HTU21D/
├── htu21d.py          # HTU21D 核心驱动文件
├── main.py            # 测试示例代码
└── README.md          # 说明文档

import time
from machine import I2C, Pin
from htu21d import HTU21D


# ======================================== 全局变量 ============================================

# I2C bus configuration
I2C_ID = 0
SDA_PIN = 4
SCL_PIN = 5
FREQ = 100000

# Print interval in milliseconds
PRINT_INTERVAL_MS = 2000

# HTU21D I2C device address
DEVICE_ADDRESS = 0x40


# ======================================== 功能函数 ============================================

def scan_bus(i2c: I2C) -> list:
    devices = i2c.scan()
    print("I2C devices found: %s" % [hex(addr) for addr in devices])
    return devices


# ======================================== 初始化配置 ==========================================

time.sleep(3)
print("FreakStudio: Using HTU21D temperature and humidity sensor ...")

i2c = I2C(I2C_ID, scl=Pin(SCL_PIN), sda=Pin(SDA_PIN), freq=FREQ)

devices = scan_bus(i2c)
if len(devices) == 0:
    raise RuntimeError("No I2C device found on bus")

if DEVICE_ADDRESS not in devices:
    raise RuntimeError(
        "HTU21D not found at address 0x%02X. Check VCC, GND, SDA=GP%d, SCL=GP%d."
        % (DEVICE_ADDRESS, SDA_PIN, SCL_PIN)
    )
print("Device found at address 0x%02X" % DEVICE_ADDRESS)

sensor = HTU21D(i2c, addr=DEVICE_ADDRESS)


# ========================================  主程序  ===========================================

try:
    last_print_time = time.ticks_ms()
    while True:
        current_time = time.ticks_ms()
        if time.ticks_diff(current_time, last_print_time) >= PRINT_INTERVAL_MS:
            try:
                temp = sensor.temperature
                humi = sensor.humidity
                print("Temperature: %.2f C  Humidity: %.2f %%RH" % (temp, humi))
            except RuntimeError as e:
                print("Sensor read error: %s" % str(e))
            last_print_time = current_time
        time.sleep_ms(100)

except KeyboardInterrupt:
    print("Program interrupted by user")
except OSError as e:
    print("Hardware communication error: %s" % str(e))
except Exception as e:
    print("Unknown error: %s" % str(e))
finally:
    print("Cleaning up resources...")
    sensor.deinit()
    del sensor
    del i2c
    print("Program exited")