Dispensing aroma with humidifier

The idea of using humidifier to dispense aroma is not new. One other blog suggest the use of ultrasonic mist maker for this purpose - which I do not favor.

What is my approach then?

A simple arrangement - a plastic tank that feeds aroma solution to the humidifier water pan by gravity. My initial thought was to use an electronic timer to add some aroma solution daily. But it is not synchronized to the humidifier operation.















So I wired the solenoid valve to the hygrostat controller. Picture below shows the attachment of solenoid valve in-line with a manual valve which control the flow rate. The aroma solution is diluted as the humidifier operates over a variable period.




















My hygrostat controller relay has 2 pole, 10A relay contacts (wired in parallel can handle 20A) that easily handle the extra electrical load of the solenoid valve. The 'turn-on' switching current pulse is generally quite high.