add temper&humidity sensor

I2C/dht20.py

+from machine import I2C
+from time import sleep_ms
+class DHT20(object):
+    def __init__(self, i2c):
+        self.i2c = i2c
+        if (self.dht20_read_status() & 0x80) == 0x80:
+            self.dht20_init()  
+            
+    def read_dht20(self):
+        self.i2c.writeto(0x38, bytes([0xac,0x33,0x00]))
+        sleep_ms(80)
+        cnt = 0
+        while (self.dht20_read_status() & 0x80) == 0x80:
+            sleep_ms(1)
+            if cnt >= 100:
+                cnt += 1
+                break
+        data = self.i2c.readfrom(0x38, 7, True)
+        n = []
+        for i in data[:]:
+            n.append(i)
+        return n
+        
+    def dht20_read_status(self):
+        data = self.i2c.readfrom(0x38, 1, True)
+        return data[0]
+    
+    def dht20_init(self):
+        i2c.writeto(0x38, bytes([0xa8,0x00,0x00]))
+        sleep_ms(10)
+        i2c.writeto(0x38, bytes([0xbe,0x08,0x00]))
+        
+    def calc_crc8(self,data):
+        crc = 0xff
+        for i in data[:-1]:
+            crc ^= i
+            for j in range(8):
+                if crc & 0x80:
+                    crc = (crc << 1) ^ 0x31
+                else:
+                    crc = (crc << 1)
+        return crc
+    
+    def dht20_temperature(self):
+        data = self.read_dht20()
+        Temper = 0
+        if 1:
+            Temper = (Temper | data[3]) << 8
+            Temper = (Temper | data[4]) << 8
+            Temper = Temper | data[5]
+            Temper = Temper & 0xfffff
+            Temper = (Temper * 200 * 10 / 1024 / 1024 - 500)/10
+        return Temper
+    def dht20_humidity(self):
+        
+        data = self.read_dht20()
+        humidity = 0
+        if 1:
+            humidity = (humidity | data[1]) << 8
+            humidity = (humidity | data[2]) << 8
+            humidity = humidity | data[3]
+            humidity = humidity >> 4
+            humidity = (humidity * 100 * 10 / 1024 / 1024)/10
+        return humidity
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