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Author: sshahryiar

Weather Station (AHT15 + SPL06-007)/AHT15.py

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+from micropython import const
+from utime import sleep_ms
+
+
+AHT15_I2C_Address = const(0x38)
+
+AHT15_INIT_CMD = const(0xE1)
+AHT15_TRIGGER_MEASURMENT_CMD = const(0xAC)
+AHT15_SOFT_RESET_CMD = const(0xBA)
+
+AHT15_INIT_CAL_ENABLE = const(0x08)
+AHT15_DATA_MEASURMENT_CMD = const(0x33)
+AHT15_DATA_NOP = const(0x00)
+
+
+class AHT15():
+    
+    def __init__(self, _i2c):
+        self.i2c = _i2c
+        self.i2c_address = AHT15_I2C_Address
+        
+        self.buf = bytearray(0x07)
+        for i in range(0, 7):
+            self.buf[i] = 0x00
+        
+        self.init()
+        
+    
+    def init(self):
+        self.soft_reset()
+        self.calibrate()
+        sleep_ms(200)
+        
+        
+    def write_bytes(self, cmd_1, cmd_2):
+        self.buf[0] = cmd_1
+        self.buf[1] = cmd_2
+        self.buf[2] = AHT15_DATA_NOP
+        
+        self.i2c.writeto(self.i2c_address, self.buf[0:3])
+
+
+    def read_sensor(self):
+        t = 0
+        rh = 0
+        crc = 0
+        status = 0
+        self.write_bytes(AHT15_TRIGGER_MEASURMENT_CMD, AHT15_DATA_MEASURMENT_CMD)
+        sleep_ms(10)
+        value = self.i2c.readfrom_into(self.i2c_address, self.buf, 0x07)
+        
+        status = self.buf[0]
+        rh = ((self.buf[1] << 12) | (self.buf[2] << 4) | (self.buf[3] >> 4))
+        t = (((self.buf[3] & 0x0F) << 16) | (self.buf[4] << 8) | (self.buf[5]))
+        crc = self.buf[6]
+        
+        rh = ((rh * 100.0) / 0x100000)
+        t = (((t * 200.0) / 0x100000) - 50.0)
+        
+        return rh, t, status, crc
+    
+    
+    def calibrate(self):
+        self.write_bytes(AHT15_INIT_CMD, AHT15_INIT_CAL_ENABLE)
+        sleep_ms(600)
+        
+        
+    def soft_reset(self):
+        self.buf[0] = AHT15_SOFT_RESET_CMD
+        self.i2c.writeto(self.i2c_address, self.buf[0:1])
+        sleep_ms(200)