aREST Sensor

The arest sensor platform allows you to get all data from your devices (like Arduinos with a ethernet/wifi connection, the ESP8266, and the Raspberry Pi) running the aREST RESTful framework.

To use your aREST enabled device in your installation, add the following to your configuration.yaml file:

# Example configuration.yaml entry
sensor:
  platform: arest
  resource: http://IP_ADDRESS
  name: Office
  monitored_variables:
    - name: temperature
      unit_of_measurement: '°C'
      value_template: '{{ value | round(1) }}'
    - name: humidity
      unit_of_measurement: '%'
  pins:
    A0:
      name: Pin 0 analog
      unit_of_measurement: "ca"
      value_template: '{{ value_json.light }}'
    3:
      name: Pin 3 digital

Configuration variables:

• resource (Required): IP address and schema of the device that is exposing an aREST API, e.g. http://192.168.1.10.
• name (Optional): Let you overwrite the the name of the device. By default name from the device is used.
• monitored_variables array (Optional): List of exposed variables.
  • name (Required): The name of the variable you wish to monitor.
  • unit (Optional): Defines the units of measurement of the sensor, if any.
  • value_template (Optional): Defines a template to extract a value from the payload.
• pins array (Optional): List of pins to monitor. Analog pins need a leading A for the pin number.
  • name (Optional): The name of the variable you wish to monitor.
  • unit_of_measurement (Optional): Defines the unit of measurement of the sensor, if any.
  • value_template (Optional): Defines a template to extract a value from the payload.

The variables in the monitored_variables array must be available in the response of the device. As a starting point you could use the one of the example sketches (eg. Ethernet for an Arduino with Ethernet shield). In those sketches are two variables (temperature and humidity) available which will act as endpoints.

Accessing one of the endpoints (eg. http://192.168.1.10/temperature) will give you the value inside a JSON response.

{"temperature": 23, "id": "sensor01", "name": "livingroom", "connected": true}

The root will give you a JSON response that contains all variables and their current values along with some device details.

{
   "variables" : {
      "temperature" : 23,
      "humidity" : 82
   },
   "id" : "sensor01",
   "name" : "livingroom",
   "connected" : true
}

return_value contains the sensor’s data in a JSON response for a given pin (eg. http://192.168.1.10/analog/2/ or http://192.168.1.10/digital/7/).

{"return_value": 34, "id": "sensor02", "name": "livingroom", "connected": true}