esp32智能小车自动定位代码

ESP32作为物联网开发板常用于制作智能小车，其中自动定位通常是通过集成GPS模块来实现的。以下是一个基本的ESP32 + GPS自动定位代码示例，使用MicroPython编写：

import ubinascii
import machine
import network
import gc
from umqtt.simple import MQTTClient

# 定义配置
MQTT_SERVER = 'your_mqtt_server'
MQTT_PORT = 1883
MQTT_USER = 'your_username'
MQTT_PASS = 'your_password'
GPS_TOPIC = "smartcar/location"

# 准备Wi-Fi连接
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect('your_ssid', 'your_password')

# 等待Wi-Fi连接成功
while not sta_if.isconnected():
    pass

print("Connected to WiFi")

# 创建GPS实例并初始化
gc.collect()
uart = machine.UART(0, baudrate=9600, tx=27, rx=26)

def get_location():
    loc_str = uart.readline().decode('utf-8').strip()
    lat, lon = loc_str.split(',')
    return float(lat), float(lon)

client = MQTTClient("esp32_client", MQTT_SERVER, port=MQTT_PORT,
                    user=MQTT_USER, password=MQTT_PASS)
client.connect()

try:
    while True:
        lat, lon = get_location()
        client.publish(GPS_TOPIC, f"{lat},{lon}")
        print(f"Publishing location: ({lat}, {lon})")
        time.sleep(5)  # 发送位置信息的频率

finally:
    client.disconnect()
    sta_if.disconnect()