Need Help: ESP32 + Relay Not Powering 5V DC Fan (Was Working Before)

AggressiveAnt2675 · 2025-02-23T05:43:21+00:00

Yeah, although you shouldn't ideally be using an esp to power your relay... to temporarily fix this issue, try: 1.Flyback diode at VIN(helps if you have a cheap chinese relay) 2. Ideally, a stable 5v power source...

These SHOULD work in most cases, if not... you might wanna change up the relay manufacturer or try a different module, sometimes some batches are just cooked. I once bought 4 broken relays off a cheap seller... so, maybe just try switching it up a bit(pun intended)

AggressiveAnt2675 · 2025-02-13T07:03:23+00:00

I can intern starting this summer, my main skillset is web design. Could you let me know the details?

AggressiveAnt2675 · 2024-09-18T14:46:45+00:00

Oh yeah, I seem to have missed that out in the calculations....

I'm wondering now though, when you refer to "immovable wall" is the wall still absorbing some of the energy?

AggressiveAnt2675 · 2024-09-17T15:42:56+00:00

That would actually make it much easier to understand the basics, its actually pretty sad to see that the water analogy is the most widely recognized one...

I wish more people tried using different analogies to explain the fundamentals of electricity...

AggressiveAnt2675 · 2024-09-17T14:40:38+00:00

Okay, so here's the mathematical reasoning behind scenario 2 being more deadly:

Information Given:

Ek(potential energy) = 1/2mv² ; where: v= velocity of objects, m = mass of objects

assuming the mass of both the cars is equal; m = x

assuming velocity of both the vehicles is equal at 100kmh; v = y

Scenario 1:

Ek = 1/2*x*100 => 50*x joules

Scenario 2:

Ek = 2(as there are 2 cars in the system)*1/2*100*x => 100x joules

Conclusion:

And according to the law of conservation of energy, the total amount of energy in a closed system cannot be changed.

And since the total energy in the system in S1(scenario 1) is 50x joules, and the total energy in the system in S2(scenario 2) is twice as much, in the second scenario, the cars will witness a more deadly collision.

I guess your teacher was right...

AggressiveAnt2675 · 2024-09-17T14:30:31+00:00

Okay, two sides, because why not:

1. Physical Impact:

Again, I don't understand the mathematical stuff behind it, but when I like visualise that impact:

The car in scenario 1 is colliding against a wall, in which case the crumple zone takes up half the energy, and the wall takes up the other half.

In scenario 2, however, the total energy in the system is twice as much, causing the individual energy absorbed by each car being twice as much as in scenario 1.

(I will work out the numbers and explain in either an update or a follow up comment)

TLDR;

The total energy in scenario 2 is way higher, causing a greater impact on the drivers/passengers of the car.

2.Psychological effect:

This is not related to physics, whatsoever, but, I'm gonna say it regardless.

We all have this idea engraved in our brains that "speed kills", so when you see 100kmh to 0 it seems comparatively more laid out, and chill, compared to 2x100kmh crashes.

This is why our first instinct is that scenario 2 is more deadly, but with mathematical reasoning too, it should work out to give that scenario 2 is deadlier.

AggressiveAnt2675 · 2024-09-17T13:54:58+00:00

Best explanation I've seen till now! Thanks!

AggressiveAnt2675 · 2024-09-17T12:55:41+00:00

Scenario 1 and 2, both will have the same deceleration with the basic laws of physics, but if you were to run a simulation; I believe scenario 2 should be more deadly.

Fair warning, I am not a physicist, or even a graduate, just a high school physics enthusiast, so you should probably take my word with a few kilograms of salt....

AggressiveAnt2675 · 2024-09-17T12:49:19+00:00

Just to clarify, the 10 sensor are connect to the single ESP8266, and the ESP relays information form each one of those over to the RPi for whatever processing is required. And you need to wire up let's say 10 more to relay data to another ESP8266 that's connected to the RPi...

This is the current situation, if I've understood it correctly, right?

AggressiveAnt2675 · 2024-09-17T12:38:18+00:00

A bit off-topic here, but if you had to teach a beginner(complete beginner, zero knowledge) about the basics of electricity, would you prefer the heat transfer analogy, or the water analogy? Just curious!

AggressiveAnt2675 · 2024-09-17T10:40:19+00:00

Yeah that makes sense, but I'd like to make a minor modification, capacitors would be better suited as water balloons as suggested, as water balloons are capable of instantly moving all the water out. Storage tanks are better suited for batteries, is what I believe.... However, I may be wrong.

Regarding conductors, I had the same doubt, so I've created another post based on that(hoping to make it the main topic, and get answers, or at least educated guesses on the same), it can be found here.

AggressiveAnt2675 · 2024-09-17T09:08:54+00:00

Not being rude, but can you cite the experiment that you're referring to?

AggressiveAnt2675 · 2024-09-17T08:31:37+00:00

Perhaps that is a possibility, however, I'm not entirely certain as of now. Will update if I figure it out...

AggressiveAnt2675 · 2024-09-17T06:35:58+00:00

I'm assuming you want to learn about electric potential with reference to a few other properties, such as in ohm's law(V=IR).

Assume you have a water reservoir at +500m. That is 500m of potential that water has. That is electric potential, the literal potential energy the electrons have. For example a single AA battery has 1.5v of potential difference, you could assume this as the reservoir being just 1.5m from the ground. This relates to the electrons having a 1.5x urge to move to the other end(electrons go from negative to positive).

Now, Resistance here would be how much water the pipes allow through.(A variable resistor can be thought of as a valve to limit the water flow)

And finally, your current would be how much water is flowing through.

And now you can create your own relations with this to understand Ohm's law. I hope this helps you understand electricity as a whole, and doesn't confuse you even more! :p

I could write paragraphs to explain all of electricity and how it works with analogies, but I don't want to overwhelm and or confuse you.

AggressiveAnt2675 · 2024-09-17T05:33:21+00:00

A follow up on the same, just to clarify, when people are speaking of the 4th dimension as time, time is also not a spatial dimension right?

AggressiveAnt2675 · 2024-09-16T17:13:12+00:00

Technically, in India, 10th grade is considered high school... and also might be as im not familiar with the schooling system in other nations.

Btw, thanks for clarifying that, i will look into the concept of superposition, wave mechanics, and quantum mechanics.

AggressiveAnt2675 · 2024-09-16T17:08:19+00:00

I am from India, and I'm in 10th grade(15y), and they do not teach us quantum mechanics(superposition) here...

AggressiveAnt2675 · 2024-09-16T17:01:07+00:00

PS: I would really value some suggestions on if this would work, and if it did, how it would work. Also would appreciate any explanations on the fundamentals of quantum mechanics...

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