Smart Water Controller

Vegetation in institutions, schools, and flower farms often requires manual or artificially controlled machines to water, and the workload is large and complicated. Many families have raised a lot of flowers and plants, but if the owner wants to spend longer vacations or tourism, he is worried that flowers will wither because of no watering for a long time. Here we introduce an intelligent controller circuit that is novel in design and simple in structure and is suitable for use in enterprises, institutions, and homes for automatically watering flowers and plants.

First, the working principle Intelligent watering controller electrical schematic diagram shown in Figure 1, 220V AC power supply by the transformer step-down and full-wave rectification, after the three-terminal regulator generates +12 V and +5 V DC voltage, respectively provided to the CD4069 , Q1 and Q2. Place a humidity sensor in the vegetation sampling soil (can be self-made, such as soldering out the wire shown in Figure 2 on a universal board, and then drawing the two end wires as the ends of the humidity sensitive resistor) when the vegetation is soil When it's dry, the humidity sensitive resistor shows a large resistance, Q1 cuts off, and pin 1 of CD4069 shows a low potential. After the internal inverter, pin 2 outputs a high potential, Q2 turns on, and the relay coil closes the normally open contact due to current passing through it. The valve of the solenoid valve is opened, the water channel of the sprinkler water pipe is turned on, and the sprinkler starts to spray water. When the water is sprayed for a certain period of time, the humidity of the sampling soil becomes smaller, the moisture resistance resistance exhibits a small resistance, Q1 conducts, and the foot of CD4069 shows a high potential. After the internal inverter output pin 2 low, Q2 cut-off, the relay coil power loss, normally open contact is open, the solenoid valve is closed, the sprinkler stops spraying, until the soil moisture becomes larger again. The 20K potentiometer is used to adjust the water spray sensitivity. SW is a series push button switch on the branch line of the humidity sensitive resistance. When the branch is disconnected, the electromagnetic valve can be forced to open to spray water. Figure 3 shows the finished product appearance.

Second, component selection Transformer T with a commercial 220V/12 × 2 small power transformer relay, K with a commercially available ordinary working voltage is 12V electromagnetic relay, solenoid valve can be used with AC 220V two two ventilation fluid control valve, other components without special Claim.