同步测试 sht3X、sht2X 两个的温湿度模块

顺手打发时间，写了一下模块的测试，这次速度较块，基本半小时就写完了，附带一下代码。

from machine import Pin, I2C

# construct an I2C bus
# i2c = I2C(scl=Pin(22), sda=Pin(21), freq=100000)

# while True:
# 	print(i2c.scan())

import sys
import utime
from machine import Pin
from machine import I2C

class SHT3x_Sensor:

	def __init__(self, freq, sdapin, sclpin):
		self.i2c = I2C(freq=freq, sda=Pin(sdapin), scl=Pin(sclpin)) 
		addrs = self.i2c.scan()
		if not addrs:
			raise Exception('no SHT3X found at bus on SDA pin %d SCL pin %d' % (sdapin, sclpin))
		self.addr = addrs.pop()	

	def read_temp_humd(self):
		status = self.i2c.writeto(self.addr,b'x24x00')
		# delay (20 slow)
		utime.sleep(1)
		# read 6 bytes
		databytes = self.i2c.readfrom(self.addr, 6)
		dataset = [databytes[0],databytes[1]]
		dataset = [databytes[3],databytes[4]]
		temperature_raw = databytes[0] << 8 | databytes[1]
		temperature = (175.0 * float(temperature_raw) / 65535.0) - 45
		# fahreheit
		# temperature = (315.0 * float(temperature_raw) / 65535.0) - 49
		humidity_raw = databytes[3] << 8  | databytes[4]
		humidity = (100.0 * float(humidity_raw) / 65535.0)
		sensor_data = [temperature, humidity]
		return sensor_data

import time

class SHT25:
	i2c = []
	ADDR = 64
	
	CMD_READ_TEMPERATURE = 0xF3
	CMD_READ_HUMIDITY    = 0xF5
	CMD_READ_REGISTER    = 0xE7
	CMD_WRITE_REGISTER   = 0xE6
	CMD_RESET 			 = 0xFE

	def __init__(self, _i2c):
		self.i2c = _i2c

	def toTemperature(self, buf):
		return -46.85 + 175.72 * ((buf[0] << 8) + buf[1]) /2**16

	def toHumidity(self, buf):
		return -6 + 125.0 * ((buf[0] << 8) + buf[1]) / 2**16

	def decodeUserReg(self, buf):
		reg = buf[0]
		ret = []
		if(0b10000001 & reg == 0b10000001):
			ret.append("11bits")
		elif(0b10000001 & reg == 0b10000000):
			ret.append("RH 10bit T 13bit")
		elif(0b10000001 & reg == 0b00000001):
			ret.append("RH 8bit T 12bit")
		elif(0b10000001 & reg == 0b00000000):
			ret.append("RH 12bit T 14bit")
		
		if(0b01000000 & reg == 0b01000000):
			ret.append("VDD < 2.5")
		else:
			ret.append("VDD > 2.5")

		if(0b00000100 & reg == 0b00000100):
			ret.append("heater ON")
		else:
			ret.append("heater OFF")

		if(0b00000010 & reg == 0b00000010):
			ret.append("OTP reload disabled")
		else:
			ret.append("OTP reload enabled")

		return ret

	def runI2CCommand(self, command, bytesToRead):
		b = bytearray(1)
		b[0] = command

		self.i2c.writeto(self.ADDR, b)

		if(bytesToRead > 0):
			recv = bytearray(bytesToRead)
			retryCounter = 0
			done = False
			while retryCounter < 15 and not done:
				try:
					self.i2c.readfrom_into(self.ADDR, recv)
					done = True
					retryCounter = retryCounter + 1				
				except:
					time.sleep(0.01)
			return recv

	def getTemperature(self):
		return self.toTemperature(self.runI2CCommand(self.CMD_READ_TEMPERATURE, 3))

	def getHumidity(self):
		return self.toHumidity(self.runI2CCommand(self.CMD_READ_HUMIDITY, 3))
	
	def getUserRegister(self):
		return self.decodeUserReg(self.runI2CCommand(self.CMD_READ_REGISTER, 1))

	def setUserRegister(self, register):
		b = bytearray(2)
		b[0] = self.CMD_WRITE_REGISTER
		b[1] = register & 0b11000111
		self.i2c.writeto(self.ADDR, b)

	def reset(self):
		self.runI2CCommand(self.CMD_RESET, 0)

while True:

  try:
    i2c = I2C(scl=Pin(22), sda=Pin(21), freq=100000)
    addrs = i2c.scan()
    if not addrs:
        raise Exception('no SHT2x found at bus on SDA pin %d SCL pin %d' % (21, 22))
    sensor = SHT25(i2c)
    print("SHT2x Temperature : " + str(sensor.getTemperature()) + ", Humidity : " + str(sensor.getHumidity()))
  except Exception as e:
    print("SHT2x:", e)

  try:
    sht3x_sensor = SHT3x_Sensor(freq=100000, sdapin=25, sclpin=26)
    measure_data = sht3x_sensor.read_temp_humd()
    print("SHT3x Temperature : ", measure_data[0], ", Humidity : ", measure_data[1])
  except Exception as e:
    print("SHT3x:", e)
    
  time.sleep(1)