LED Dominos Using a 555 Timer - The Learning Circuit
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- Опубліковано 28 лис 2024
- In the last lesson, we learned what happens inside a 555 timer to make it work. In today’s episode, Karen uses 555 timers to make LED “dominos”. Each unit has an LED connected to the output of a 555 timer and an LDR attached to the trigger. When the LDR senses light, the 555 is triggered turning the light on for a brief period of time. When multiple units are placed in a row, each one triggers the next. The duration that each light is on is determined by an “RC circuit” made of a resistor and capacitor. Changing their values can change the duration that the light is on : bit.ly/2rTbKMg
The idea for this project came from a video made by Randy Elwin back in 2011. Karen uses his idea to make a similar device to show off using a 555 timer in a monostable circuit. (Learn more about monostable circuits in the NEXT lesson about 555 timers.) Shining a light on the LDR triggers Pin 2 and the 555 is “set” on. The RC circuit connected to pins 6 & 7 eventually cause the voltage at Pin 6 to go High enough to reset the 555, turning the LED off.
Video Link: • Le Dominoux
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Karen changed her design to run off a 9V battery, but that isn’t the only change. Look closely at both the original and then Karen’s schematic designs. Since the original design used a 3V battery, how does the difference in design change the behavior of the circuit?
Post your hypothesis in the comments below!
More power substantially changes all of the circuit's variables?
Great project! Would like to see them in a circle so they would continuously chase each other's tail.
Nice educational video! Amazing how 50-year old electronics tech is still useful today.
She's a good teacher.
She's the first female teacher that ever made me understand something
Thanks Karen your projects make learning electronics interesting.
Very cool, I like the way you explain everything clearly and slowly and how it all works when put together, thank you 👍... Thanks Karen you make learning and sharping our skills😂 fun 👍❤️
Great learning circuit and cool idea! :) Basically, bare bones and nothing to program.. A little bit nostalgic.. i think, kids gonna love it..
Pretty cool, Karen!
Can you build the dominos units without the 555 ? only with resistors, capacitors, and transistors?
Is the animation at 2:22 wrong? She's talking about pulling the trigger low and the overall 555 output going high, but I think the animator has mistakenly shown !Q going high instead. The animation isn't showing the inverter that should follow !Q and invert the high !Q into a low 555 output. (This is my first time learning about 555's. I might be misunderstanding something)
That is so cool. You have a lot of Ben's influence! Great video!
Thanks, Karen!
you make a fantastic introduction for begginers i mean beg - ginners because that is what we are, Asking for Help to get started .
i think as a level -58 all is i wanted to do shine an LED on something, but then it (bitMe) so in 4 months (some people learn easy i dont takes abit to sink in) LOL , i still no sweet f a,
compered to what i want to know
That's a fun circuit!
Great video! I will have to watch this one a few times. :)
I was wondering where you wandered off to! :)~
Awesome video, thanks!
3:07 I believe R3 should be just 200 Ohm, not 220 kOhm (I understand that this is just a typo)
Nice project idea 😁👍
Can I Used push bottom switch in place of Flashlamp you that used?
Show us how to use the LM386 and the CD4060.
they have data sheets you know xD
@@HazeAnderson I am not far enough alont to know how to read those yet. Perhaps that would also make a good video.
@@claytonbenignus4688 oh data sheets are incredibly difficult to translate into what you need to know ... but they often come with example circuits and that can bootstrap you into success.
You are apply 10k in #THE ... Soo how it will be High stage...????
Excellent !!!!
Good
Wow
Super is
2nd!
pro tip: to avoid breathing in dangerous solder and burning flux fumes, smoke a cigarette, so the nasties have to pass through a filter. 😀
Gloves 🧤 please when soldering
Why?
@@naits7 yea, why?
never had gloves while soldering. they get in the way, its really impractical
I work in the manufacturing industry - no one wears gloves when soldering, even when we have to use leaded solder...
Just wash your hands!