Blinking LED with Cycle

2s

You mean 1s led on and 1s led off

I assume T is period, which is on time plus off time. So ask your instructor what the duty cycle should be. If not specified, I would assume 50%.

https://en.wikipedia.org/wiki/Duty_cycle

Hint: You might want to check out 555 timer circuits.

This reminds me of the experiment my 12 year old son and I did with the CMOS version of the 555 and a variable voltage DC supply. Cut the duty cycle down under ten percent and ramp up the voltage. With less than a ten percent duty cycle and 20 or 30 cps--WOW did that LED shine. Twenty five years later, he still recalls it. Great way to excite the inquiring mind.

The effective turn on and off time for the LED itself is so small that you do not need to take it into consideration.

For what it's worth I'd use a clock crystal oscillator and some digital counters to blink the LED, but, your teacher may want you to use an analogue timer like the 555

Surely it would be longer than that. The electron flow may stop in that time, but the heat generated would extend the light output, tho' not at the same frequency.

Sorry, that's the best I could do with my stopwatch.

I doubt that trungsave96's instructor will have equipment sophisticated enough to measure this anyway.

Due to parasitic inductance and capacitance, the turn-on and turn-off time of the circuit you use to drive the LED will very likely be far longer than the LED's response.

The light output from the LED is proportional to current. Put a resistor in series with the LED and connect a good oscilloscope across the resistor to measure the rise and fall times of the square wave.

I’d do it with two relays and a capacitor, then the silicon chip hadn’t been invented in 1942, Mildred.

Ah, but neither has a LED, whatever that is...

-- Mildred

I recently built a 3D zoetrope consisting of 10 wooden doves mounted on the end of ten spokes, the doves wings fixed in sequence from max. up to max. down. To reduce costs I used three automobile LED's as a strobe to freeze frame the spinning doves (turning about 2 revs/sec.) and thus create the illusion of each dove flapping its wings while fixed in position at the end of each spoke. Worked just fine, so on/off time of LED's fast enough for this.

Have you got a link to a video?

Here's a link https://youtu.be/MSw4ZeaOV_s

Just recently uploaded. Title: Peace Movement. Strobe effect starts at 23 seconds. The effect is smoother in reality than on film. I think the light/dark jumpiness is caused by the strobe frequency being very close to the frames per second frequency of the camera. A fun kinetic art project. (Edit: It seems the link doesn't work - but the YouTube title is "Peace Movement (3D Zoetrope)"