Template: ESP32 S2 Guide

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Development Languages

ESP32-S2-Pico, ESP32-S2-LCD-0.96 can use CircuitPython, MicroPython, C/C++(Arduino, ESP-IDF) to develop products rapidly. The following are the brief introductions of three development manners.

CircuitPython

As a programming language,CircuitPython is designed to simplify coding experimentation and learning on low-cost microcontroller boards, is an open-source derivative of the MicroPython programming language that aimed at students and beginners, and developed and maintained by Adafruit Industries.

MicroPython

Micropython is a lean and efficient implementation of the Python 3 programming language that includes a small portion of the Python standard library and is optimized to run on microcontrollers and constrained environments.

C/C++ (Arduino, ESP-IDF)

Espressif official C/C++ library is easy for quick installment, please check the links below:

Setup Environment

The environment is set under the Windows 10 system, the users can develop by using Arduino or ESP-IDF and Visual Studio Code as IDE. For Mac/Linux operating system users, please refer to the official instruction.

Arduino

1. Downloading and installing Arduino IDE, please pay attention to the default configuration and the full English path.
ESP32 One 020.jpg
2, Arduino install ESP32 library, detail install process is shown below, please refer to related information for more information.
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
ESP32-S2-Pico 005.jpg ESP32-S2-Pico 006.jpg
3, Open the VSCode, install Arduino and C/C++plugin (Microsoft Publisher)
ESP32 One 021.jpg
4, After installing plugin ,press F1 to enter Preferences Open Settings(UI),press Enter to find Arduino plugin setting.
ESP32 One 024.jpg
5, Press F1 to enter Arduino Board Config, then press Enter.
ESP32 One 025.jpg

ESP-IDF

1, Download and install the latest offline version of esp-idf-tools-setup, and place in the full English path and use the default configuration (automatic installation of ESP-IDF, Python, Git, and setting environment variables), place the path of ESP-IDF elsewhere.

ESP32-S2-Pico 007.jpg

2, Download and install VS Code, place in the full English path, and use the default configuration.

ESP32 One 002.jpg

3, Open VS Code,press Ctrl+P,enter ext esp-idf-extension to install configuration plugin.

ESP32 One 003.jpg

4, Press F1 in VSCode, enter Configure ESP-IDF extension to open the configure screen, and then choose USE EXISTING SETUP.

ESP32 One 004.jpg
ESP32 One 014.jpg
ESP32 One 006.jpg
ESP32 One 007.jpg

CircuitPython

  1. Install ESP-IDF by referring to the chapter on environment settings, and then start the esp-idf environment in cmd
  2. Press and hold the BOOT button on the board, and then connect the USB cable
  3. Find the COM port corresponding to the device manager
  4. Modify the COM port enumerated by the user's computer in the following command, and enter the following command to clear the flash
esptool.py --chip esp32-s2 --port COM96 erase_flash
  1. Put the following bootloader.bin and other files (sample demo) into the directory where esp-idf is installed, and then enter the following command, pay attention to the COM port enumerated by the user's computer
esptool.py --chip esp32s2 -p COM96 -b 460800 --before=default_reset --after=no_reset write_flash --flash_mode dio --flash_freq 80m --flash_size 4MB 0x8000 partition-table.bin 0xe000 ota_data_initial.bin 0x1000 bootloader.bin 0x2d0000 tinyuf2.bin
  1. Then the disk will appear, and then drag CircuitPython's uf2 firmware to the disk
  2. Install and open Thonny[1], select Tools->Options and set as shown below

Thony.png

MicroPython

1. Install ESP-IDF by referring to the chapter on environment settings, and then start the esp-idf environment in cmd 2. Press and hold the BOOT button on the board, and then connect the USB cable 3. Find the COM port corresponding to the device manager 4. Modify the COM port enumerated by the user's computer in the following command, and enter the following command to clear the flash

esptool.py --chip esp32-s2 --port COM96 erase_flash

5.Put the following bin file(demo)into the directory where esp-idf is installed, then enter the following command, pay attention to the COM port in the computer

esptool.py --chip esp32s2 --port COM96 write_flash -z 0x1000 ESP32_S2_WROVER-20220117-v1.18.bin

6.Install and open Thonny, select Tools->Options and set as shown below

Thonny.png

7.Refer to MicroPython documentation] [releases note]

Hardware Connection

  • Connect the Raspberry Pi Pico expansion board to ESP32-S2-Pico or ESP32-S2-LCD-0.96 in a stacked manner, be careful to avoid pin cross-use, such as serial expansion board of GPIO pins in the same position
  • Do not block the antenna part of ESP32-S2-Pico or ESP32-S2-LCD-0.96, and it's necessary to adjust the board orientation if the Wifi signal is poor.
  • To download the program, you need to press and hold the BOOT button and then press the RESET button to release, Or disconnect the USB, then press and hold the BOOT button to power on. At this time, the UART0 (GPIO43, GPIO44) and USB of ESP32-S2 can be used for flash programs
  • ESP32-S2-Pico or ESP32-S2-LCD-0.96 will print the status information of ESP32-S2 when powered on by default. If you want to cancel, you need to write parameters to the register as shown in the figure below. Note that it cannot be restored after modifying.

Examples

This section combines Arduino, Raspberry Pi Pico expansion board, using AD/DA, SPI, I2C, WiFi, and other peripherals of ESP32-S2.

ADC/DAC

  • Be careful to configure as shown in the following below, enable USB CDC, and select USB update mode
  • If there is an error in the download as shown in the figure below, indicating that you need to manually reset the board to run the program after downloading.
ESP32-S2-Pico 008.jpg
Codes
  • definite four AD, one DA macro, initialize the DA value of 127, and the USB serial output in the setup() function.
#define adc0 6
#define adc1 7
#define adc2 8
#define adc3 1
#define dac_pin 17

uint16_t adc_Value = 0;    // variable to store the value coming from the sensor
uint8_t dac_value = 127; //DA output value

void setup() {
  // put your setup code here, to run once:
  HWSerial.begin(115200);
  HWSerial.setDebugOutput(true);
  
  USB.onEvent(usbEventCallback);
  USBSerial.onEvent(usbEventCallback);
  
  USBSerial.begin();
  USB.begin();

  delay(4000);
//  USBSerial.printf("Setup done");
}
  • DA increases 1 every 5 seconds and loops from 0 until 255. Use one of the AD pins to connect DA to detect the operation of DA. Lines 28 to 30 are battery voltage detection.

UART

  • Need to select configuration options as shown in AD_DA demo download, enable USB CDC, and select USB update mode
  • If there is an error message in the download, as shown in the AD_DA demo download, and it needs to be reset manually after downloading to run the program.
  • UART demo combined with Pico-GPS-L76B to read NMEA, parse and convert the coordinate system and output, etc.
Codes
  • Include NMEA0183 library, instantiate NMEA0183Msg, NMEA0183, specify the pin of serial 1
  • Specify the NMEA0183 data stream serial and baud rate in the NMEA0183.Begin() function, initialize the USB serial function, The loop() function polls the NMEA0183 data stream and then receives it

I2C

Take care to select configuration options as shown in AD_DA routine download, enable USB CDC and select USB update mode

There is an error message in the download, as shown in the AD_DA routine download, and it needs to be reset manually after the download is complete to run the program

This demo uses I2C to read the accelerometer, gyroscope, geomagnetometer, and barometer data on the Pico-10DOF-IMU, and then fuses the data to calculate the current attitude. When powering on, please place the sensor according to the serial port information for local geomagnetic calibration.

After the program download is complete, press the reset button, open the sscom serial port assistant, select the corresponding COM port, select DTR and wait for the serial port to output the corresponding information for calibration

SERIAL.png

SPI

  • You need to select the configuration, as shown in the AD_DA routine download, enable USB CDC, and select update mode
  • If there is an error message in the download, as shown in the AD_DA demo download, and it needs to be reset manually after downloading to run the program.
  • This example tests the LCD of ESP32-S2-LCD-0.96 and scans WiFi hotspot information and then prints it
Codes

Initiate USB serial and the STA mode of Wifi in setup(), turn on the LCD display in the loop() function, and print out the scanned WiFi information of the USB serial.