New Sensor Module: Flowsensor

[mschlenstedt]

Hi,

based on the new sensor module "yfs201" I created a more flexible module, which will work with almost all flow rate sensors. These sensors create a pulse frequency, which can be calculated into a flow rate by a formula (factor).

While the yfs201 module has a fixed factor of "7", the factor of this module is configurable in the config.

From YF-S201 manual:
Pulse Characteristic: F = 7 * Q (L/MIN).
Pulse frequency (Hz) / 7.0 = flow rate in L/min
==> Factor = 7.0

From YF-DN50 manual:
Pulse Characteristic: F = 0.2 * Q (L/MIN).
Pulse frequency (Hz) / 0.2 = flow rate in L/min
==> Factor = 0.2

Example config for YF-S201:

sensor_inputs:
- digits: 4
  module: meinflowmeter
  name: meinsensor
  retain: true
  pin: 17
  factor: 7
  interval: 10
sensor_modules:
- module: flowsensor
  name: meinflowmeter

If you have a more complex formula, you can use "1" as factor. You will get the frequency in Hertz (Hz) this way and the real flowrate can be calculated by another software/system/whatever.