located with any other transmitter or antenna.
The module shall be only used with the external antenna(s) that have been originally tested and certified with this module.
As long as the conditions above are met, further transmitter tests will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.).

Validity of Using the Module Certification

In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization for this module in combination with the host equipment is no longer considered valid and the FCC ID of the module cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization.

End Product Labeling

The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2BDC6-SHELLYXMOD1H8”.

Disclaimer and Copyright Notice

• Information in this document, including URL references, is subject to change without notice.
• ALL THIRD-PARTY INFORMATION IN THIS DOCUMENT IS PROVIDED AS IS WITH NO WARRANTIES TO ITS AUTHENTICITY AND ACCURACY.
• NO WARRANTY IS PROVIDED TO THIS DOCUMENT FOR ITS MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE, NOR DOES ANY WARRANTY OTHERWISE ARISE OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE.
• All liability, including liability for infringement of any proprietary rights, relating to the use of information in this document is disclaimed.
• No licenses express or implied, by estoppel or otherwise, to any intellectual property rights are granted herein.
• 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 the property of their respective owners and are hereby acknowledged.
• Copyright © 2021 Espressif Systems (Shanghai) Co., Ltd. All rights reserved.
• www.espressif.com

Documents / Resources

| ESPRESSIF ESP32-C3-MINI-1 Wi-Fi and Bluetooth LE Module [pdf] User Manual
ESP32-C3-MINI-1, ESP32-C3-MINI-1 Wi-Fi and Bluetooth LE Module, Wi-Fi and Bluetooth LE Module, Bluetooth LE Module, LE Module, Module
---|---

References

• GitHub - espressif/esp-idf: Espressif IoT Development Framework. Official development framework for Espressif SoCs.
• esp-idf/examples/get-started/hello_world at c77c4ccf6c43ab09fd89e7c907bf5cf2a3499e3b · espressif/esp-idf · GitHub
• esp-idf/examples at master · espressif/esp-idf · GitHub
• ESP32 Forum - Index page

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