Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening project. There are two 1/2" (Nominal non-taped National Pipe) outlets. Normally, the valve is closed. When 12VDC is applied to the two terminals, the valve opens and water can push through. The valve has a gasket arrangement inside, so there is a minimum pressure requirement of 0.02 Mpa (3 PSI). Also, liquid can only flow one direction.
Adafruit tried this solenoid at various DC voltages and found they could actuate it down at 6VDC (although it was a little slower to open). Here is the current draw table for various voltages. Adafruit suggest a TIP120 or N-Channel power FET with a 1N4001 kickback diode to drive this from a microcontroller pin. For a power supply, Adafruit's 9V 1A or 12V 1A power adapters will do the job.
If you want a beefier water valve, they also carry a brass version which does not have a minimum pressure requirement and can be used with liquid flow in either direction.
These solenoids are not rated for food safety or use with anything but water.
- 1/2" Nominal NPS
- Working Pressure: 0.02 Mpa - 0.8 Mpa
- Working Temperature: 1 ℃ - 75 ℃
- Response time (open): ≤ 0.15 sec
- Response time (close): ≤ 0.3 sec
- Actuating voltage: 12VDC (but they found it would work down to 6V)
- Actuating life: ≥ 50 million cycles
- Weight: 4.3 oz
- Dimensions: 3.3" x 1.69" x 2.24"