light sensor making steps- www.buildcircuit.com

[iorirochi]

show! nice :D gostei muito

[KungFuTze]

Can I use the same circuit layout but with a PIR?

[Studio1991]

what photocell would you need for light to turn off the LED and for no light to turn it on? for example: laser alarm

[htn2205]

good

[tradecycles]

this was a good video

[mosadeain]

i tried to connect a relay insed of the LED but it didn't work , btw the battery i am using is 9volt and the relay is also 9volt ... what is the correct way to connect them and why it didn't work with me

[desertbard]

@mosadeain I don't know what the current draw is on the relay you used, so you might have to get a heavier transistor, but try removing the 470 R resistor. The relay needs more current then the LED which most likely needs only 2 volts. The resistor drops that voltage down to a useful level for the LED.

KD5KZL

[sharauro]

I have used the exact components in this video and made the connections as shown. Yet the LED never lights up. Any thing I need to check?.I tested the NPN transistor using a multi meter and it is good. LED is also good. Anything else I need to check?.

[sharauro]

I got it working. I took it near a window where there is enough light and the LED came on.

[leoblaster101]

sir i have a doubt can we use a buzzer instead of LED

[wooohhhoooo9]

i seee....thank you soooooooo much! i'm gonna make my own.I was wondering if i could put a motor so that when i block the photoresistor,the motor stops moving....do you think thats possible?

[BenOmarbaOmar]

I like your wire u just plug it in with nice socket what is the name of it please? :)

[bhatti298]

very gud keep it ..

think so you will make others viedo like this

[MrDutchrocks]

what do you change to turn around the sercuit (make it turn on as you block the light)?

[ManolisOriginal21]

@MrDutchrocks put the LED in paralell with the emmiter and the collector of the tranzistor and then you will have a not gate. Or you can replace the photoresitor with R2 and R2 with the photoresitor.

[MaximumOverTroII]

For all of you wondering, yes you probably can use voltages above 3V, especially if your LED isn't blue or UV. You should change the value of resistor R1, use an online calculator if you dunno how to calculate LED resistor values.

[ahmadmuzakir27]

thanx bro..i hope you make other great video like this!

[Chamillionaire791]

can i use 3V instead 6v

[akloakn]

can we use a basic 5V instead of 6V?

most the electronic circuit using a 5v source?

[ninadlotankar]

can we use 9v battery instead 6v . . ??

[kizer1346]

Can you replace the LDR sith a soler cell

[Anuragkabatafox]

thanxx dude not for the video but for something other you told me how to use a transister....

[extremeclimax]

nice!