ESPRESSIF ESP32­-C3­-MINI-­1 Wi-Fi and Bluetooth Internet of Things Module User Manual

**ESPRESSIF ESP32­-C3­-MINI-­1 Wi-Fi and Bluetooth Internet of Things Module User Manual

**

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 on https://www.espressif.com/en/support/download/documents.

Revision History
For revision history of this document, please refer to the last page.

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Certification
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Overview

1. Module Overview
   ESP32-C3-MINI-1 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.
   Table 1: ESP32­C3­MINI­1 Specifications
   **** Categories| Parameters| Specifications
   ---|---|---
   Wi-Fi| Protocols| 802.11 b/g/n (up to 150 Mbps)
   Frequency range| 2412 ~ 2462 MHz
   Bluetooth®| Protocols| Bluetooth® LE: Bluetooth 5 and Bluetooth mesh
   Radio| Class-1, class-2 and class-3 transmitter

Hardware

| Module interfaces| GPIO, SPI, UART, I2C, I2S, remote control 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
2. 3. Pin Description
Figure 1: Pin Layout (Top View)

The module has 53 pins. See pin definitions in Table 2.
For peripheral pin configurations, please refer to ESP32-C3 Family Datasheet .
Table 2: Pin Definitions
**** Name| No.| Type| Function
---|---|---|---
GND| 1, 2, 11, 14, 36-53| P| Ground
3V3| 3| P| Power supply
NC| 4| —| NC
IO2| 5| I/O/T| GPIO2, ADC1_CH2, FSPIQ
IO3| 6| I/O/T| GPIO3, ADC1_CH3
NC| 7| —| NC

EN

|

8

|

I

| High: on, enables the chip. Low: off, the chip powers off.

Note: Do not leave the EN pin floating.

NC| 9| —| NC
NC| 10| —| NC
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 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 Linux operating system as an example. For more information about the configuration on Windows and macOS, please refer to 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 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 download, 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.

Set up Development Environment

The Espressif IoT Development Framework (ESP-IDF for short) is a framework for developing applications based on the Espressif chips. Users can develop applications with ESP chips in Windows/Linux/macOS based on ESP-IDF. Here we take Linux operating system as an example.

1. Install Prerequisites
   To compile with ESP-IDF you need to get the following packages:

   • CentOS 7:
     1 sudo yum install git wget flex bison gperf python cmake ninja-build ccache dfuutil

   • Ubuntu and Debian (one command breaks into two lines):

   1. sudo apt-get install git wget flex bison gperf python python-pip pythonsetuptools cmake
   2. ninja-build ccache libffi-dev libssl-dev dfu-util

   • Arch:

   • 1 sudo pacman -S –needed gcc git make flex bison gperf python-pip cmake ninja ccache dfu-util
     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.

2. Get ESP­IDF
   To build applications for ESP32-C3-MINI-1 module, you need the software libraries provided by Espressif in ESP-IDF repository.
   To get ESP-IDF, create an installation directory (~/esp) to download ESP-IDF to and clone the repository with ‘git clone’:

3. mkdir -p ~/esp

4. cd ~/esp

5. git clone –recursive https://github.com/espressif/esp-idf.git
   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.

6. 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.

7. cd ~/esp/esp-idf

8. /install.sh

9. 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:

   • $HOME/esp/esp-idf/export.sh
     Now everything is ready, you can build your first project on ESP32-C3 MINI-1 module.

Create Your First Project

1. Start a Project
   Now you are ready to prepare your application for ESP32-C3-MINI-1 module. You can start with get-started/hello_world project from examples directory in ESP- IDF.
   Copy get-started/hello_world to ~/esp directory:

2. cd ~/esp

3. cp -r $IDF_PATH/examples/get-started/hello_world .
   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.
   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.

4. 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:

   • ls /dev/tty*
     Note
     Keep the port name handy as you will need it in the next steps.

5. 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’.

6. cd ~/esp/hello_world

7. idf.py set-target esp32c3

8. idf.py 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 configuration, they will be cleared and initialized. The target may be saved in 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:
   Figure 3: Project Configuration ­ Home Window
   
   The colors of the menu could be different in your terminal. You can change the appearance with the option ‘–style’. Please run ‘idf.py menuconfig –help’for further informat

9. Build the Project
   Build the project by running:

10. idf.py b
    This command will compile the application and all ESP-IDF components, then it will generate the bootloader, partition table, and application binarries.

11. $ idf.py build

12. Running cmake in directory /path/to/hello_world/build

13. Executing ”cmake -G Ninja –warn-uninitialized /path/to/hello_world”…

14. Warn about uninitialized values.

15. — Found Git: /usr/bin/git (found version ”2.17.0”)

16.  — Building empty aws_iot component due to configuration

17. — Component names: …

18. — Component paths: …

19. 10. … (more lines of build system out
20. 12. [527/527] Generating hello-world.bin

21. esptool.py v2.3.1

22. 15. Project build complete. To flash, run this command:

23. ../../../components/esptool_py/esptool/esptool.py -p (PORT) -b 921600 writeflash –flash mode dio

24. –flash_size detect –flash_freq 40m 0x10000 build/hello world.bin build 0x1000

25. build/bootloader/bootloader.bin 0x8000 build/partition_table/partition-table.bin

26. or run ’idf.py -p PORT flash’
    If there are no errors, the build will finish by generating the firmware binary .bin file.

27. Flash onto the Device
    Flash the binaries that you just built onto your ESP32-C3-MINI-1 module by running:

28. idf.py -p PORT [-b BAUD] flash
    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.

1. …
2. esptool.py –chip esp32c3 -p /dev/ttyUSB0 -b 460800 –before=default_reset –after =hard_reset write_flash –flash_mode dio –flash_freq 80m –flash_size 2MB 0x 8000 partition_table/partition-table.bin 0x0 bootloader/bootloader.bin 0x10000 hello-world.bin
3. esptool.py v3.0
4. Serial port /dev/ttyUSB0
5. Connecting….
6. Chip is ESP32-C3
7. Features: Wi-Fi
8. Crystal is 40MHz
9. MAC: 7c:df:a1:40:02:a4
10. Uploading stub…
11. Running stub…
12. Stub running…
13. Changing baud rate to 460800
14. Changed.
15. Configuring flash size…
16. Compressed 3072 bytes to 103…
17. Writing at 0x00008000… (100 %)
18. Wrote 3072 bytes (103 compressed) at 0x00008000 in 0.0 seconds (effective  4238.1 kbit/s)…
19. Hash of data verified.
20. Compressed 18960 bytes to 11311…
21. Writing at 0x00000000… (100 %)
22. Wrote 18960 bytes (11311 compressed) at 0x00000000 in 0.3 seconds  (effective 584.9 kbit/s)…
23. Hash of data verified.
24. Compressed 145520 bytes to 71984…
25. Writing at 0x00010000… (20 %)
26. Writing at 0x00014000… (40 %)
27. Writing at 0x00018000… (60 %)
28. Writing at 0x0001c000… (80 %)
29. Writing at 0x00020000… (100 %)
30. Wrote 145520 bytes (71984 compressed) at 0x00010000 in 2.3 seconds (effective 504.4 kbit/s)…
31. Hash of data verified.
32. 33. Leaving…
33. Hard resetting via RTS pin…
34. Done

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:

1. $ idf.py -p /dev/ttyUSB0 monitor
2. Running idf_monitor in directory […]/esp/hello_world/build
3. Executing ”python […]/esp-idf/tools/idf_monitor.py -b 115200 […]/esp/hello_world/build /hello-world.elf”…
4. — idf_monitor on /dev/ttyUSB0 115200 —
5. — Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H —
6. ets Jun 8 2016 00:22:57
7. 8. rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
8. ets Jun 8 2016 00:22:57
9. …

After startup and diagnostic logs scroll up, you should see “Hello world!” printed out by the application.

1. …
2. Hello world!
3. Restarting in 10 seconds…
4. This is esp32c3 chip with 1 CPU core, WiFi/BLE, 4MB external flash
5. Restarting in 9 seconds…
6. Restarting in 8 seconds…
7. Restarting in 7 seconds…

To exit IDF monitor use the shortcut Ctrl+].

That’s all what you need to get started with ESP32-C3-MINI-1 module! Now you are ready to try some other examples in ESP-IDF, or go right to developing your own applications.

Learning Resources

1. Must­Read Documents
   Please familiarize yourself with the following documents:

2. 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.

3. ESP-IDF Programming Guide
   Extensive documentation for the ESP-IDF development framework, ranging from hardware guides to API
   reference.

4. ESP32-C3 Technical Reference Manual
   Detailed information on how to use the ESP32-C3 memory and peripherals.

5. 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

Date

| Version| Release notes
---|---|---
2021-02-01| V0.1|

Preliminary release

Disclaimer and Copyright Notice
Information in this document, including URL references, is subject to change without notice.
ALL THIRD PARTY’S 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, NONINFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, NOR DOES ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE.
All liability, including liability for infringement of any proprietary rights, relating to 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 property of their respective owners, and are hereby acknowledged.
Copyright © 2021 Espressif Systems (Shanghai) Co., Ltd. All rights reserved.

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