Home Automation Rule Engine

Simulation Clock

Time speed 12 h/min

Climate Setpoint

Target temperature 21°C

Automation Rules

Motion-activated lighting Auto climate control Daylight harvesting

Live Readouts

Time of day

08:00

Indoor temp

21.0°C

Power draw

0 W

Energy used

0.00 kWh

How it works

The house runs a small IF-THEN rule engine, re-evaluated every frame against live sensor state — exactly how a real home-automation hub (Home Assistant, SmartThings) chains triggers to actions:

Motion sensor:   IF occupant in room AND rule ON
                 THEN light(room) = ON, hold 3s after they leave
Daylight rule:   IF sunlight b(t) > 0.55 AND rule ON
                 THEN light(room) = OFF  (overrides motion)
Climate rule:    IF T_indoor < setpoint − 0.5  → heater ON
                 IF T_indoor > setpoint + 0.5  → AC ON

Sunlight and outdoor temperature both follow the simulated clock t (hours):

b(t)     = max(0, sin(π·(t−6)/12))      // 0 at night, 1 at noon
T_out(t) = 15 + 8·sin(2π·(t−9)/24)      // °C, warmest mid-afternoon

Indoor temperature follows a first-order thermal (RC) model integrated each frame, with heating/cooling only applied while a device rule turns the unit on:

dT/dt = k_loss·(T_out − T) + k_heat·[heater] − k_cool·[AC]

Power draw sums every active device (12 W per bulb, 1500 W heater, 900 W AC); energy is that power integrated over simulated hours, in kWh — the same accounting a smart meter performs.

Time speed — how many simulated hours pass per real minute; Pause freezes the clock.
Home / Away — toggles whether the occupant (and therefore motion) exists at all.
Setpoint — the climate rule's target indoor temperature.
Rule checkboxes — disable any rule to see the house behave without it (e.g. lights never turning on, or the house drifting to outdoor temperature).

Light ON Heater ON AC ON

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