How to build an easy automatic watering system for seedlings using a Raspberry pi
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- เผยแพร่เมื่อ 12 เม.ย. 2017
- How to set up a simple automatic watering system for seedlings using a raspberry pi, a solenoid, a relay, and a bucket. No pump required. This setup does assume standard Earth gravity. (9.8m/s^2)
The script is below. I wish I could take credit for it, but I used some sample code. It was last year and I cannot remember where I got it. I would be happy to credit the author. There are a million tutorials on how to use the GPIO of the raspberry pi.
I execute the script with a cronjob.
Parts (prices appear to have gone up from what I paid):
1 Raspberry Pi or Arduino or similar device amzn.to/2WPai7P
1 four channel relay from Amazon. amzn.to/2LnOKLm
1 1/2" Hose Barb Gravity Feed Electric Solenoid Valve: ebay.to/2WNH9dm
1 five gallon bucket (Home Depot homedepot.sjv.io/ejKGz)
1 1/2" barb connector with a male thread: (Home Depot homedepot.sjv.io/PnyZQ)
1 piece of female thread PVC compatible with your barb connector
1 rubber washer
Some 1/2" ID hose
clear: amzn.to/2LekvWY
black: amzn.to/2ElBKnF
1 hose clamp that will fit around your hose
Here is the script:
#!/usr/bin/python
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
init list with pin numbers
pinList = [2, 3, 4, 17]
for i in pinList:
GPIO.setup(i, GPIO.OUT)
GPIO.output(i, GPIO.HIGH)
time to sleep = how long the solenoid is open
SleepTimeL = 4
main loop
try:
#set this to the pin where your solenoid is connected
GPIO.output(17, GPIO.LOW)
time.sleep(SleepTimeL);
GPIO.cleanup()
print "Good bye!"
End program cleanly with keyboard
except KeyboardInterrupt:
print " Quit"
Reset GPIO settings
GPIO.cleanup() - แนวปฏิบัติและการใช้ชีวิต
I like this alot! A few ways to get there if you have to order the electronics anyways without the PI. I sure learned that organic. fertilizer lesson the hard way as well!
Looks like a great setup, thanks for sharing. I like the solenoid + gravity replacement for a pump.
+Ben Eagan thanks man. The bucket is also a limiting factor. Worst case scenario, I end up with 5 gallons of water in the basement.
That is much better than a surprise pool in your basement.
That was really cool. Thanks for sharing!
thanks!
Thanks , interesting project
thanks for sharing :)
Envisioned almost the exact same setup myself and then saw this... I think I bought an identical solenoid valve - am about to put it together but glad to see it's already a proven design! One thing you might want to think about is sticking a ~1kohm resistor or a diode across the solenoid to prevent a large flyback voltage spike. Without one, arcing may reduce the relay lifetime (and I have had serial communications problems on other setups due to the noise generated by the flyback voltage)
thanks! good luck
That’s so cool! I want to do the exact same!
Do it!
Awesome!
That's cool. What is the voltage rating of your water pump, and did you power that using an external PSU?
Nice, though the distribution of water in that particular tray doesn't look very good. I might build one.
Hi, Really love this video but What types of wires did you use to connect the relay to the solenoid?
I used low voltage wiring like the kind you would use for a doorbell or something.
Awesome! Does the water ever drain?
+Kayla F out of the pan? No. The plants suck it up. I have it timed just right. Little trial and error..
why do u need to set 4 pin that is in pin list to high?
Can someone please explain the pins that are connected from the pi to the relay?
Hello, this is my school project. I want to add an automatic control system from the server as soil moisture. Are there any code for this goal?
Hello, what if I wanted multiple solenoids? Could I just plug it in the other 3 available slots in the relay?
yes. You can control whatever you like on each relay spot. There are also relays with more positions. 8, or whatever you need.
Could you please show where the cables go . I don't know what ribbble cable goes also the black cables on the solenoid. How does it receive power.
I have a 12V transformer that I just connected some bare wires to and wrapped with electrical tape. As for the wires, it depends on your pi. But you can look up the wires for the GPIO pins to see which one is which. The relay needs power, and ground, and the GPIO pins. There should be indicators on the relay as to what wire goes to what pin. Hit me up on instagram and I can DM you some pix. @oldplanty
Hello. I like this project alot! But is there a clearer tutorial on how to do this project??
I dont have anything written up. I would be happy to answer any questions you have though.
Old Planty I have a question/problem: My raspberry pi is fine and so is the script, it is meant to open the relay to open the solenoid but for some reason the relay doesn’t open. Help?
sir why we use the smart dripping system and any future use of it.where this is used
not sure I understand the question...
Hey I almost did this but there is something wrong with the relay module
Like, the relay is broken?
Old Planty the code is working but the wires coming from the power adapter to the relay module and solenoid are heating up very fast and also the solenoid doesn’t open when the code is activated according to the timer installed in the code
Old Planty the relay module also makes a click noise
@@XiJinping14 1) If your cables are getting hot, that suggests they are too thin.
2) Relays like these are supposed to click.
Simon Duffy when it clicks, nothing happens