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+#  AHT20
+
+用于AHT20和AHT10温度和湿度传感器的MicroPython驱动程序。
+
+
+
+## 案例展示
+
+  读取温湿度数据, 并判断温度与湿度的高低情况，将其输出在屏幕上
+
+![1.jpg](/aht20/img/1.jpg)
+
+## 物理连接
+
+ SCL --> G01
+ SDA --> G00
+ VCC --> 3V3
+ GND --> GND
+
+### 传感器选择
+
+   传感器选择如下图所示的型号为aht20的温湿度传感器模块
+
+![2.jpg](/aht20/img/2.jpg)
+
+### 
+
+## 传感器库使用
+
+  可以获取[ahtx0.py](https://gitee.com/blackwalnutlabs/waffle-nano-v1-sensor-lib/blob/master//aht20/code/ahtx0.py),将此库通过[Waffle Maker](https://wafflenano.blackwalnut.tech/ide/index.html#/editor) 的文件上传功能将此库上传到`Waffle Nano`
+
+  我们在可以在主函数中使用以下代码导入此库
+
+```python
+import ahtx0
+```
+
+  在对象构造函数中，我们需要传入三个引脚数字，分别是ADC引脚，以及两个可设置模式为输入的引脚
+
+```python
+heartSensor = AD8232(analogPin = 5, LO1Pin = 2, LO2Pin = 14) #构造心电传感器对象
+```
+
+  使用心电传感器对象的`read()`方法读取出整型数据
+
+```
+x=int(sensor.temperature*100) x=int(sensor.relative_humidity*100) #从心电传感器中获取数据
+```
+
+​		关于此库相关细节说明详见代码注释
+
+# 样例代码
+
+import utime
+from machine import Pin, I2C
+
+import ahtx0
+i2c = I2C(1, sda=Pin(0), scl=Pin(1), freq=100000)
+
+#使用I2C创建传感器对象
+
+sensor = ahtx0.AHT20(i2c)
+
+while True:
+    print("\nTemperature: %0.2f C" % sensor.temperature)
+    print("Humidity: %0.2f %%" % sensor.relative_humidity)
+    utime.sleep(5)
+
+# 使用I2C创建传感器对象
+sensor = ahtx0.AHT20(i2c)
+
+while True:
+    print("\nTemperature: %0.2f C" % sensor.temperature)
+    print("Humidity: %0.2f %%" % sensor.relative_humidity)
+    utime.sleep(5)
+
+## 案例代码复现
+
+  可以获取[main.py](https://gitee.com/blackwalnutlabs/waffle-nano-v1-sensor-lib/blob/master/aht20/code/main.py)函数，将其内容复制到[Waffle Maker](https://wafflenano.blackwalnut.tech/ide/index.html#/editor) 编辑器上传输给`Waffle Nano`，以复现此案例。
+
+  案例相关细节说明详见代码注释
+
diff --git a/aht20/code/ahtx0.py b/aht20/code/ahtx0.py
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+++ b/aht20/code/ahtx0.py
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+# The MIT License (MIT)
+#
+# Copyright (c) 2020 Kattni Rembor for Adafruit Industries
+# Copyright (c) 2020 Andreas Bühl
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+"""
+
+MicroPython driver for the AHT10 and AHT20 Humidity and Temperature Sensor
+
+Author(s): Andreas Bühl, Kattni Rembor
+
+"""
+
+import utime
+from micropython import const
+
+
+class AHT20:
+    """Interface library for AHT10/AHT20 temperature+humidity sensors"""
+
+    AHTX0_I2CADDR_DEFAULT = const(0x38)  # Default I2C address
+    AHTX0_CMD_INITIALIZE = 0xBE  # Initialization command
+    AHTX0_CMD_TRIGGER = const(0xAC)  # Trigger reading command
+    AHTX0_CMD_SOFTRESET = const(0xBA)  # Soft reset command
+    AHTX0_STATUS_BUSY = const(0x80)  # Status bit for busy
+    AHTX0_STATUS_CALIBRATED = const(0x08)  # Status bit for calibrated
+
+    def __init__(self, i2c, address=AHTX0_I2CADDR_DEFAULT):
+        utime.sleep_ms(20)  # 20ms delay to wake up
+        self._i2c = i2c
+        self._address = address
+        self._buf = bytearray(6)
+        self.reset()
+        if not self.initialize():
+            raise RuntimeError("Could not initialize")
+        self._temp = None
+        self._humidity = None
+
+    def reset(self):
+        """Perform a soft-reset of the AHT"""
+        self._buf[0] = self.AHTX0_CMD_SOFTRESET
+        self._i2c.write(self._address, self._buf[0:1])
+        utime.sleep_ms(20)  # 20ms delay to wake up
+
+    def initialize(self):
+        """Ask the sensor to self-initialize. Returns True on success, False otherwise"""
+        # self._buf[0] = self.AHTX0_CMD_INITIALIZE
+        # self._buf[1] = 0x08
+        # self._buf[2] = 0x00
+        # self._i2c.write(self._address, self._buf[0:3])
+        # self._wait_for_idle()
+        # if not self.status & self.AHTX0_STATUS_CALIBRATED:
+        #     return False
+        return True
+
+    @property
+    def status(self):
+        """The status byte initially returned from the sensor, see datasheet for details"""
+        self._read_to_buffer()
+        # print("status: "+hex(self._buf[0]))
+        return self._buf[0]
+
+    @property
+    def relative_humidity(self):
+        """The measured relative humidity in percent."""
+        self._perform_measurement()
+        self._humidity = (self._buf[1] << 12) | (self._buf[2] << 4) | (self._buf[3] >> 4)
+        self._humidity = (self._humidity * 100) / 0x100000
+        return self._humidity
+
+    @property
+    def temperature(self):
+        """The measured temperature in degrees Celcius."""
+        self._perform_measurement()
+        self._temp = ((self._buf[3] & 0xF) << 16) | (self._buf[4] << 8) | self._buf[5]
+        self._temp = ((self._temp * 200.0) / 0x100000) - 50
+        return self._temp
+
+    def _read_to_buffer(self):
+        self._buf = self._i2c.read(self._address, 6)
+        # self._i2c.readfrom_into(self._address, self._buf)
+    
+    def _trigger_measurement(self):
+        """Internal function for triggering the AHT to read temp/humidity"""
+        # self._buf[0] = self.AHTX0_CMD_TRIGGER
+        # self._buf[1] = 0x33
+        # self._buf[2] = 0x00
+        # self._i2c.write(self._address, self._buf[0:3])
+        self._i2c.write(self._address, b'\xAC\x33\x00')
+
+    def _wait_for_idle(self):
+        while self.status & self.AHTX0_STATUS_BUSY:
+            utime.sleep_ms(5)
+
+    def _perform_measurement(self):
+        self._trigger_measurement()
+        self._wait_for_idle()
+        self._read_to_buffer()
+
+
diff --git a/aht20/code/main.py b/aht20/code/main.py
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index 0000000000000000000000000000000000000000..d6761438ed91908c7e6e7d9ed18ff661d126c84a
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+++ b/aht20/code/main.py
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+from machine import I2C, Pin, SPI
+import utime
+import ahtx0
+import st7789
+import ujson
+import urandom
+
+spi = SPI(0, baudrate=40000000, polarity=1, phase=0, bits=8, endia=0, sck=Pin(6), mosi=Pin(8))
+display = st7789.ST7789(spi, 240, 240, reset=Pin(11,func=Pin.GPIO, dir=Pin.OUT), dc=Pin(7,func=Pin.GPIO, dir=Pin.OUT))
+
+display.init()
+utime.sleep(4)
+display.fill(st7789.color565(255, 255, 255))
+display.pixel(5, 5, st7789.color565(255, 0, 0))
+display.draw_string(15, 55, "Welcome to use ",size=3,color=st7789.color565(0, 0, 0))
+display.draw_string(5, 85, "the temperature",size=3,color=st7789.color565(0, 0, 0))
+display.draw_string(30, 115, "and humidity",size=3,color=st7789.color565(0, 0, 0))
+display.draw_string(60, 145, "detector",size=3,color=st7789.color565(0, 0, 0))
+utime.sleep(4)
+
+i2c=I2C(1,sda=Pin(0),scl=Pin(1),freq=100000)
+print(i2c.scan())
+sensor = ahtx0.AHT20(i2c)
+
+while True:
+    
+    x=int(sensor.temperature*100)
+    a=int(x/100)
+    b=int(x%100)
+    temp=float(x*1.0/100)
+    print(temp)
+
+    
+    display.fill(st7789.color565(255, 255, 255))
+    display.pixel(5, 5, st7789.color565(255, 0, 0))
+    if(temp<-40):
+        display.draw_string(1, 10, "Error",size=3,color=st7789.color565(0, 0, 0))
+        display.draw_string(1, 40, "Check the connection",size=2,color=st7789.color565(0, 0, 0))
+    elif(temp<0):
+        b=100-b
+        display.draw_string(20, 10, "Temperature:",size=3,color=st7789.color565(0, 0, 0))
+        display.draw_string(30, 40, "  "+str(a)+"."+str(b)+" C",size=3,color=st7789.color565(0, 0, 0))
+    else:
+        display.draw_string(20, 10, "Temperature:",size=3,color=st7789.color565(0, 0, 0))
+        display.draw_string(30, 40, "  "+str(a)+"."+str(b)+" C",size=3,color=st7789.color565(0, 0, 0))
+    
+    if(temp<12 and temp>=-40):
+        display.draw_string(1, 70, "You need to make the te-",size=2,color=st7789.color565(0, 0, 0))
+        display.draw_string(20, 90, "mperature higher.",size=2,color=st7789.color565(0, 0, 0))
+    elif(temp>45):
+        display.draw_string(1, 70, "You need to get the tem-",size=2,color=st7789.color565(0, 0, 0))
+        display.draw_string(40, 90, "perature down.",size=2,color=st7789.color565(0, 0, 0))
+    elif(temp>=12 and temp<=45):
+        display.draw_string(5, 70, "The temperature at the ",size=2,color=st7789.color565(0, 0, 0))
+        display.draw_string(45, 90, "right moment.",size=2,color=st7789.color565(0, 0, 0))
+
+
+    x=int(sensor.relative_humidity*100)
+    a=int(x/100)
+    b=int(x%100)
+    humi=float(x*1.0/100)
+    print(humi)
+    
+    if(humi>80 or humi<0):
+        display.draw_string(1, 120, "Error",size=3,color=st7789.color565(0, 0, 0))
+        display.draw_string(1, 150, "Check the connection",size=2,color=st7789.color565(0, 0, 0))
+    elif(humi<=80 and humi>=0):
+        display.draw_string(45, 120, "Humidity:",size=3,color=st7789.color565(0, 0, 0))
+        display.draw_string(30, 150, "  "+str(a)+"."+str(b)+" %",size=3,color=st7789.color565(0, 0, 0))
+    
+    if(humi<50):
+        display.draw_string(1, 180, "You need to make the hu-",size=2,color=st7789.color565(0, 0, 0))
+        display.draw_string(50, 200, "midity higher.",size=2,color=st7789.color565(0, 0, 0))
+    elif(humi>90):
+        display.draw_string(1, 180, "You need to get the hum-",size=2,color=st7789.color565(0, 0, 0))
+        display.draw_string(40, 200, "idity down.",size=2,color=st7789.color565(0, 0, 0))
+    elif(humi>=50 and humi<=90):
+        display.draw_string(20, 180, "The humidity at the ",size=2,color=st7789.color565(0, 0, 0))
+        display.draw_string(45, 200, "right moment.",size=2,color=st7789.color565(0, 0, 0))
+
+
+    utime.sleep(4)
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