Mindstorms EV3与PC蓝牙通信及MicroPython跨版本无线传数问询

Hey there! Let's tackle your two questions about EV3 Bluetooth communication step by step.

Getting your EV3 paired and communicating with a PC over Bluetooth is straightforward—here's how to do it:

• Enable Bluetooth on the EV3: Power on your EV3, navigate to Settings > Bluetooth, toggle Bluetooth to On, and set visibility to Visible so your PC can find it. Note down your EV3's device name (it’ll look something like EV3_1234).
• Pair the EV3 with your PC: On your PC, open Bluetooth settings, search for nearby devices, and select your EV3. When prompted for a pairing code, enter 1234 or 0000 (the EV3 screen will show the same prompt—make sure both codes match).
• Choose a communication protocol: For most custom programming (like your MicroPython use case), serial communication is the go-to option. LEGO’s official software uses its own protocol, but serial works best for cross-language data transfer.

Absolutely—this is totally feasible using Bluetooth serial communication. Here’s a step-by-step guide with code examples to make it work:

Prerequisites #

• Ensure your EV3 and PC are already paired (follow step 1 above).
• On your PC, install the pyserial library for serial communication:

  pip install pyserial
  

• Confirm your EV3’s MicroPython firmware supports Bluetooth UART (most modern EV3 MicroPython builds like ev3dev do—if not, flash a compatible firmware first).

Step 1: Find the Bluetooth Serial Port #

• Windows: Open Device Manager, look under "Ports (COM & LPT)" for a "Bluetooth Serial Port" (e.g., COM3).
• Linux/macOS: You’ll need to bind the EV3’s Bluetooth MAC address to an rfcomm port. First, get the EV3’s MAC address from your PC’s Bluetooth settings, then run:

  sudo rfcomm bind 0 AA:BB:CC:DD:EE:FF
  

  This creates a port at /dev/rfcomm0.

Step 2: PC Side (Python 3) Code #

This script sends user input to the EV3 and optionally receives responses:

import serial
import time

# Replace with your PC's Bluetooth serial port
serial_port = 'COM3'  # Windows example; use '/dev/rfcomm0' for Linux/macOS
baud_rate = 9600

# Initialize serial connection
ser = serial.Serial(serial_port, baud_rate, timeout=1)
time.sleep(2)  # Give the connection time to establish

try:
    print("Ready to send data to EV3. Type 'exit' to quit.")
    while True:
        user_input = input("Enter data: ")
        if user_input.lower() == 'exit':
            break
        # Send data (add newline to mark end of message)
        ser.write(f"{user_input}\n".encode('utf-8'))
        # Optional: Read response from EV3
        response = ser.readline().decode('utf-8').strip()
        if response:
            print(f"EV3 says: {response}")
except KeyboardInterrupt:
    print("\nInterrupted by user.")
finally:
    ser.close()
    print("Connection closed.")

Step 3: EV3 Side (MicroPython 2) Code #

This script listens for incoming data and sends a confirmation back:

import machine
import time

# Initialize Bluetooth UART (adjust pins if your firmware uses different ones)
# For ev3dev MicroPython, you might use `import serial` instead of machine.UART
uart = machine.UART(0, baudrate=9600, tx=machine.Pin(1), rx=machine.Pin(0))
time.sleep(1)

print("Waiting for data from PC...")
while True:
    if uart.any():
        # Read incoming data
        received_data = uart.readline().decode('utf-8').strip()
        print(f"Received: {received_data}")
        # Send a response back to PC
        uart.write(f"Got it: {received_data}\n".encode('utf-8'))

Key Notes #

• Baud Rate: Make sure the baud rate matches exactly on both the PC and EV3 (9600 is a safe default, but you can use higher rates like 115200 for faster transfer).
• Firmware Compatibility: If you’re using ev3dev’s MicroPython, the serial setup might differ slightly—check the ev3dev docs for the correct UART initialization.
• Connection Stability: If you experience drops, try re-pairing the devices or ensuring the EV3 has a full battery.

内容的提问来源于stack exchange，提问作者vargaking