Simulated sensor

The simulated sensor platform provides a simulated sensor that generates a time-varying signal V(t) given by the function:

V(t) = M + A sin((2 pi (t - t_0) / w) + P) + N(s)


  • M = the mean value of the sensor
  • A = the amplitude of the periodic contribution
  • t = the time when a value is generated
  • t_0 = the time when the sensor is started
  • w = the time period in seconds for a single complete cycle of the periodic contribution
  • P = the phase offset to add to the periodic contribution, in units of degrees
  • N(s) = the random Gaussian noise with spread s

The output will be limited to 3 decimals.


To add a simulated sensor to your installation, add the following to your configuration.yaml file:

  - platform: simulated

Configuration Variables


(string)(Optional)The name of the sensor.

Default value: simulated


(string)(Optional)The unit to apply.

Default value: value


(float)(Optional)The amplitude of periodic contribution.

Default value: 1


(float)(Optional)The mean level of the sensor.

Default value: 0


(seconds)(Optional)The time in seconds for one complete oscillation of the periodic contribution.

Default value: 0


(float)(Optional)The phase offset (in degrees) to apply to the periodic component.

Default value: 0


(integer)(Optional)The seed value for the random noise component.

Default value: 999


(float)(Optional)The spread is the range of the randomly distributed values about their mean. This is sometimes referred to as the Full Width at Half Maximum (FWHM) of the random distribution.

Default value: None


(boolean)(Optional)Whether to simulate from epoch time (00:00:00, 1970-01-01), or relative to when the sensor was started.

Default value: true


To give an example of simulating real world data, a simulated relative humidity sensor (in %) can be added using the following configuration:

  - platform: simulated
    name: 'simulated relative humidity'
    unit: '%'
    amplitude: 0 # Turns off the periodic contribution
    mean: 50
    spread: 10
    seed: 999
    relative_to_epoch: false