Espressif Systems ESP32-C3-MINI-1U Manuale utente

ESP32C3MINI1U

User Manual

Pre-release v0.1

Espressif Systems

www.espressif.com

About This Document

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

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.

Contents

1 Overview 4

1.1 Module Overview 4

1.2 Pin Description 5

2 Get Started on ESP32C3MINI1U 7

2.1 What You Need 7

2.2 Hardware Connection 7

2.3 Set up Development Environment 8

2.3.1 Install Prerequisites 8

2.3.2 Get ESP-IDF 8

2.3.3 Set up Tools 9

2.3.4 Set up Environment Variables 9

2.4 Create Your First Project 9

2.4.1 Start a Project 9

2.4.2 Connect Your Device 9

2.4.3 Configure 9

2.4.4 Build the Project 10

2.4.5 Flash onto the Device 11

2.4.6 Monitor 12

3 U.S. FCC Statement 14

4 IC Statement 18

5 Learning Resources 21

5.1 Must-Read Documents 21

5.2 Important Resources 21

Revision History 22

Espressif Systems 3 ESP32-C3-MINI-1U User Manual v0.1

1 Overview

1.1 Module Overview

ESP32-C3-MINI-1U 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: ESP32C3MINI1U 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

Espressif Systems 4 ESP32-C3-MINI-1U User Manual v0.1

1 Overview

1.2 Pin Description

Pin 49

GND

GND GND GND

GNDGND

GND GND GND

Pin 1

Pin 2

Pin 3

Pin 4

Pin 6

Pin 5

Pin 7

Pin 8

Pin 9

Pin 10

Pin 11

Pin 53

GND

Pin 52

GND

Pin 12

Pin 13

Pin 14

Pin 15

Pin 16

Pin 17

Pin 18

Pin 19

Pin 20

Pin 21

Pin 22

Pin 23

Pin 24

Pin 25

Pin 51

GND

Pin 26

Pin 27

Pin 28

Pin 29

Pin 30

Pin 31

Pin 32

Pin 33

Pin 34

Pin 35

Pin 50

GND

Pin 36

Pin 37

Pin 38

Pin 39

Pin 40

Pin 41

Pin 42

Pin 43

Pin 44

Pin 45

Pin 46

Pin 47

Pin 48

GND

3V3

IO2

IO3

GND

IO0

IO1

GND

IO10

IO4

IO5

IO6

IO7

IO8

IO9

IO18

IO19

RXD0

TXD0

GND

Keepout Zone

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 Series 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

Cont’d on next page

Espressif Systems 5 ESP32-C3-MINI-1U User Manual v0.1

1 Overview

Table 2 – cont’d from previous page

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

Espressif Systems 6 ESP32-C3-MINI-1U User Manual v0.1

2 Get Started on ESP32-C3-MINI-1U

2 Get Started on ESP32C3MINI1U

2.1 What You Need

To develop applications for ESP32-C3-MINI-1U module you need:

• 1 x ESP32-C3-MINI-1U 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.

2.2 Hardware Connection

1. Solder the ESP32-C3-MINI-1U 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.

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.

Espressif Systems 7 ESP32-C3-MINI-1U User Manual v0.1

2 Get Started on ESP32-C3-MINI-1U

7. After download, remove the jumper on IO0 and GND.

8. Power up the RF testing board again. ESP32-C3-MINI-1U 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-1U, please refer to

ESP32-C3-MINI-1 & ESP32-C3-MINI-1U Datasheet .

2.3 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.

2.3.1 Install Prerequisites

To compile with ESP-IDF you need to get the following packages:

• CentOS 7:

1sudo yum install git wget flex bison gperf python cmake ninja-build ccache dfu-

util

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

1sudo apt-get install git wget flex bison gperf python python-pip python-

setuptools cmake

2ninja-build ccache libffi-dev libssl-dev dfu-util

• Arch:

1sudo 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.

2.3.2 Get ESPIDF

To build applications for ESP32-C3-MINI-1U 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’:

1mkdir -p ~/esp

2cd ~/esp

3git clone --recursive https://github.com/espressif/esp-idf.git

Espressif Systems 8 ESP32-C3-MINI-1U User Manual v0.1

2 Get Started on ESP32-C3-MINI-1U

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.

2.3.3 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.

1cd ~/esp/esp-idf

2./install.sh

2.3.4 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:

1. $HOME/esp/esp-idf/export.sh

Now everything is ready, you can build your first project on ESP32-C3-MINI-1U module.

2.4 Create Your First Project

2.4.1 Start a Project

Now you are ready to prepare your application for ESP32-C3-MINI-1U module. You can start with get-started/hello_world

project from examples directory in ESP-IDF.

Copy get-started/hello_world to ~/esp directory:

1cd ~/esp

2cp -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.

2.4.2 Connect Your Device

Now connect your ESP32-C3-MINI-1U 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:

1ls /dev/tty*

Note:

Keep the port name handy as you will need it in the next steps.

2.4.3 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’.

Espressif Systems 9 ESP32-C3-MINI-1U User Manual v0.1

2 Get Started on ESP32-C3-MINI-1U

1cd ~/esp/hello_world

2idf.py set-target esp32c3

3idf.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 information.

2.4.4 Build the Project

Build the project by running:

1idf.py build

This command will compile the application and all ESP-IDF components, then it will generate the bootloader,

partition table, and application binaries.

1$ idf.py build

2Running cmake in directory /path/to/hello_world/build

3Executing ”cmake -G Ninja --warn-uninitialized /path/to/hello_world”...

4Warn about uninitialized values.

5-- Found Git: /usr/bin/git (found version ”2.17.0”)

6-- Building empty aws_iot component due to configuration

7-- Component names: ...

8-- Component paths: ...

10 ... (more lines of build system output)

Espressif Systems 10 ESP32-C3-MINI-1U User Manual v0.1

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