diff --git a/README.md b/README.md
index 6c9203d1..db86a8d1 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,8 @@ Hardware support is provided by specific GPIO, Sensor and Stream modules. It's e
   - LM75 temperature sensor (`lm75`)
   - MCP3008 analog to digital converter (`mcp3008`)
   - ADXl345 3-axis accelerometer up to ±16g  (`adxl345`)
+  - PMS5003 particulate sensor (`pms5003`)
+  - SHT40/SHT41/SHT45 temperature and humidity sensors (`sht4x`)
 
 ### Streams
 
diff --git a/mqtt_io/modules/sensor/pms5003.py b/mqtt_io/modules/sensor/pms5003.py
new file mode 100644
index 00000000..7a0a1157
--- /dev/null
+++ b/mqtt_io/modules/sensor/pms5003.py
@@ -0,0 +1,77 @@
+"""
+PMS5003 Particulate Matter Sensor
+"""
+
+import time
+from typing import cast
+from ...types import CerberusSchemaType, ConfigType, SensorValueType
+from . import GenericSensor
+
+REQUIREMENTS = ("plantower",)
+CONFIG_SCHEMA: CerberusSchemaType = {
+    "serial_port": dict(type="string", required=True, empty=False),
+}
+
+
+class Sensor(GenericSensor):
+    """
+    Implementation of Sensor class for the PMS5003 sensor.
+    """
+
+    SENSOR_SCHEMA: CerberusSchemaType = {
+        "type": dict(
+            type="string",
+            required=False,
+            empty=False,
+            default="pm25_std",
+            allowed=
+                ["pm10_cf1", "pm25_cf1","pm100_cf1",
+                 "pm10_std","pm25_std","pm100_std",
+                 "gr03um","gr05um","gr10um",
+                 "gr25um","gr50um","gr100um"],
+        )
+    }
+
+    def setup_module(self) -> None:
+        # pylint: disable=import-outside-toplevel,import-error
+        import plantower # type: ignore
+
+        self.serial_port = self.config["serial_port"]
+        self.sensor = plantower.Plantower(port=self.serial_port)
+        self.sensor.mode_change(plantower.PMS_PASSIVE_MODE)
+        self.sensor.set_to_wakeup()
+        time.sleep(30) #give fan time to stabilize readings
+
+    def get_value(self, sens_conf: ConfigType) -> SensorValueType:
+        """
+        Get the particulate data from the sensor
+        """
+        #turn sensor off if interval between readings is >= 2 minutes
+        sleep_sensor = sens_conf["interval"] >= 120
+        if sleep_sensor:
+            self.sensor.set_to_wakeup()
+            time.sleep(30)
+        sens_type = sens_conf["type"]
+        result = self.sensor.read()
+        if sleep_sensor:
+            self.sensor.set_to_sleep()
+        return cast(
+            int,
+            dict(
+                pm10_cf1=result.pm10_cf1,
+                pm25_cf1=result.pm25_cf1,
+                pm100_cf1=result.pm100_cf1,
+                pm10_std=result.pm10_std,
+                pm25_std=result.pm25_std,
+                pm100_std=result.pm100_std,
+                gr03um=result.gr03um,
+                gr05um=result.gr05um,
+                gr10um=result.gr10um,
+                gr25um=result.gr25um,
+                gr50um=result.gr50um,
+                gr100um=result.gr100um
+                )[sens_type],
+        )
+
+    def cleanup(self) -> None:
+        self.sensor.set_to_sleep()
diff --git a/mqtt_io/modules/sensor/sht4x.py b/mqtt_io/modules/sensor/sht4x.py
new file mode 100644
index 00000000..640fd91b
--- /dev/null
+++ b/mqtt_io/modules/sensor/sht4x.py
@@ -0,0 +1,57 @@
+"""
+SHT4x temperature and humidity sensor
+"""
+
+from typing import cast
+
+from ...types import ConfigType, SensorValueType
+from . import GenericSensor
+from ...exceptions import RuntimeConfigError
+
+REQUIREMENTS = ("adafruit-circuitpython-sht4x",)
+
+
+class Sensor(GenericSensor):
+    """
+    Implementation of Sensor class for sht4x.
+    """
+
+    SENSOR_SCHEMA = {
+        "type": dict(
+            type="string",
+            required=False,
+            empty=False,
+            default="temperature",
+            allowed=["temperature", "humidity"],
+        )
+    }
+
+    def setup_module(self) -> None:
+        # pylint: disable=import-outside-toplevel,import-error
+        import adafruit_sht4x  # type: ignore
+        import board  # type: ignore
+        import busio  # type: ignore
+
+        i2c = busio.I2C(board.SCL, board.SDA)
+        self.sensor = adafruit_sht4x.SHT4x(i2c)
+
+    @property
+    def _temperature(self) -> SensorValueType:
+        return cast(SensorValueType, self.sensor.temperature)
+
+    @property
+    def _humidity(self) -> SensorValueType:
+        return cast(SensorValueType, self.sensor.relative_humidity)
+
+    def get_value(self, sens_conf: ConfigType) -> SensorValueType:
+        """
+        Get the temperature value from the sensor
+        """
+        if sens_conf["type"] == "temperature":
+            return self._temperature
+        if sens_conf["type"] == "humidity":
+            return self._humidity
+        raise RuntimeConfigError(
+            "sht4x sensor '%s' was not configured to return 'temperature' or 'humidity'"
+            % sens_conf["name"]
+        )