diff --git a/sbapp/sideband/sense.py b/sbapp/sideband/sense.py
new file mode 100644
index 0000000..285b416
--- /dev/null
+++ b/sbapp/sideband/sense.py
@@ -0,0 +1,194 @@
+import RNS
+import time
+
+from RNS.vendor import umsgpack as umsgpack
+
+class Sensor():
+  SID_NONE      = 0x00
+  SID_BATTERY   = 0x01
+  SID_BAROMETER = 0x02
+
+  def __init__(self, sid = None, stale_time = None):
+    self._sid = sid or Sensor.SID_NONE
+    self._stale_time = stale_time
+    self._data = None
+    self.active = False
+    self.last_update = 0
+    self.last_read = 0
+
+  @property
+  def sid(self):
+    return self._sid
+
+  @property
+  def data(self):
+    if self._data == None or (self._stale_time != None and time.time() > self.last_update+self._stale_time):
+      try:
+        self.update_data()
+      except:
+        pass
+
+    self.last_read = time.time()
+    return self._data
+
+  @data.setter
+  def data(self, value):
+    self.last_update = time.time()
+    self._data = value
+
+  def update_data(self):
+    raise NotImplementedError()
+
+  def setup_sensor(self):
+    raise NotImplementedError()
+
+  def teardown_sensor(self):
+    raise NotImplementedError()
+
+  def start(self):
+    self.setup_sensor()
+    self.active = True
+
+  def stop(self):
+    self.teardown_sensor()
+    self.active = False
+
+  def packb(self):
+    return umsgpack.packb(self.pack())
+
+  def unpackb(self, packed):
+    return umsgpack.unpackb(self.unpack(packed))
+
+  def pack(self):
+    return self.data
+
+  def unpack(self, packed):
+    return packed
+
+class Battery(Sensor):
+  SID = Sensor.SID_BATTERY
+  STALE_TIME = 10
+
+  def __init__(self):
+    super().__init__(type(self).SID, type(self).STALE_TIME)
+
+    if RNS.vendor.platformutils.is_android() or RNS.vendor.platformutils.is_linux():
+      from plyer import battery
+      self.battery = battery
+
+  def setup_sensor(self):
+    if RNS.vendor.platformutils.is_android() or RNS.vendor.platformutils.is_linux():
+      self.update_data()
+
+  def teardown_sensor(self):
+    if RNS.vendor.platformutils.is_android() or RNS.vendor.platformutils.is_linux():
+      self.data = None
+
+  def update_data(self):
+    try:
+      if RNS.vendor.platformutils.is_android() or RNS.vendor.platformutils.is_linux():
+        self.battery.get_state()
+        b = self.battery.status
+        self.data = {"charge_percent": b["percentage"], "charging": b["isCharging"]}
+    
+    except:
+      self.data = None
+
+  def pack(self):
+    d = self.data
+    if d == None:
+      return None
+    else:
+      return [d["charge_percent"], d["charging"]]
+
+  def unpack(self, packed):
+    try:
+      if packed == None:
+        return None
+      else:
+        return {"charge_percent": packed[0], "charging": packed[1]}
+    except:
+      return None
+
+class Barometer(Sensor):
+  SID = Sensor.SID_BAROMETER
+  STALE_TIME = 5
+
+  def __init__(self):
+    super().__init__(type(self).SID, type(self).STALE_TIME)
+
+    if RNS.vendor.platformutils.is_android():
+      from plyer import barometer
+      self.android_barometer = barometer
+
+  def setup_sensor(self):
+    if RNS.vendor.platformutils.is_android():
+      self.android_barometer.enable()
+      self.update_data()
+
+  def teardown_sensor(self):
+    if RNS.vendor.platformutils.is_android():
+      self.android_barometer.disable()
+      self.data = None
+
+  def update_data(self):
+    try:
+      if RNS.vendor.platformutils.is_android():
+        self.data = {"mbar": self.android_barometer.pressure}
+    
+    except:
+      self.data = None
+
+  def pack(self):
+    d = self.data
+    if d == None:
+      return None
+    else:
+      return d["mbar"]
+
+  def unpack(self, packed):
+    try:
+      if packed == None:
+        return None
+      else:
+        return {"mbar": packed}
+    except:
+      return None
+
+class Telemeter():
+  def __init__(self):
+    self.available = {"battery": Battery, "barometer": Barometer}
+    self.sensors = {}
+
+  def enable(self, sensor):
+    if sensor in self.available:
+      if not sensor in self.sensors:
+        self.sensors[sensor] = self.available[sensor]()
+      if not self.sensors[sensor].active:
+        self.sensors[sensor].start()
+  
+  def disable(self, sensor):
+    if sensor in self.available:
+      if sensor in self.sensors:
+        if self.sensors[sensor].active:
+          self.sensors[sensor].stop()
+
+  def read(self, sensor):
+    if sensor in self.available:
+      if sensor in self.sensors:
+        return self.sensors[sensor].data
+    return None
+
+  def read_all(self):
+    readings = {}
+    for sensor in self.sensors:
+      if self.sensors[sensor].active:
+        readings[sensor] = self.sensors[sensor].data
+    return readings
+
+  def pack(self):
+    packed = {}
+    for sensor in self.sensors:
+      if self.sensors[sensor].active:
+        packed[self.sensors[sensor].sid] = self.sensors[sensor].pack()
+    return umsgpack.packb(packed)
\ No newline at end of file