How to Use Esp32 S3 Zero: Examples, Pinouts, and Specs

The ESP32 S3 Zero, manufactured by Waveshare (Part ID: ESP32S3Zero), is a low-power, dual-core microcontroller designed for IoT applications. It integrates Wi-Fi and Bluetooth capabilities, making it ideal for wireless communication projects. With a rich set of peripherals, including GPIO, ADC, SPI, and more, the ESP32 S3 Zero is suitable for a wide range of applications, from smart home devices to industrial automation.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable electronics
• Industrial control systems
• Robotics and automation
• Prototyping and educational projects

• Processor: Dual-core Xtensa LX7 at up to 240 MHz
• Memory: 512 KB SRAM, 384 KB ROM, and external flash support
• Wireless Connectivity:
  • Wi-Fi: 802.11 b/g/n (2.4 GHz)
  • Bluetooth: BLE 5.0 and Bluetooth Classic
• GPIO Pins: 45 (configurable for various functions)
• ADC: 12-bit, up to 20 channels
• DAC: 2 channels
• Communication Interfaces: SPI, I2C, UART, I2S, CAN, and more
• Operating Voltage: 3.3V
• Power Consumption: Ultra-low power in deep sleep mode (~10 µA)
• Dimensions: 25 mm x 50 mm
• Operating Temperature: -40°C to 85°C

The ESP32 S3 Zero features a 2.54 mm pitch header with the following pinout:

Note: The ESP32 S3 Zero has additional GPIO pins and peripherals not listed here. Refer to the full datasheet for a complete pinout.

1. Powering the Board:
   • Supply 3.3V to the 3V3 pin and connect GND to ground.
   • Alternatively, use the onboard USB-C connector for power and programming.
2. Connecting Peripherals:
   • Use GPIO pins for digital input/output.
   • Connect sensors to ADC pins for analog input.
   • Use UART, SPI, or I2C for communication with external devices.
3. Programming:
   • The ESP32 S3 Zero can be programmed using the Arduino IDE, ESP-IDF, or MicroPython.
   • Install the necessary drivers and libraries for your development environment.

• Voltage Levels: Ensure all connected peripherals operate at 3.3V logic levels to avoid damage.
• Boot Mode: To enter bootloader mode, hold the BOOT button while pressing the RESET button.
• Power Consumption: Use deep sleep mode for battery-powered applications to minimize power usage.
• Antenna Placement: Ensure the onboard antenna has a clear path for optimal Wi-Fi and Bluetooth performance.

The following example demonstrates how to blink an LED connected to GPIO2 using the Arduino IDE:

// Blink an LED connected to GPIO2 on the ESP32 S3 Zero

#define LED_PIN 2  // Define the GPIO pin for the LED

void setup() {
  pinMode(LED_PIN, OUTPUT);  // Set GPIO2 as an output
}

void loop() {
  digitalWrite(LED_PIN, HIGH);  // Turn the LED on
  delay(1000);                  // Wait for 1 second
  digitalWrite(LED_PIN, LOW);   // Turn the LED off
  delay(1000);                  // Wait for 1 second
}

Tip: Install the ESP32 board package in the Arduino IDE before uploading the code.

1. The board is not detected by the computer:
   • Ensure the USB cable is functional and supports data transfer.
   • Install the correct USB-to-serial driver for the ESP32 S3 Zero.
2. Wi-Fi or Bluetooth is not working:
   • Check the antenna placement and ensure no obstructions are nearby.
   • Verify that the correct Wi-Fi credentials or Bluetooth pairing settings are used.
3. Program upload fails:
   • Ensure the board is in bootloader mode by holding the BOOT button during upload.
   • Check the selected COM port and board type in the Arduino IDE or ESP-IDF.

• Q: Can I power the ESP32 S3 Zero with a battery?
  • A: Yes, you can use a 3.7V LiPo battery with a suitable voltage regulator to provide 3.3V.
• Q: Does the ESP32 S3 Zero support OTA updates?
  • A: Yes, the ESP32 S3 Zero supports Over-The-Air (OTA) firmware updates.
• Q: Can I use the ESP32 S3 Zero with MicroPython?
  • A: Yes, the ESP32 S3 Zero is compatible with MicroPython. Flash the MicroPython firmware to get started.

For additional support, refer to the official Waveshare documentation or community forums.