Espressif ESP32-DevKitM-1 User manual

ESP32-DevKitM-1
This user guide will help you get started with ESP32-DevKitM-1 and will also provide
more in-depth information.
ESP32-DevKitM-1 is an ESP32-MINI-1(1U)-based development board produced by
Espressif. Most of the I/O pins are broken out to the pin headers on both sides for easy
interfacing. Users can either connect peripherals with jumper wires or mount ESP32-
DevKitM-1 on a breadboard.
ESP32-DevKitM-1 - front
ESP32-DevKitM-1 - isometric
The document consists of the following major sections:
•Getting started: Provides an overview of the ESP32-DevKitM-1 and
hardware/software setup instructions to get started.
•Hardware reference: Provides more detailed information about the ESP32-
DevKitM-1’s hardware.
•Related Documents: Gives links to related documentaiton.
Getting Started
This section describes how to get started with ESP32-DevKitM-1. It begins with a few
introductory sections about the ESP32-DevKitM-1, then Section Start Application
Development provides instructions on how to do the initial hardware setup and then
how to flash firmware onto the ESP32-DevKitM-1.

Overview
This is a small and convenient development board that features:
•ESP32-MINI-1, or ESP32-MINI-1U module
•USB-to-serial programming interface that also provides power supply for the
board
•pin headers
•pushbuttons for reset and activation of Firmware Download mode
•a few other components
Contents and Packaging
Retail orders
If you order a few samples, each ESP32-DevKitM-1 comes in an individual package in
either antistatic bag or any packaging depending on your retailer.
For retail orders, please go to https://www.espressif.com/en/company/contact/buy-a-
sample.
Wholesale Orders
If you order in bulk, the boards come in large cardboard boxes.
For wholesale orders, please go to https://www.espressif.com/en/contact-us/sales-
questions.
Description of Components
The following figure and the table below describe the key components, interfaces and
controls of the ESP32-DevKitM-1 board. We take the board with a ESP32-MINI-1
module as an example in the following sections.

ESP32-DevKitM-1 - front
Key Component
Description
On-board module
ESP32-MINI-1 module or ESP32-MINI-1U module. ESP32-MINI-1
comes with an on-board PCB antenna. ESP32-MINI-1U comes with
an external antenna connector. The two modules both have a 4 MB
flash in chip package. For details, please see ESP32-MINI-1 &
ESP32-MINI-1U Datasheet.
5 V to 3.3 V LDO
Power regulator converts 5 V to 3.3 V.
Boot Button
Download button. Holding down Boot and then
pressing Reset initiates Firmware Download mode for downloading
firmware through the serial port.
Reset Button
Reset Button
Micro-USB Port
USB interface. Power supply for the board as well as the
communication interface between a computer and the ESP32 chip.
USB-to-UART
Bridge
Single USB-UART bridge chip provides transfer rates up to 3 Mbps.

Key Component
Description
3.3 V Power On
LED
Turns on when the USB is connected to the board. For details, please
see the schematics in Related Documents.
I/O Connector
All available GPIO pins (except for the SPI bus for flash) are broken
out to the pin headers on the board. Users can program ESP32 chip
to enable multiple functions.
Start Application Development
Before powering up your ESP32-DevKitM-1, please make sure that it is in good
condition with no obvious signs of damage.
Required Hardware
•ESP32-DevKitM-1
•USB 2.0 cable (Standard-A to Micro-B)
•Computer running Windows, Linux, or macOS
Software Setup
Please proceed to Get Started, where Section Installation Step by Step will quickly help
you set up the development environment and then flash an application example onto
your ESP32-DevKitM-1.
Attention
ESP32-DevKitM-1 is a board with a single core module, please enable single core mode
(CONFIG_FREERTOS_UNICORE) in menuconfig before flashing your applications.
Hardware Reference
Block Diagram
A block diagram below shows the components of ESP32-DevKitM-1 and their
interconnections.

ESP32-DevKitM-1
Power Source Select
There are three mutually exclusive ways to provide power to the board:
•Micro USB port, default power supply
•5V and GND header pins
•3V3 and GND header pins
Warning
•The power supply must be provided using one and only one of the options
above, otherwise the board and/or the power supply source can be damaged.
•Power supply by micro USB port is recommended.
Pin Descriptions
The table below provides the Name and Function of pins on both sides of the board. For
peripheral pin configurations, please refer to ESP32 Datasheet.

No.
Name
Type
Function
1
GND
P
Ground
2
3V3
P
3.3 V power supply
3
I36
I
GPIO36, ADC1_CH0, RTC_GPIO0
4
I37
I
GPIO37, ADC1_CH1, RTC_GPIO1
5
I38
I
GPIO38, ADC1_CH2, RTC_GPIO2
6
I39
I
GPIO39, ADC1_CH3, RTC_GPIO3
7
RST
I
Reset; High: enable; Low: powers off
8
I34
I
GPIO34, ADC1_CH6, RTC_GPIO4
9
I35
I
GPIO35, ADC1_CH7, RTC_GPIO5
10
IO32
I/O
GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator
input), ADC1_CH4, TOUCH9, RTC_GPIO9
11
IO33
I/O
GPIO33, XTAL_32K_N (32.768 kHz crystal oscillator
output), ADC1_CH5, TOUCH8, RTC_GPIO8
12
IO25
I/O
GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0
13
IO26
I/O
GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1
14
IO27
I/O
GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17,
EMAC_RX_DV
15
IO14
I/O
GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS,
HSPICLK, HS2_CLK, SD_CLK, EMAC_TXD2
16
5V
P
5 V power supply
17
IO12
I/O
GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI,
HSPIQ, HS2_DATA2, SD_DATA2, EMAC_TXD3
18
IO13
I/O
GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK,
HSPID, HS2_DATA3, SD_DATA3, EMAC_RX_ER
19
IO15
I/O
GPIO15, ADC2_CH3, TOUCH3, RTC_GPIO13, MTDO,
HSPICS0, HS2_CMD, SD_CMD, EMAC_RXD3

No.
Name
Type
Function
20
IO2
I/O
GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP,
HS2_DATA0, SD_DATA0
21
IO0
I/O
GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11,
CLK_OUT1, EMAC_TX_CLK
22
IO4
I/O
GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD,
HS2_DATA1, SD_DATA1, EMAC_TX_ER
23
IO9
I/O
GPIO9, HS1_DATA2, U1RXD, SD_DATA2
24
IO10
I/O
GPIO10, HS1_DATA3, U1TXD, SD_DATA3
25
IO5
I/O
GPIO5, HS1_DATA6, VSPICS0, EMAC_RX_CLK
26
IO18
I/O
GPIO18, HS1_DATA7, VSPICLK
27
IO23
I/O
GPIO23, HS1_STROBE, VSPID
28
IO19
I/O
GPIO19, VSPIQ, U0CTS, EMAC_TXD0
29
IO22
I/O
GPIO22, VSPIWP, U0RTS, EMAC_TXD1
30
IO21
I/O
GPIO21, VSPIHD, EMAC_TX_EN
31
TXD0
I/O
GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2
32
RXD0
I/O
GPIO3, U0RXD, CLK_OUT2