From 09a849903c33bd441b08b11eb97fe16f2c57e592 Mon Sep 17 00:00:00 2001
From: Dirk Alders <dirk@mount-mockery.de>
Date: Fri, 4 Sep 2020 12:25:02 +0200
Subject: [PATCH] Initial envsens definitions

---
 __init__.py | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 __init__.py

diff --git a/__init__.py b/__init__.py
new file mode 100644
index 0000000..9d8bddc
--- /dev/null
+++ b/__init__.py
@@ -0,0 +1,40 @@
+from config import dht_gpio
+try:
+    import Adafruit_DHT as dht
+except ImportError:
+    dht = None
+
+try:
+    import Adafruit_BMP.BMP085 as bmp
+except ImportError:
+    bmp = None
+
+#TODO: background process for value sensing (every x seconds)
+
+KEY_TEMPERATURE = 't'
+KEY_HUMIDITY = 'h'
+KEY_PRESSURE = 'p'
+
+
+class EnvSens(object):
+    def __init__(self):
+        if bmp is not None:
+            self.bmp = bmp.BMP085()
+
+    def get_env_data(self):
+        #
+        # DHT22
+        #
+        if dht is None:
+            h = -17.3
+            t = -125.7
+        else:
+            h, t = dht.read_retry(dht.DHT22, dht_gpio)
+        #
+        # BMP180
+        #
+        if bmp is None:
+            p = -1024.17
+        else:
+            p = self.bmp.read_pressure()/100.
+        return {KEY_TEMPERATURE: t, KEY_HUMIDITY: h, KEY_PRESSURE: p}