diff --git a/drivers/dht/dht.py b/drivers/dht/dht.py new file mode 100644 index 0000000000..9a69e7e07e --- /dev/null +++ b/drivers/dht/dht.py @@ -0,0 +1,32 @@ +# DHT11/DHT22 driver for MicroPython on ESP8266 +# MIT license; Copyright (c) 2016 Damien P. George + +import esp + +class DHTBase: + def __init__(self, pin): + self.pin = pin + self.buf = bytearray(5) + + def measure(self): + buf = self.buf + esp.dht_readinto(self.pin, buf) + if (buf[0] + buf[1] + buf[2] + buf[3]) & 0xff != buf[4]: + raise Exception("checksum error") + +class DHT11(DHTBase): + def humidity(self): + return self.buf[0] + + def temperature(self): + return self.buf[2] + +class DHT22(DHTBase): + def humidity(self): + return (self.buf[0] << 8 | self.buf[1]) * 0.1 + + def temperature(self): + t = ((self.buf[2] & 0x7f) << 8 | self.buf[3]) * 0.1 + if self.buf[2] & 0x80: + t = -t + return t diff --git a/ports/esp32/modules/dht.py b/ports/esp32/modules/dht.py index b6acf2853e..2aa2f5cbfe 120000 --- a/ports/esp32/modules/dht.py +++ b/ports/esp32/modules/dht.py @@ -1 +1 @@ -../../esp8266/modules/dht.py \ No newline at end of file +../../../drivers/dht/dht.py \ No newline at end of file diff --git a/ports/esp8266/modules/dht.py b/ports/esp8266/modules/dht.py deleted file mode 100644 index 9a69e7e07e..0000000000 --- a/ports/esp8266/modules/dht.py +++ /dev/null @@ -1,32 +0,0 @@ -# DHT11/DHT22 driver for MicroPython on ESP8266 -# MIT license; Copyright (c) 2016 Damien P. George - -import esp - -class DHTBase: - def __init__(self, pin): - self.pin = pin - self.buf = bytearray(5) - - def measure(self): - buf = self.buf - esp.dht_readinto(self.pin, buf) - if (buf[0] + buf[1] + buf[2] + buf[3]) & 0xff != buf[4]: - raise Exception("checksum error") - -class DHT11(DHTBase): - def humidity(self): - return self.buf[0] - - def temperature(self): - return self.buf[2] - -class DHT22(DHTBase): - def humidity(self): - return (self.buf[0] << 8 | self.buf[1]) * 0.1 - - def temperature(self): - t = ((self.buf[2] & 0x7f) << 8 | self.buf[3]) * 0.1 - if self.buf[2] & 0x80: - t = -t - return t diff --git a/ports/esp8266/modules/dht.py b/ports/esp8266/modules/dht.py new file mode 120000 index 0000000000..2aa2f5cbfe --- /dev/null +++ b/ports/esp8266/modules/dht.py @@ -0,0 +1 @@ +../../../drivers/dht/dht.py \ No newline at end of file