ESP32-S2-Pico

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ESP32-S2-Pico
ESP32 S2 Pico
ESP32 S2 Pico M
ESP32 S2 LCD 0.96
ESP32 S2 LCD 0.96 M

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Overview

ESP32-S2-Pico and ESP32-S2-LCD-0.96 are compact WiFi development boards with plenty of peripheral interfaces, integrated low-power WiFi System-on-Chip (SoC), and mass memory, supporting the Raspberry Pi Pico expansion board ecosystem. Equipped with a hardware crypto accelerator, RNG, HMAC, and a 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, onboard 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 0.96-inch 160×80 pixels 65K color IPS LCD display.
  • On-board single 3.7V lithium battery charge/discharge header, suitable for mobile IoT product design.

Hardware Description

  • ESP32-S2-Pico/ESP32-S2-LCD-0.96 supports connecting to Pico. Pay attention to avoid using overlapping pins.
  • Do not cover the antenna of ESP32-S2-Pico/ESP32-S2-LCD-0.96, if the WiFi signal is weak, you can try to adjust the board's orientation.
  • When downloading the demo, you should disconnect the Type-C USB first, press and hold the BOOT key before connecting the Type-C USB for power, or follow the steps below:
    • Press and hold the BOOT key, and then press the RESET key.
    • Release the RESET button first and then release the BOOT button.
  • ESP32-S2-LCD-0.96 has a built-in single-cell 3.7V lithium battery charging and discharging interface using an MX1.25 connector. Pay attention to the polarity of the battery.

Pinout

ESP32-S2-Pico and 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-Pico-details-9-1.jpg
ESP32-S2-LCD-0.96inch
ESP32-S2-Pico-details-9-2.jpg

Dimensions

ESP32-S2-Pico-details-size.jpg

Development Languages

ESP32-S2-Pico, ESP32-S2-LCD-0.96 can use CircuitPython, MicroPython, and C/C++(Arduino, ESP-IDF) to develop products rapidly. The following are 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 is 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 installs the ESP32 library, the detailed 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
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 the plugin, press F1 to enter Preferences Open Settings(UI), press Enter to find the 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 it 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 select USE EXISTING SETUP.

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

CircuitPython

1. Download and install the latest Thonny IDE, open Thonny IDE -> Configure interpreter..., as shown below:
CircuitPython Thonny01.jpg
2. Press and hold the BOOT button on the board, and then connect the USB cable. Find the corresponding COM port or the device manager. Download and run the demo. See the Hardware Connections section for details.
3. Follow the steps in the figure below to select the CircuitPython firmware download for ESP32-S2. The Flash content of ESP32-S2-Pico will be cleared before the download, and the whole download process will last about 1 minute.
CircuitPython Thonny02.jpg
4. Please refer to CircuitPython Documentation to program.

MicroPython

1. Download and install the latest Thonny IDE, open Thonny IDE -> Configure interpreter..., as shown below:
CircuitPython Thonny06.jpg
2. Press and hold the BOOT button on the board, and then connect the USB cable. Find the corresponding COM port or the device manager. Download and run the demo. See the Hardware Connections section for details.
3. Follow the steps in the figure below to select the ESP32-S2 online MPY firmware download. The Flash content of ESP32-S2-Pico will be cleared before the download, and the whole download process will last about 1 minute.
CircuitPython Thonny03.jpg
4. If you need to download offline firmware ESP32_S2_WROVER-20220117-v1.18.bin on the Thonny IDE, you should operate it according to the following figure. Choose one from Step 3 and Step 4. It is recommended to follow Step 4.
CircuitPython Thonny04.jpg
5. Refer to MicroPython documentation and releases note.


Examples

Arduino Example

  • In this section, we will combine Arduino, and the Pico expansion board, and utilize ESP32-S2's peripherals such as AD/DA, SPI, I2C, WiFi, etc.
  • Please note that USB virtual serial port output requires selecting the option shown in the diagram below. Additionally, include the code to enable the USB virtual serial port in your program. You can refer to File->Examples->USB->USBSerial for code.

ADC/DAC

  • Be careful to configure as shown in the 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 by 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.
void setup() {
  // put your setup code here, to run once:
  Serial1.begin(9600,SERIAL_8N1,RXD2,TXD2);
  NMEA0183.Begin(&Serial1,1, 9600);

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

  delay(4000);
}

void loop() {
  // put your main code here, to run repeatedly:
  tNMEA0183Msg NMEA0183Msg;
  while (NMEA0183.GetMessage(NMEA0183Msg)) {
  USBSerial.printf(NMEA0183Msg.Sender());
  USBSerial.printf(NMEA0183Msg.MessageCode());
  for (int i=0; i < NMEA0183Msg.FieldCount(); i++) {
    USBSerial.printf(NMEA0183Msg.Field(i));
  }
  USBSerial.printf("\n");

   /*
    * To Be Done
    * WGS84 coordinate convert to GCJ02 coordinate
    */
    
  }
}

I2C

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

There is an error message in the download, as shown in the AD_DA demo 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 demo 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 demo 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 demo.
  • This example tests the LCD of ESP32-S2-LCD-0.96 and scans the WiFi hotspot and then prints it.
Codes

Initiate the USB serial and the STA mode of Wifi in setup(), turn on the LCD 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.
ESP32-S2-Pico-lcd.png
Add the initialization of the backlight pin to the setup() function of the example file of TFT_eSPI.
ESP32-S2-Pico-lcd2.png

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:
Pico-epaper.png
Open Arduino IDE, select the model in File -> Examples -> waveshare-e-Paper, and compile and download, as shown in the figure: Pico-epaper2.png

MPY Example

MPY stands for MiroPython, and in this section, we combine MPY, the Pico expansion board, with detailed examples in the MicroPython folder of the sample demo, see Micropython Documents.

Resource

Documents

Software

Examples

Datasheet

FAQ

 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. The USB download COM port and USB virtual serial COM port are 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.
ESP32-S2-Pico 019.gif

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