Simple Light Sensor Circuit - Leds on by night off by day (tree of light) JB

i like to use LED's as house/table lights but my first LED lights had no sensor
but only a joule thief, and they would burn for about 4 to 5 days on 1.5v

this light tree, has a light sensor that switches the LED's on by night and off by day, im using 2 AA bateries (3v) and the LEDS can run on this for about 3 to 4 months, i tried using a joule thief for this light tree but its like the like sensor doesnt like that

the circuit for the light sensor is in the movie

I could add a solar panel that will charge the battery during the day, and light the Leds, and at night use the battery power

you could use a photo led diode as a replacement for the photo resistor

Category:

Science & Technology

Tags:

• Light
• sensor
• Led
• Leds
• JB
• johnnblade
• 3v
• 2aa
• 2n222a
• transistor
• photo resistor

[insAneTunA]

I finally ordered some photo diodes and 16 ultra bright LED's I'm going to modify my garden lights from 12 volt light bulbs into LED lights, I want to use this circuit to control my garden lights. I'm using a car battery and 4 small solar panels. The panels are normally used to keep an unused battery charged when the battery is stored. Each panel is only 125 mA but 4 panels should be more then enough to keep the car battery charged.

Greets from Holland, iT

[JohnnBlade]

@insAneTunA you could also use a joulethief inbetween yr solar and LED's

then probaly u could use 1 or 2 solar panels.

laat me weten als je het gefixed hebt ;)

groeten van Amsterdam

JB

watch ? v=KteDmnm4H2k

[insAneTunA]

Heb 1 fotodiode geeft 260 mV, 1 40K weerstand, 1 ultra bright LED 3.4V 25mA, 3x oplaadbare batterij totaal 3,8 volt, 1x 2n2222 transistor, maar krijg het niet aan de gang. Heb ook met nul tot 100K weerstand voor de LED getest. Joule thief werkt prima, heb tor vervangen voor metalen 2n2222 tor, tot mijn stomme verbazing kan ik nu 20 ultra brights redelijk fel oplichten met een enkele oplaadbare 1,2 Volt batterij, en het is dat ik niet meer LEDS heb, want volgens mij kan ik nog wel even doorgaan.

[insAneTunA]

@insAneTunA I am amazed, here I have 20 ultra bright LEDS (10mm) shining bright with only one rechargeable 1,2 battery !!! Previously I could light up a few small LEDS but I changed the transistor, one that never worked before, and all the sudden it works very well, and the circuit with 20 LEDS in Parallel is only drawing around 190 mA. These LEDS are rated for 3,4 Volt and 25mA each !!! Never had this working so well, I will record a video.

[JohnnBlade]

@insAneTunA, it would be a miracle if u managed to light them up without a joulethief

or are you using a joulethief, cause 1.2v lighting up 20 bright LEDS, i gotta see that!, cant wait for yr vid

and what kind of transisstor did you use, i mostly/only use the 2n222 transistor for my joulethief

M.v.g

JB

[JohnnBlade]

@insAneTunA , goed werk man,( zag deze bericht niet, mijn vraag is daarmee beantwoord ), i have seen some people lighting up2 about 75 small leds on a joulethief, dus zeer goede besparende kerst lampen dit jaar :P

[TXTCLA55]

Could I get an exact list of the parts you used? Thanks.

[vickiipa]

@JohnnBlade Hi! John, your video is fantastic. How is going on with your experiment with the Solar? I'm working on a project of Solar cell. My idea is about using solar cell to hook the sunlight, then collect solar energy in rechargeable battery. Next connect the battery to light circuit like your video to make the light shine automatically at night when human walk pass. That is a reason why, I ask you about your testing whether it success or not. So I may success on my project too. Many thanks

[ThePrudhviram]

what is 40k here,please tell me........

[lolymoore]

i have been looking for that same project on how to do it please give me step by step on how to ( an it there some were i can get flexible board to at a cheap price ) if so please let me no thank u

[insAneTunA]

@insAneTunA Ik moest eerst jumper kabeltjes maken, wat een aardig klusje is. Want al die kabeltjes met kroko klemmetjes was niet echt overzichtelijk, en bovendien verbruikte het iets meer stroom. Groetjes,iT

[insAneTunA]

@JohnnBlade hahaha ja inderdaad, nu ik zit er zelfs aan te denken om mijn hele huis van LEDS te voorzien, zoveel; verlichting gebruik ik niet. Ik heb een andere schemerschakeling gemaakt, van het circuit online forum, en deze schakeling werkt met mijn fotodiode, maar vooralsnog niet in combinatie met mijn joule thief. Ik ben geen expert wat betreft elektronica, ik bouw dingen na, en al doende leer ik bij. Video is in de maak, heb eerst alles overzichtelijk aangesloten op mijn breadboard :-)