HELP! Need schematic for a single pot plant watering project

[ahling83]

Hi, i'm currently doing a project on a system that can detect if the soil of the pot plant is dry or not...and if its too dry....the plant will be automatically be watered. Please help me. i need to build up a circuit for this project and i really really need a schematic diagram if anyone has it. THANK YOU!

 

[jbeng]

In saying "pot plant" I assume (possibly erroneously) that you mean a "potted plant" (or a plant growing in a pot) as opposed to marijuana? :?
Not that it necessarily matters ...
Here's a link to a thread for a moisture sensing circuit:
https://www.electro-tech-online.com/threads/how-to-remove-black-protectant-from-tiny-ics.3555/
And one from Audioguru:
https://www.electronics-lab.com/projects/science/018/index.html
JB

 

[ahling83]

In saying "pot plant" I assume (possibly erroneously) that you mean a "potted plant" (or a plant growing in a pot) as opposed to marijuana? :?
Not that it necessarily matters ...
Here's a link to a thread for a moisture sensing circuit:
https://www.electro-tech-online.com/threads/how-to-remove-black-protectant-from-tiny-ics.3555/
And one from Audioguru:
https://www.electronics-lab.com/projects/science/018/index.html
JB

LOL...yeah..what i meant was potted plant...not marijuana...
Thanks a bunch

 

[audioguru]

Hi Ellen Ahling,
You can have an automatic marijuahna watering circuit and hope the cops don't bust you. :lol:

I corrected and improved the original Plants Watering Watcher-1 project because it didn't do what it was supposed to do:
1) I added a capacitor to make it dim its LED when the soil was wet.
2) I used a 74HC IC because the original Cmos IC failed when the battery voltage dropped below 3V.
3) I added a transistor to drive the LED brightly.
4) I added a low-frequency oscillator to pulse the LED to allow the battery to last for a long time.

Your application doesn't need any of these fixes and the original circuit should work fine when modified. The original circuit is here:
https://www.electronics-lab.com/projects/science/008/index.html
I modified its schematic for you but haven't tried it:

 

[ahling83]

Thank you audioguru for the prompt reply!

I'll give it a go...and see if it works.. THANKS!

 

[ahling83]

**broken link removed**

Hi audioguru,

was wondering... what is the Relay you're referring to? and what type of water pump do you suggest that i should use. i noticed that the LED is missing in the picture. :shock: Thanks

 

[audioguru]

Hi Ellen,
I put an LED back into the circuit for you.
Select a water pump to water your pot plant, oops, I mean potted plant that is powered from the mains perhaps designed for a fish aquarium.

I couldn't find a 6V relay so I changed the supply and relay rating to 12V.
Down Under, Farnell has an Omron G6D-1A, 250VAC 1A contacts, 12V relay that is suitable.

 

[ahling83]

Thank you audioguru for your help...appreciated it i'll try go work on the circuit now...thanks again

 

[audioguru]

Hi Ellen,
As per your instant message, here is a complete circuit that I think will work if you set the pot to about 100k. :lol:

 

[audioguru]

LM3914 or LM3915:

 

[ahling83]

THANKS!!!!! audioguru

really appreciate for all ur help and ur prompt reply!

 

[netsnanet]

plz give me some support about the modified plant watering watcher
1. why u use 6v dc source?
2. why u use 6v as vdd supply voltage?
3. what is the value of pin # 9 in the circiut for IC1C ?
4. is IC1A connection can taken as NOT gate?

 

[4pyros]

plz give me some support about the modified plant watering watcher
1. why u use 6v dc source?
2. why u use 6v as vdd supply voltage?
3. what is the value of pin # 9 in the circiut for IC1C ?
4. is IC1A connection can taken as NOT gate?

This post is over 6 years old!
You should have started your own and linked to this one.
Luckly for you audioguru is still around and may help.

 

[large_ghostman]

plz give me some support about the modified plant watering watcher
1. why u use 6v dc source?
2. why u use 6v as vdd supply voltage?
3. what is the value of pin # 9 in the circiut for IC1C ?
4. is IC1A connection can taken as NOT gate?

Sure as AG's unofficial agent the fee is $50 per min plus 25% commission fee for me. OR you could try again and explain why etc etc etc

 

[large_ghostman]

Oh and its 9 years old! nearly as old as me!! why did you think the original author would still be around? He is but why did you think that after 9 years??