Automatic On Off Light Switch with Phototransistor
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- เผยแพร่เมื่อ 10 มิ.ย. 2024
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A simple circuit to turn on and off a device to illustrate the use of a phototransistor
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Thanks, Ludic! Much appreciated!
Saudações LS Science. Nada mais simples que a simplicidade deste circuito. Parabéns. Tudo de bom.
Good video!
Thank you.
Very nice.
Thank you very muchhhh!!!!
Excellent video as always. Thank you for making it. Now, it would be nice to see you put an electro-magnet (one of the many you have made with magnet wire and bobbin) as a load instead of the light bulb in that circuit, so that it would push or pull a, or multiple neodymium magnet/s hot glued to a rotating disk or wheel when it is energized, and control that on-off situation with a permanently on light bulb against the photo sensor and allow the light path to the sensor be cut-off by rotating motion of a blade or multiple blades, with the blade's motion provided by the motion coming from the magnet being pulled or pushed. I am sure you get the idea and you already have thought of many variations. I think this make a good next project which will add to the number of different motors you have made to show in TH-cam. I have enjoyed seeing them all.
I like your idea! Will give it a try
Ludic Science
I have also had this idea and I’m curious if it would work. Would the phototransistor switch fast enough to turn the rotor reliably.
Awesome!
Nice little project! Please consider making a video showing a circuit where the lamp is turned on when the photoresistor is not illuminated.
you can do that with an NOT it is very simple to make with a couple transistors
Gostei deste projeto ele é bem simples! Rio de Janeiro RJ Brasil
Luís Antônio Marrega. Saudações de SP Brasil. Tudo de bom.
As usually short and informative. As should be.
Is there a substitute for pt331c?
Can we construct an oscillator using phototransistor ?
What if I wanted to do the opposite with the phototransistor? I mean switch the bulb on when light is sensed, and bulb goes off when dark is sensed?
How would the circuit change?
Thank you!!
Use a photodiode and a transistor instead
Can I use an LDR instead of phototransistor
www.electronicshub.org/light-sensors
Try a white(or different color) LED, read on using a LED as LDR:
makezine.com/projects/make-36-boards/how-to-use-leds-to-detect-light
Then do like the picture on the left, there with an NPN transistor
:hades.mech.northwestern.edu/images/2/24/Photo_comparison.png
hades.mech.northwestern.edu/index.php/Photodiodes_and_Phototransistors
Maybe it works, not sure
Cool
I knew of photo resistors but have never heard of photo transistors before!
ten littleindians
You may need to watch this
th-cam.com/video/DNAgJrnj4EM/w-d-xo.html
Thanks for the link! I'm in the middle of designing a Laser Harp and your link pointed me in another direction for the beam detection part of my circuit. For my use I'm planning to keep it all digital and maybe use the photo diode since the response time seems to be faster. Other people have used photo resistors in their versions of a Laser Harp and it's been a flaw in getting them to trigger correctly.
en.wikipedia.org/wiki/Photodiode#Other_modes_of_operation
Thanks for the link!
ten littleindians I bet you are making a framed one. I made a laser harp not long ago. I use photoresistors. Check the voltage for triggering “high” in arduino. You just need add a corresponding resistor to create a potential divider. The value of the resistor depends on the characteristics of the ldr. Good luck and have fun.
Like this
Disculpe maestro por mi intromision pero la palabra current en ingles se pronunciaria algo mas o menos asi como courent sin demasiada rrr , jaja , soy un gran admirador suyo !
If you want teach English, write in English
Isn't Energy getting lost(by dessipation) during dark condition
Yes there is
I made using Ldr
www.electronicshub.org/light-sensors
Good job :) try a LED serving as LDR :)
makezine.com/projects/make-36-boards/how-to-use-leds-to-detect-light
mthelectronicslab.blogspot.com/2014/09/how-to-make-color-detector.html
You can use LDRs to detect color, using a uC/MCU (or platform like Arduino or Digispark)
duckduckgo.com/?q=Digispark&iax=images&ia=images
th-cam.com/video/On2CqY1niX0/w-d-xo.html
th-cam.com/video/WXvYBl_dgA4/w-d-xo.html
You misspoke in your video. What you should have said is:
1. Light causes the photo transistor to be switched on (i.e. forward biased). This causes the electricity to go to ground & not to the base of the mosfet.
2. No light causes the photo diode to be switched off (i.e. reverse biased). This causes the electricity to flow to the base of the mosfet & to be switched on (i.e. forward biased), so that the electricity will flow through the lamp.
ok
phototransistor is just like an LED. Strange.
1st
good
1st
1st