Picture of Make an automatic plant light
This light helps your plants grow.

I got the idea from the Garduino, but nothing is taken from it. The schematic and the program are mine.

This plant light gives your plants 4 additional hours of light per day. When it gets dark, it turns on and after 4 hours of darkness, the light turns out. The light restarts when it detects light.

Step 1: Parts

Picture of Parts
You will need:

1x ATTiny26
1x 5V Wall adapter
3x Red LEDs
1x 30ohm resistor
1x 20 ohm resistor
1x 100kohm resistor
1x 50kohm resistor
1x power socket
1x power plug

plant container
1-40 of 59Next »
chrwei6 years ago
add a solar panel and a battery and ditch the wall-wart for extra awesomeness
awang8 chrwei6 years ago
But then you'll need sun to shine on it and if the sun's shining on it then it's won't need growth lights... Not awesomeness... More like weirdness...
chrwei awang86 years ago
uh, sun shines during the day, charges battery, sun goes down, lights run off battery.... never seen a solar landscaping light?
awang8 chrwei6 years ago
The main purpose of this is to grow plants indoors. If you're taking it outdoors than it won't need growth lights because it's already exposed to the required spectrum for the required amout of time.
poiihy awang82 months ago

No, the purpose of this is to give plants 4 extra hours of light.

chrwei awang86 years ago
solar panels work inside too
awang8 chrwei6 years ago
Uhh... No they don't.
pullinsb awang86 years ago
Uhh... yes they do. Ever used a calculator with a solar panel on it? Most of the time a person will use them at their table/desk and not outside. Solar panels work inside because they turn light into electricity (hence the name photovoltaics). Of course the light would be more intense outside. Why not use this near a window, inside, where it gets the natural sunlight they crave and then your LEDs will give the extra 4hours. All in all, great i'ble.
Indoor light also works on solar calculators.
DemonDomen (author)  awang86 years ago
Actually, the purpose of this project is to add 4 additional hours of light. The plant gets the natural amount of light plus 4.
But plants grow best with the natural amount of light. If you add more light it's not organic because the leafs are forcing the plant to take extra nutrients... Unneeded nutrients...
chrwei awang86 years ago
but a tomato growing in December can't get the the correct amount of natural light
awang8 chrwei6 years ago
Yes it can! It's summer in December!
DemonDomen (author)  awang86 years ago
Derin awang86 years ago
And if you grow a potato,then the plant will be a couch potato!
awang8 Derin6 years ago
Why not grow potatoes inside a couch-shaped container? Not a couch potato, a potato couch!
just use some capacitors?
Not as good as batteries.

hello DemonDomen, very smart design. what if you used a better light source... check out my design! we can add automatic watering too...


love & peace

ASCAS4 years ago
You do know that there is a cheaper and easier way to to this. I made a circuit that only uses 4 components.
1 - LDR
1 - NPN Transistor
1 - Resistor
1 - LED
DemonDomen (author)  ASCAS3 years ago
Your LED would glow all night, but mine turns off after 4 hours of darkness.
oh so thats why you used a IC chip. You know that mosfets works good too :)))for a adjustable timer with a light sensor :))) other than that nice job :D
like this...
drgnflyz4 years ago
I am going to adapt this (along with the solar panel and battery) to give my chickens the extra 4 hours of light they need (inside their small coop) during the winter so that they will continue to lay eggs! Thank you for the instructable!
Zhelnot5 years ago
can u show me the sketches?
what are the plants growing ln
awang86 years ago
I'll be using this for my hydroponics system i'm going to set up one day... One day... I'll be making some heavy modifications. Basically, it means I won't be using a microcontroller. I'll use one of those power timer thingys and that also saves the hassle of running your wall-wart 24/7.
can someone give me an example of the correct leds to use from mouser. They have so many different types of leds, and i'm not sure exactly what i need. Red LEDs is a bit general. haha
DemonDomen (author)  kanikedude036 years ago
Jon3166 years ago
the ATTiny26 dat your asking for is it a LM324 Quad Op Amp i saw dis one in radio shack and it looks like the one that is demonstrated in the pic
DemonDomen (author)  Jon3166 years ago
No. The ATTiny26 is a microcontroller, the LM324 is an amplifier.
awang86 years ago
Are you sure red LEDs are enough? I thought you're supposed to use a mixture of red, white, ultraviolet and infrared.
DemonDomen (author)  awang86 years ago
Red is included in white. I agree on the UV and IR part, but I'd have to buy the leds.
Oh wait, yeah. White has a mixture of all colours. Forgot.

Once someone told me you need green lights to grow plants. Totally disagree!
green lights are the worst the color of the plants reflects green light so they would die in only green light. red is best
Thanks for sorting this all out guys - i was going to ask if red LEDs were enough myself, but i've just read all this and now im sorted. cheers lads
In conclusion, red, blue, ultraviolet and infrared make a perfect greenhouse growth light.
w00t lol. is the infrared there for heat (whiche you dont get out of LEDs) or for the plant for some reason?
The IR here is not the heat type of IR,it is the light type.
1-40 of 59Next »