The timer circuit relay for driponics was chattering. This circuit has 2 relays. We use one and the other is idle. The transistor for operating the unused relay was being turned on randomly, as it’s input was floating and picking up stray electrical noise. I grounded the unused input.
2nd imae shows the ATTiny13 microcontroller programmed as a simple timer tacked onto the pcb.
So do we need an electric motor for the continuous spray of nutrients rich water?
However it need not be continuous. If it is drip one needs to pump between 5 to 30 secs per minute. If one is spraying one needs to spray for as low as 5 secs per 5 minutes. The actual timing depends on plant type, growth cycle, ambient humidity and temperature and incase of spray, spray droplet size.