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libraries/DFRobot_DHT20/python/raspberrypi/DFRobot_DHT20.py

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+# -*- coding: utf-8 -*
+"""
+  *@file DFRobot_DHT20.py
+  *@brief Define the basic structure of class DFRobot_DHT20
+  *@copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
+  *@licence     The MIT License (MIT)
+  *@author [fengli](li.feng@dfrobot.com)
+  *@version  V1.0
+  *@date  2021-6-25
+  *@get from https://www.dfrobot.com
+  *@https://github.com/DFRobot/DFRobot_DHT20
+"""
+import serial
+import time
+import smbus
+                
+class DFRobot_DHT20(object):
+  ''' Conversion data '''
+
+  _addr      =  0x50
+
+  def __init__(self ,bus,address):
+    self.i2cbus = smbus.SMBus(bus)
+    self._addr = address
+    self.idle =    0
+
+  '''
+    @brief init function
+    @return Return 0 if initialization succeeds, otherwise return non-zero and error code.
+   '''
+  def begin(self ):
+
+    #self.i2cbus.write_byte(self._addr,0xaa)
+    time.sleep(0.5)
+    data = self.read_reg(0x71,1)
+    
+    if (data[0] | 0x08) == 0:
+      return False
+    else:
+      return True
+
+  '''
+    @brief Get ambient temperature, unit: °C
+    @return ambient temperature,the measurement range is -40°C ~ 80°C
+  '''
+  def get_temperature(self):
+     self.write_reg(0xac,[0x33,0x00])
+     time.sleep(0.1)
+     data = self.read_reg(0x71,7)
+     rawData = ((data[3]&0xf) <<16) + (data[4]<<8)+data[5]
+     #print(rawData)
+     temperature = float(rawData)/5242 -50
+     return temperature
+     
+  '''
+    @brief Get relative humidity, unit: %RH. 
+    @return relative humidity, the measurement range is (1-100%)
+  '''
+  def get_humidity(self):
+     self.write_reg(0xac,[0x33,0x00])
+     time.sleep(0.1)
+     data = self.read_reg(0x71,7)
+     rawData = ((data[3]&0xf0) >>4) + (data[1]<<12)+(data[2]<<4)
+     humidity = float(rawData)/0x100000
+     return humidity*100
+     
+  
+  def write_reg(self, reg,data):
+    time.sleep(0.01)
+    self.i2cbus.write_i2c_block_data(self._addr,reg,data)
+  
+  
+  def read_reg(self,reg,len):
+    time.sleep(0.01)
+    rslt = self.i2cbus.read_i2c_block_data(self._addr,reg,len)
+    #print(rslt)
+    return rslt