From a40ce1d829eca6fe0fad0b7f4478a6651903dd2a Mon Sep 17 00:00:00 2001
From: Damien George
Date: Wed, 31 Jan 2018 18:11:06 +1100
Subject: esp8266/modules: Move dht.py driver to drivers/dht directory.

---
 drivers/dht/dht.py | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 drivers/dht/dht.py

(limited to 'drivers')

diff --git a/drivers/dht/dht.py b/drivers/dht/dht.py
new file mode 100644
index 000000000..9a69e7e07
--- /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
-- 
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