How to Use M5Stamp-s3: Examples, Pinouts, and Specs

The M5Stamp-s3 is a compact, low-power microcontroller module developed by M5. It is based on the ESP32-S3 chip, which features dual-core Xtensa LX7 processors, integrated Wi-Fi, and Bluetooth 5.0 connectivity. This module is designed for Internet of Things (IoT) applications, offering a versatile platform for prototyping and deploying smart devices. Its small form factor and GPIO pins make it ideal for interfacing with a wide range of sensors, actuators, and other peripherals.

• Smart home devices (e.g., lighting, thermostats, security systems)
• Wearable technology
• Industrial IoT (monitoring and control systems)
• Wireless data logging and telemetry
• Robotics and automation
• Prototyping for AI and machine learning at the edge

The M5Stamp-s3 features a total of 8 GPIO pins, which can be configured for various functions such as digital I/O, ADC, PWM, I2C, SPI, and UART. Below is the pinout description:

1. Powering the Module:

   • The M5Stamp-s3 can be powered via its USB-C port (5V input) or through the 3V3 pin (3.3V regulated input).
   • Ensure the power supply is stable and within the specified voltage range to avoid damage.

2. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other peripherals.
   • Configure the pins in your firmware for the desired functionality (e.g., digital I/O, ADC, PWM).

3. Programming the Module:

   • The M5Stamp-s3 can be programmed using the Arduino IDE, ESP-IDF, or MicroPython.
   • Install the necessary board support package (BSP) for the ESP32-S3 in your development environment.

4. Uploading Code:

   • Connect the module to your computer via USB-C.
   • Select the appropriate COM port and board type in your IDE.
   • Upload your code to the module.

• GPIO Voltage Levels: The GPIO pins operate at 3.3V logic levels. Avoid applying voltages higher than 3.3V to prevent damage.
• Deep Sleep Mode: Use the deep sleep mode to minimize power consumption in battery-powered applications.
• Antenna Placement: Ensure the module's antenna has sufficient clearance from metal objects to maintain optimal wireless performance.
• Firmware Updates: Regularly update the firmware to benefit from the latest features and bug fixes.

Below is an example of how to use the M5Stamp-s3 to read data from a temperature sensor and send it to a serial monitor:

#include <Wire.h>

// Define the GPIO pin connected to the temperature sensor
#define TEMP_SENSOR_PIN 3

void setup() {
  Serial.begin(115200); // Initialize serial communication at 115200 baud
  pinMode(TEMP_SENSOR_PIN, INPUT); // Set the sensor pin as input
}

void loop() {
  int sensorValue = analogRead(TEMP_SENSOR_PIN); // Read the sensor value
  float temperature = (sensorValue / 1024.0) * 100.0; // Convert to temperature
  
  // Print the temperature to the serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  
  delay(1000); // Wait for 1 second before the next reading
}

1. Module Not Detected by Computer:

   • Ensure the USB-C cable is properly connected and supports data transfer.
   • Check if the correct drivers for the ESP32-S3 are installed on your computer.

2. Code Upload Fails:

   • Verify that the correct COM port and board type are selected in your IDE.
   • Press and hold the BOOT button on the module while uploading the code.

3. Wi-Fi Connection Issues:

   • Double-check the SSID and password in your code.
   • Ensure the module is within range of the Wi-Fi router.

4. High Power Consumption:

   • Use deep sleep mode when the module is idle.
   • Disconnect unused peripherals to reduce power draw.

Q: Can the M5Stamp-s3 be powered by a battery?
A: Yes, the module can be powered by a 3.7V LiPo battery connected to a suitable power management circuit.

Q: Does the M5Stamp-s3 support OTA updates?
A: Yes, the ESP32-S3 chip supports over-the-air (OTA) firmware updates.

Q: Can I use the M5Stamp-s3 with MicroPython?
A: Absolutely! The module is compatible with MicroPython, and you can upload MicroPython firmware to get started.

Q: What is the maximum range of the Wi-Fi connection?
A: The Wi-Fi range depends on environmental factors but typically extends up to 50 meters indoors and 200 meters outdoors.

This concludes the documentation for the M5Stamp-s3. For further assistance, refer to the official M5 documentation or community forums.