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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

libraries/DFRobot_DHT20/python/raspberrypi/README.md

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+# DFRobot_DHT20
+The DHT20 temperature & humidity sensor is the newly upgraded version of the DHT11. The DHT20 features a brand-new ASIC dedicated chip, an improved MEMS semiconductor capacitive humidity sensor element and a standard on-chip temperature element. All sensors are factory calibrated and characterized by low power, high precision & stability, fast response, and strong anti-interference. Moreover, the DHT20 performance parameters of accuracy, power supply voltage, measurement range and response time have been enhanced greatly over the previous generation,making it more cost-effective. Besides that, the DHT20 temperature & humidity sensor employs I2C digital output protocol, which is very suitable for HVAC,automobiles, data loggers, weather stations, home appliances, and other related temperature and humidity detection and controlled areas. <br>
+
+![正反面svg效果图](https://github.com/cdjq/DFRobot_LIS2DW12/raw/master/resources/images/SEN0245svg4.png)
+
+## 产品链接（链接到英文商城）
+    SKU：产品名称
+## Table of Contents
+
+* [Summary](#summary)
+* [Installation](#installation)
+* [Methods](#methods)
+* [Compatibility](#compatibility)
+* [History](#history)
+* [Credits](#credits)
+
+## Summary
+
+Provide an RaspberryPi library to get Humidity and Temperature by reading data from dht20.
+## Installation
+
+Download the DFRobot_DHT20 file to the Raspberry Pi file directory, then run the following command line to use this sensor:
+
+## Methods
+```python
+  '''
+    @brief init function
+    @return Return 0 if initialization succeeds, otherwise return non-zero and error code.
+   '''
+  def begin(self ):
+
+  '''
+    @brief Get ambient temperature, unit: °C
+    @return ambient temperature, its measurement range is (-40°C ~ 80°C)
+  '''
+  def get_temperature(self):
+     
+  '''
+    @brief Get relative humidity, unit: %RH. 
+    @return relative humidity, its measurement range is (1-100%)
+  '''
+  def get_humidity(self):
+```
+
+## Compatibility
+
+MCU                | Work Well    | Work Wrong   | Untested    | Remarks
+------------------ | :----------: | :----------: | :---------: | -----
+Raspberry Pi              |      √         |            |             | 
+
+
+## History
+
+- Date 2021-7-2
+- Version V0.1
+
+
+## Credits
+
+Written by fengli(li.feng@dfrobot.com), 2021.7.2 (Welcome to our [website](https://www.dfrobot.com/))
+
+
+
+
+

libraries/DFRobot_DHT20/python/raspberrypi/examples/get_data.py

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+# -*- coding:utf-8 -*-
+"""
+  *@file get_data.ino
+  *@brief Read ambient temperature and relative humidity and print them to serial port.
+  *@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  2020-12-02
+  *@get from https://www.dfrobot.com
+  *@https://github.com/DFRobot/DFRobot_DHT20
+"""
+import sys
+import time
+sys.path.append("../")
+from DFRobot_DHT20 import *
+
+IIC_MODE         = 0x01            # default use IIC1
+IIC_ADDRESS      = 0x38           # default i2c device address
+'''
+   # The first  parameter is to select iic0 or iic1
+   # The second parameter is the iic device address
+'''
+dht20 = DFRobot_DHT20(IIC_MODE ,IIC_ADDRESS)
+"""
+     @brief Initialize function
+"""
+dht20.begin()
+
+while True:
+  #Read ambient temperature and relative humidity and print them to terminal
+  print("temperature::%f C"%dht20.get_temperature())
+  print("humidity::%f RH"%dht20.get_humidity())
+  time.sleep(1)