Rain Metering for Irrigation management

In this simple guide you can find how to setup a Rain meter device to measure rainfall during the last 48 hours.

  1. HARDWARE - TapHome Rain Meter Device with water container available in our Store

  • Fix the box horizontally (use water-level) and make sure there is an empty space underneath.
  • Please cut the connector at the end of cable to get two wires (red and green one).
  • Connect red wire to +24V and green one to any UI input (24UI, Core UI, 2UI, 6UI/6OC etc).


  • Go to Taphome application and enable related input as Impulse Counter. This creates Impulse counter device within the TapHome.
  • Go to Impulse counter detail overview, press Statistics and Add new statistics - Sum/Integral - Period to now and set 2 days period.


  • Go to Settings / Variables / Add new variable / General variable and use proper label e.g. "Rainfall in mm/48hours".
  • Go to Rainfall in mm/48hours variable and Add newSmart Rule Formula as an input Smart Rule. Use following settings to calculate the rainfall in the last 48h (Rain meter device use 1 impulse per 0.2794mm/1m2 of rainfall so 1mm is 3.579 impulses).

  • Now you have working rainfall meter with the last 48h period statistics. This could be used to enable/disable automatic irrigation system managed by TapHome.