Raspberry Pi picoでI2C接続の温度センサーADT7410をMicroPythonで使う

from machine import I2C
from machine import Pin
import utime


i2c_address = 0x48
SCL = Pin(5)    # GPIO5 (pin number 7)
SDA = Pin(4)    # GPIO4 (pin number 6)


class adt7410_class:

    def __init__(self, i2c, i2c_address):
        self.i2c = i2c
        self.i2c_address = i2c_address
        self.reset()

    def reset(self):
        # リセット
        self.i2c.writeto(self.i2c_address, bytearray([0x2f]))
        # リセット後、動作するまでに200ms必要
        utime.sleep(200/1000)

    def readdata(self):
        # 16bit 1-shot
        data = [0xa0]

        # 13bit 1-shot
        #data = [0x20]

        self.i2c.writeto_mem(self.i2c_address, 0x03, bytearray(data))
        read_wait_time = utime.ticks_ms()
        read_wait = 22
        utime.sleep(0.01*read_wait)

        # 気温データを読み取りできる状態になるまで待機
        # (ステータスレジスタのbit7が0になると準備OK)
        count001 = 0
        while True:
            utime.sleep(0.01)
            # ステータスレジスタの読み込み
            status_reg = bytearray(self.i2c.readfrom_mem(self.i2c_address, 0x02, 1))
            if count001 >= 500:
                break
            if ((int(status_reg[0]) >> 7) & 1) == 0:
                break
            count001 += 1
        status_str = "status=0x{0:02x}, count001={1:d}, {2:d} ms".format(status_reg[0], count001, (utime.ticks_ms()-read_wait_time))
#        print(status_str)

        # 気温データの読み取り
        temp_raw = bytearray(self.i2c.readfrom_mem(self.i2c_address, 0, 2))
#        print("temp_raw = 0x{0:02x}, 0x{1:02x}".format(temp_raw[0], temp_raw[1]))

        # 16bitの計算
        temp = ((temp_raw[0]) << 8) | (temp_raw[1])
        if temp >= 32768:
            temp = temp - 65536
        temp = temp / 128.0

        # 13bitの計算
        #temp = (((temp_raw[0]) << 8) | (temp_raw[1])) >> 3
        #if temp >= 4096:
        #    temp - 8192
        #temp = temp / 16

        return temp



if __name__ == '__main__':
    i2c = I2C(0, freq=400000, scl=SCL, sda=SDA)
    adt7410_01 = adt7410_class(i2c, i2c_address)
    while True:
        temp = adt7410_01.readdata()
        print ("Temp   : {0:.4f} degC".format(temp))
        utime.sleep(5)