🛠 Configure M5Stamp Timer Power 2 I/O

M5Stamp Timer Power 2 (PY32L020) · intermediaire · Apprenez à piloter les GPIO, PWM et ADC du module PY32L020 pour interagir avec des capteurs ou affichages.

Objectives

This tutorial guides you through using the 5 programmable IO pins on the M5Stamp Timer Power 2 (SKU S021). Unlike standard boards, this module uses the PY32L020 microcontroller to manage power while offering flexible interfaces. We will configure a GPIO as an output to control an LED and use PWM to modulate a signal, demonstrating I/O versatility without compromising low power consumption (6.72uA in shutdown).

Required Hardware

1x M5Stamp Timer Power 2 Module (S021)
1x USB-C cable for power and programming
1x LED with current-limiting resistor (330Ω) or test module
1x Connecting cables (Dupont)
Software: Arduino IDE or PY32-compatible platform (e.g., M5Burner for initial flashing)

Steps

Physical Connection: Connect VBUS (5V) and GND to your power source. To test an output, connect the selected IO pin (e.g., IO0) to the LED anode via the resistor, and the cathode to GND.

Software Configuration: Open your IDE. Ensure the board is recognized as a PY32L020 device. Include necessary libraries for this module's specific pin management.

#include <Arduino.h>

// Pin definitions based on module schematic
#define LED_PIN 0 // Programmable IO0
#define PWM_PIN 1 // IO1 for PWM

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(PWM_PIN, OUTPUT);
  // Initialize serial for debugging if needed
  Serial.begin(115200);
}

Program the Main Loop: In loop(), we will toggle the GPIO state and vary the PWM duty cycle. Note that the module manages internal power (3V3_DCDC_OUT) for connected peripherals if needed.

void loop() {
  // Simple GPIO activation
  digitalWrite(LED_PIN, HIGH);
  delay(500);
  digitalWrite(LED_PIN, LOW);
  delay(500);

  // PWM Modulation (analog) on IO1
  for(int i = 0; i <= 255; i++) {
    analogWrite(PWM_PIN, i);
    delay(5);
  }
  for(int i = 255; i >= 0; i--) {
    analogWrite(PWM_PIN, i);
    delay(5);
  }
}

Power Management: To optimize consumption, ensure unused pins are set to high impedance (INPUT_FLOATING) or pull-down inputs if inactive, to prevent leakage currents that would increase consumption beyond the 12.27uA standby rate.

Verification

Observe the LED blinking and progressive brightness variation (if connected to the PWM pin). Use a multimeter to verify output voltage matches expected logic levels (0V or ~3.3V). Also, check that module consumption remains low when I/Os are inactive.

Code examples for this board

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