ESP32-S2-Pico

Overview

This is a compact WiFi development board with plenty of peripheral interfaces, integrated low-power WiFi System-on-Chip (SoC), and a mass memory, supporting the Raspberry Pi Pico expansion board ecosystem. Equipped with a hardware crypto accelerator, RNG, HMAC, and Digital Signature module, it can meet the security requirements of the Internet of Things. Multiple low-power operating states to satisfy power requirements in IoT, mobile devices, wearable electronics, smart homes, and other application scenarios, etc.

Features

ESP32-S2 Standard Ver.

Support Raspberry Pi Pico expansion board ecosystem to satisfy creative IoT application development.
Xtensa single-core 32-bit LX7 microprocessor, ESP32-S2FH4, supports clock frequency up to 240 MHz.
Integrated 320KB SRAM, 128KB ROM, 8MB PSRAM, 4MB Flash memory.
Support IEEE802.11 b/g/n, on-board 2.4 GHz WiFi ceramic antenna, up to 150 Mbps data transfer rate.
USB-C connector, no more plug orientation problem.
On-chip integrated full-speed USB OTG interface, LCD interface (8-bit serial RGB/8080/6800), TWAI controller (ISO11898-1 compatible), capacitive sensor GPIO, temperature sensor, and RMT (TX/RX).
On-board 1.8A current high-efficiency boost/buck DC-DC TPS63000 power supply IC.
Support a variety of low-power operating states for adjusting the optimal balance between communication distance, data rate, and power consumption, to meet the power requirements of various application scenarios.
Castellated module allows soldering direct to user-designed carrier boards.

ESP32-S2 LCD

All features of the ESP32-S2 Standard Ver.
On-board 0.96inch 160×80 pixels 65K color IPS LCD display.
On-board single 3.7V lithium battery charge/discharge header, suitable for mobile IoT product design.

Pinout

ESP32-S2-Pico, ESP32-S2-LCD-0.96 bring out the same pins, all the pins can be set to SPI, I2C, UART, TWAI, AD/DA, I2S hardware functions through the powerful IO MUX of ESP32-S2,

Putting the default UART0 pin in a fixed position, do not recommend setting it to other functions
ESP32-S2 has 2 x 8-bit DACs independent operating channel
The USB pins of ESP32-S2(GPIO19, GPIO20) can be used for firmware downloading and serial debugging
For more details, please check ESP32-S2 Datasheet, Chapter 3.10 Peripheral Pin Assignments, and the schematic

ESP32-S2-Pico
ESP32-S2-LCD-0.96inch

Dimensions

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.

Circuitpython's related application development reference Development Documentation
Github library of Circuitpython can be recompiled for custom development.
Related firmware of Circuitpython for different ESP32-S2 core boards.

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.

Micropython related application development reference Development Documentation
Github library of Micropython can be recompiled for custom development
Related firmware of Micropython on different ESP32-S2 core boards

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

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

Arduino development manual of ESP32-S2
ESP-IDF development manual of ESP32-S2

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.
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
https://www.arduino.cn/package_esp32_dev_index.json

3, Open the VSCode, install Arduino and C/C++plugin (Microsoft Publisher)
4, After installing plugin ,press F1 to enter Preferences Open Settings(UI),press Enter to find Arduino plugin setting.
5, Press F1 to enter Arduino Board Config, then press Enter.

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.

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

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

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

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

5. 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

6. Then the disk will appear, and then drag CircuitPython's uf2 firmware to the disk.
7. Install and open Thonny[1], select Tools->Options and set as shown below:

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.

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 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 modification.

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.

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.

/*
 * NMEA0183 library is from https://github.com/ttlappalainen/NMEA0183
 * Thanks to ttlappalainen 
 */
#include "NMEA0183.h"
#include "NMEA0183Msg.h"
#include "NMEA0183Messages.h"
#include "USB.h"

#if ARDUINO_USB_CDC_ON_BOOT
#define HWSerial Serial0
#define USBSerial Serial
#else
#define HWSerial Serial
USBCDC USBSerial;
#endif

tNMEA0183Msg NMEA0183Msg;
tNMEA0183 NMEA0183;

#define RXD2 3
#define TXD2 2

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 the 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, and 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.

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 the WiFi hotspot 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.

void setup() {
  HWSerial.begin(115200);
  HWSerial.setDebugOutput(true);
  
  USB.onEvent(usbEventCallback);
  USBSerial.onEvent(usbEventCallback);
  
  USBSerial.begin();
  USB.begin();

  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);

  USBSerial.printf("Setup done");
}

void loop() {
//  USBSerial.printf("This is a test\r\n");

  led_init();
  led_test();
  
  lcd_dev.lcd_init();
  lcd_dev.lcd_test();

  USBSerial.printf("scan start\r\n");

    // WiFi.scanNetworks will return the number of networks found
    int n = WiFi.scanNetworks();
    USBSerial.printf("scan done\r\n");
    if (n == 0) {
        USBSerial.printf("no networks found\r\n");
    } else {
        USBSerial.printf("%d",n);
        USBSerial.printf(" networks found\r\n");
        for (int i = 0; i < n; ++i) {
            // Print SSID and RSSI for each network found
            USBSerial.printf("%d",i + 1);
            USBSerial.printf(": ");
            USBSerial.printf("%s",WiFi.SSID(i));
            USBSerial.printf(" (");
            USBSerial.printf("%d",WiFi.RSSI(i));
            USBSerial.printf(")\r\n");
            delay(10);
        }
    }
    USBSerial.printf("\r\n");

    // Wait a bit before scanning again
    delay(3000);
}

LCD

The LCD driver on ESP32-S2-LCD-0.96 uses ST7735, this summary uses TFT_eSPI library for display, pay attention to install arduino-esp32, TFT_eSPI and other libraries in advance.
Open the User_Setup_Select.h and User_Setups/Setup43_ST7735.h files in the TFT_eSPI library folder (the default installation location, pay attention to the path in the figure below) and modify them as shown in the figure.

Add the initialization of the backlight pin to the setup() function of the example file of TFT_eSPI.

E-Paper

Herein we use ESP32-S2-Pico or ESP32-S2-LCD-0.96 and Pico-ePaper-2.13 to demonstrate the Pico-ePaper family of products.
Download and unzip the examples\esp32-waveshare-epd folder in the e-Paper ESP32 Driver Board to the Arduino\libraries folder, then open the Arduino\libraries\esp32-waveshare-epd\src\DEV_Config.h file to change the relevant pins, as the picture shows:

Open Arduino IDE, select the model in File->Examples->waveshare-e-Paper and compile and download, as shown in the figure:

Resource

Documents

Software

Examples

Datasheet

FAQ

Question:How can I use the virtual serial port of the ESP32-S2-Pico and ESP-S2-LCS-0.96 USB?

Answer:

As there is no USB to UART chip, we need to use the USB port of the ESP32-S2 to download the demo and print the information via the virtual serial ports. You can refer to the demo example chapter for the operation of Arduino. In the IDE environment of ESP-IDF+VSCODE, the USB virtual serial port can directly use esp-idf\examples\peripherals\usb\tusb_console project, and you can refer to the GIF below:

1. Before downloading the demo via the USB port, you can enter the download mode on the ESP32-S2-Pico by yourself. Method 1: After connecting the USB, you need to press and hold the BOOT key and release it after pressing the RESET key. Method 2: Disconnect the USB, press and hold the BOOT key to power on, and then press F1 to select the COM port.
2. USB download COM port and USB virtual serial COM port is not the same, after downloading the program, you need to manually press the RESET button to reset the application and then switch the virtual serial COM number on vscode again to display the print information.

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Support

If you require technical support, please go to the Support page and open a ticket.

Navigation menu

ESP32-S2-Pico

Contents

Overview

Features

ESP32-S2 Standard Ver.

ESP32-S2 LCD

Pinout

Dimensions

Development Languages

CircuitPython

MicroPython

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

Setup Environment

Arduino

ESP-IDF

CircuitPython

MicroPython

Hardware Connection

Examples

ADC/DAC

Codes

UART

Codes

I2C

SPI

Codes

LCD

E-Paper

Resource

Documents

Software

Examples

Datasheet

FAQ

Question:How can I use the virtual serial port of the ESP32-S2-Pico and ESP-S2-LCS-0.96 USB?

Support