diff --git a/actuators.py b/actuators.py
index 5dd3aab..55cbada 100644
--- a/actuators.py
+++ b/actuators.py
@@ -53,4 +53,6 @@ class MockPIN(Actuator):
 
 actuators = {
     'heater': (GPIOPin if rpi else MockPIN)(pin=22, initial=GPIO.HIGH, onstate=GPIO.LOW, offstate=GPIO.HIGH),
+    'fan': (GPIOPin if rpi else MockPIN)(pin=27, initial=GPIO.HIGH, onstate=GPIO.LOW, offstate=GPIO.HIGH),
+    'humidifier': (GPIOPin if rpi else MockPIN)(pin=17, initial=GPIO.HIGH, onstate=GPIO.LOW, offstate=GPIO.HIGH),
 }
diff --git a/sensors.py b/sensors.py
index eed1b43..d567ce9 100644
--- a/sensors.py
+++ b/sensors.py
@@ -7,6 +7,10 @@ from os.path import exists
 import RPi.GPIO as GPIO
 GPIO.setmode(GPIO.BCM)
 
+# SHT40
+import board
+import adafruit_sht4x
+
 # TODO client: add a way to disable live plotting? server: stop
 # sending data periodically to everybody!
 
@@ -63,6 +67,28 @@ class Temperature1W(Sensor):
             return (time, None)
         return (time, int(re.search("t=([0-9]+)", content[1]).group(1)) / 1000.0)
 
+class SHT40(Sensor):
+    def __init__(self, what):
+        self.measure = what
+        self.i2c = board.I2C()  # uses board.SCL and board.SDA
+        self.sht = adafruit_sht4x.SHT4x(i2c)
+        print('Serial: ', hex(self.sht.serial_number))
+        # FIXME:
+        self.sht.mode = adafruit_sht4x.Mode.NOHEAT_HIGHPRECISION
+        # Can also set the mode to enable heater
+        # sht.mode = adafruit_sht4x.Mode.LOWHEAT_100MS
+        # modes = [adafruit_sht4x.Mode.HIGHHEAT_1S,
+        #          adafruit_sht4x.Mode.LOWHEAT_100MS,
+        #          adafruit_sht4x.Mode.NOHEAT_HIGHPRECISION]
+
+    def read(self):
+        time = perf_counter()
+        temperature, relative_humidity = sht.measurements
+        # print("Temperature: %0.1f C" % temperature)
+        # print("Humidity: %0.1f %%" % (relative_humidity))
+        # print("")
+        return (time, temerature if self.measure == 'Temperature' else relative_humidityg)
+
 class Sensors():
     def __init__(self, history=2621440):
         self.starttime = (datetime.now(), perf_counter())
@@ -78,9 +104,12 @@ class Sensors():
     def scan(self):
         # FIXME: should scan, apply stored data and return this
         self.available_sensors = {
-            'T_ext': Temperature1W('28-06214252b671'),
-            'T_food': Temperature1W('28-062142531e5a'),
-            'heater': GPIOState(22),
+            'T_food':     Temperature1W('28-06214252b671'),
+            'T_ext':      SHT40('Temperature'),
+            'H_ext':      SHT40('Humidity'),
+            'heater':     GPIOState(22),
+            'humidifier': GPIOState(17),
+            'fan':        GPIOState(27),
         }
 
     def list(self):