RasPi Pico で I2C LCD表示する

Raspberry Pi Picoを買ったのでいじってみることにした
手元にある秋月電子から買ったI2C小型キャラクタLCDモジュールを接続し、Picoの温度センサを表示してみる

開発環境は、mac bookPro Monterey に Thonnyをインストールして行った
Pico の初期設定は省略する
I2C接続小型キャラクタLCDモジュール 8x2行
AQM0802A-RN-GBW
ST7032i

[Pico]
SDA:GP6
SCL:GP7

----- main.py -----
from machine import Pin
from machine import I2C
import time

class st7032i:
LCD_RS_CMD = 0x00
LCD_RS_DATA = 0x40
LCD_CMD_CLEAR = 0x01
LCD_CMD_HOME = 0x03
lcd_bus = 0
my_id = 1
my_freq = 400000
my_sda = Pin(6)
my_scl = Pin(7)
my_addr = int(62)
i2c = I2C

def __init__(self):
    cmd1 = [b'\x38',b'\x39',b'\x14',b'\x70',b'\x56',b'\x6c']
    cmd2 = [b'\x38',b'\x0d',b'\x01']
    self.i2c = I2C(self.my_id, freq=self.my_freq, sda=self.my_sda, scl=self.my_scl)
    addr = self.i2c.scan()
    self.my_addr = [int(n) for n in addr]
    print (self.my_addr[0])
    for order in cmd1:
        self.i2c.writeto_mem(self.my_addr[0], self.LCD_RS_CMD, order)
        time.sleep(0.2)
    for order in cmd2:
        self.i2c.writeto_mem(self.my_addr[0], self.LCD_RS_CMD, order)
        time.sleep(0.2)
    
def char(self, y, x, msg):
    dat = 0x80 + (0x40 * y) + x
    byte = dat.to_bytes(1,'littele')
    #dat = b'\x80'
    self.i2c.writeto_mem(self.my_addr[0],self.LCD_RS_CMD,byte)
    for order in msg:
        self.i2c.writeto_mem(self.my_addr[0],self.LCD_RS_DATA, order)
        #time.sleep(0.2)

if name == 'main':
sensor_temp = machine.ADC(4)
conversion_factor = 3.3 / (65535)
led = Pin(25, Pin.OUT)
#i2c = I2C(1,freq=400000,sda=Pin(6),scl=Pin(7))
#print(i2c.scan())
st = st7032i()
msg = "RPi Pico"
st.char(0, 0, msg)

while True:
  led.value(1)
  time.sleep(0.5)
  led.value(0)
  time.sleep(0.5)
  
  reading = sensor_temp.read_u16() * conversion_factor
  temperature = 27 - (reading - 0.706)/0.001721
  msg = "%3.2f" % temperature
  st.char(1,2, msg)