The value of a professional scent machine comes less from its ability to release scent than from releasing it at the right time and at the right intensity. The mechanism that makes this possible is the weekly program and the work/pause cycle on the control board. In this article we cover these two layers and the role of the real-time clock (RTC).
Two-layer scheduling logic
A well-designed scent board solves scheduling in two independent layers:
- When is it active? — which days of the week and which time range (the operating window)
- What does it do while active? — the scenting/pause cycle within the operating window
This separation matters: for example, the machine can be active only during business hours (Mon–Fri 08:00–18:00), but within that window release scent for 45 seconds every 15 minutes.
Layer 1 — Weekly day and operating hours
The days of the week are selected active/inactive individually. This allows scenarios that run on weekdays and stop on weekends, or that run only on certain days.
Operating hours (start/stop) are defined for the active days. In practical products, the start/stop times are kept common to all active days (e.g. all active days 08:00–18:00); only the active/inactive state is day-specific. This approach simplifies setup and reliably covers the most frequently needed scenario (business hours).
Layer 2 — Scenting/Pause (WORK/PAUSE) cycle
Within the operating window, scent is released cyclically:
- Scenting (WORK): the pump is on, scent is released (e.g. 45 s)
- Pause (PAUSE): the pump is off, the scent disperses into the space (e.g. 15 min)
The durations should be adjustable in fine steps (e.g. 5 seconds), because scent intensity varies greatly with the volume of the space, air circulation and the type of fragrance oil. A small office and a hotel lobby require entirely different cycles.
RTC: what happens after a power outage?
The heart of scheduling is the real-time clock (RTC). On a good board, the RTC is powered by a backup battery (e.g. CR2025). As a result:
- When power is lost, the time and calendar are preserved
- When power returns, the program correctly resumes where it left off
- The user does not have to set the time by hand after every outage
Systems without a backup battery (or that are merely counter-based) lose track of time on every outage — unacceptable in professional use.
Reliability: the hidden need of a continuously running device
In a field device that runs for weeks without interruption, a software hang stops the entire program. That is why robust boards include a hardware watchdog: if the software fails to give an “I’m alive” signal within the expected time, the board resets automatically and returns to the program where it left off. This prevents a remote device from silently going down.
How does the user set this up?
The program can be configured from two interfaces:
- On the device: durations, hours and days are set from the menu using a 2×16 LCD and buttons.
- From a phone: the same settings are made with a Bluetooth app; changes are written to the board instantly.
MARG SCENT supports both of these; for details and the menu flow, see the Scent Machine Control Board page. If phone control is the priority, V2 Bluetooth Only is suitable; for both, V3 Hybrid is the right choice.
Are you looking for a scent machine control board with weekly scheduling, a work/pause cycle and an RTC? Review the product → or contact us for a sample.