light sensor making steps- www.buildcircuit.com
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Uploaded by ldremail on Nov 8, 2010
Make dark and light sensor using LDR. Please visit this site:
http://www.ldrengineering.org/darklight-sensor-using-transistor/
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show! nice :D gostei muito
iorirochi 3 days ago
Can I use the same circuit layout but with a PIR?
KungFuTze 2 weeks ago
what photocell would you need for light to turn off the LED and for no light to turn it on? for example: laser alarm
Studio1991 3 weeks ago
good
htn2205 1 month ago in playlist circuit
this was a good video
tradecycles 1 month ago
@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
desertbard 1 month ago
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
mosadeain 2 months ago
I got it working. I took it near a window where there is enough light and the LED came on.
sharauro 2 months ago
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 2 months ago
sir i have a doubt can we use a buzzer instead of LED
leoblaster101 3 months ago