sht2x driver for MicroPython

sht2x.py

import utime as time
import umachine as machine

sht20_i2c_addr = 0b1000000  #0b1000000 = 0x40
cmd_reset = 0b11111110 # 0b11111110 = 0xFE
cmd_trigger_temp_measurement_with_hold = 0b11100011
cmd_trigger_humi_measurement_with_hold = 0b11100101
cmd_trigger_temp_measurement_without_hold = 0b11110011
cmd_trigger_humi_measurement_without_hold = 0b11110101
cmd_user_register_read = 0b11100111

class SHT20Drv:
  def __init__(self, i2c):
    if type(i2c) is not machine.I2C:
      raise ValueError("not a valid i2c object")
    self.i2c = i2c
    
  def soft_reset(self):
    self.i2c.send(cmd_reset, sht20_i2c_addr)
  
  def readTemp(self):
    self.i2c.send(cmd_trigger_temp_measurement_with_hold, sht20_i2c_addr)
    time.sleep_ms(80)
    ret = self.i2c.recv(3, sht20_i2c_addr)
    raw = (ret[0] << 8) + ret[1]
    raw &= ~0x0003;
    return (self.temp_conversion(raw), raw, ret[2])
  
  def readHumi(self):
    self.i2c.send(cmd_trigger_humi_measurement_with_hold, sht20_i2c_addr)
    time.sleep_ms(29)
    ret = self.i2c.recv(3, sht20_i2c_addr)
    raw = (ret[0] << 8) + ret[1]
    raw &= ~0x0003;
    return (self.humi_conversion(raw), raw, ret[2])
  
  def temp_conversion(self, raw):
    conversion = -46.85 + (175.72 * raw) / 2**16
    return conversion
    
  def humi_conversion(self, raw):
    conversion = -6 + (125 * raw) / 2**16
    return conversion
  
  def readUserRegister(self):
    self.i2c.send(cmd_user_register_read, sht20_i2c_addr)
    return self.i2c.recv(1, sht20_i2c_addr)