This article introduces the method of using UNO D1 R32 (ESP32) development board to build an embedded development environment.

 

What is ESP32?

In the words of the manufacturer, ESP32 is made with 40 nm process, which has the best power performance, radio frequency performance, stability, versatility and reliability, and is suitable for various application scenarios and different power consumption requirements. The following are the main parameters of ESP32:

project	Value
Number of cores	2
Architecture	32bit
Wifi	Yes
Bluetooth	Yes
RAM	512K
Flash memory	16M
GPIO	36
Protocol	SPI, IIC, I2S, UART, CAN
ADC (Analog to Digital Converter)	18 channels 12 bits
DAC (Digital to Analog Converter)	2 channels 8 bits
Memory card interface	1
Temperature Sensor	1

It can be seen from the chip parameters of ESP32 that its function is very powerful; the other is also very important: it is very cheap. These two elements determine: it is very suitable for the current popular Internet of Things development, but also very suitable for learning embedded development.

 

Prepare the hardware

Since it is embedded development, it will inevitably involve input. There are generally two ways to choose the simplest ESP32 development board, but this requires us to prepare input and output expansion ourselves. Although it is not too difficult, it is always troublesome. We choose another way: UNO D1 R32 development board following the Ardino specification:

By comparing with a dollar coin, we can know that UNO D1 R32 is still very small.

 

Install Arduino

The description of Arduino in Baidu Encyclopedia is as follows:

Arduino is a convenient, flexible, and easy to use open source electronic prototype platform. Contains hardware (various types of Arduino boards) and software (ArduinoIDE). It was developed by a European development team in the winter of 2005. Its members include Massimo Banzi, David Cuartielles, Tom Igoe, Gianluca Martino, David Mellis and Nicholas Zambetti. It is built on the open source simple I/O interface version, and has a Processing/Wiring development environment similar to Java and C language. It mainly includes two parts: the hardware part is the Arduino circuit board that can be used for circuit connection; the other is the Arduino IDE, the program development environment in your computer. You only need to write the program code in the IDE, upload the program to the Arduino board, and the program will tell the Arduino board what to do.

What to do is actually very simple: go to the following webpage to download and install the ArduinoIDE software.

https://www.arduino.cc/en/Main/Software

You can also download directly using the link below.

Window Installer

 

Install ESP32 Development Kit

There are several ways to install ESP32 in ArduinoIDE. The last one is the reference document (the one with twists and turns) that is the closest to success, but the process of downloading the installation package is still twists and turns. The main problem is that the file download is too difficult. Therefore, the author first collected these files and modified the installation steps as follows:

1. Create the espressif/esp32 directory in the hardware directory under the Arduino installation

2. Download the arduino-esp32 support package from github:

3. Unzip the downloaded Zip file to the esp32 directory created in the first step.

4. Enter the espressif/esp32/tools directory and execute get.ext in the directory.

5. Automatic installation. But at the time of the third file, it could not be completed.

You can find the following webpage by searching directly on the Internet: https://github.com/igrr/mkspiffs/releases/tag/0.2.3

You can directly choose to download mkspiffs-0.2.3-arduino-esp32-win32.zip or click the following link to download: https://github.com/igrr/mkspiffs/releases/download/0.2.3/mkspiffs-0.2.3 -arduino-esp32-win32.zip

If you still cannot download, you can use the author's backup file.

6. Enter the espressif/esp32/tools/dist directory:

7. Copy the downloaded mkspiffs-0.2.3-arduino-esp32-win32.zip to the dist directory and execute get.exe again. This time it will end soon.

 

Choose a development board

Start Arduino and enter the Tools menu, and select ESP32 Dev Module as shown below.

 

Action confirmation

Start Arduino and enter the verification program:

void setup() {
  pinMode(2, OUTPUT); //Set pin 2 to output mode
}

void loop() {
     digitalWrite(2, HIGH); // turn on the LED
     delay(500); // wait for 500ms
     digitalWrite(2, LOW); // Turn off the LED
     delay(500); // wait for 500ms
}

Use the MicroUSB cable to connect the computer and UNO D1 R32 development board, and select the port:

There are two points to note here:

1. The port number of the reader's computer may be different. If the port number is gray, you need to install the CH340 driver in the reference information. 2. Use the port on the back of the computer. The author used the USB port on the front panel for a long time but couldn't download the program stably.

Upload the program to UNO D1 R32.

You can also use the upload button [->] in the toolbar to upload the program.

After completion, you can see that the blue LED on the development board starts to flash!

 

Reference Information

Twists and turns, share my esp32 compilation environment to build arduino

https://www.arduino.cn/thread-91658-1-1.html

 

Install ESP32 on Arduino IDE

https://www.yiboard.com/thread-1218-1-1.html

 

Installing the ESP32 Board in Arduino IDE (Windows, Mac OS X, Linux)

https://randomnerdtutorials.com/installing-the-esp32-board-in-arduino-ide-windows-instructions/

 

How to Set Up and Use WeMos TTgo ESP32 Uno D1 R32

https://www.instructables.com/id/How-to-Set-Up-WeMos-TTgo-ESP32-Uno-D1-R32/

 

CH340 driver

http://www.wch.cn/download/CH341SER_EXE.html

 

WeMos R1 R32 ESP32

https://www.fambach.net/wemos-d1-r32-esp32/

 

Original link:

https://github.com/xueweiguo/EmbeddedCpp/blob/master/Arduino/ESP32/Startup/ESP32Startup.md

 

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