Servo motor control without microcontroller | 555 as servo controller

[@perogieeater]

You are a great instructor. Very clear explanations and nice pace for the tutorial. Thank you.

[@vilasnatalkar4223]

What is the use of R2 because no current is going through it

[@Marc-mp6lf]

Will voltage source affect the calculation?

[@JasonRobards2]

Great job! So if I'm correct, the total period of 20ms that is stated on the SG90 datasheet does not play a role, only the t(on).

[@EEWave]

That is correct but total time period should not be very large. I think they are saying maximum time period should be ~20ms. (I'm not sure about that)

[@bitcodelabs4660]

I'm using a 10k ohm potentiometer but it doesn't work with this type of potentiometer, does it only work with 100k?

[@ratsrc]

what is d use of diodes

[@almaskhan5387]

Can we use led instead of doid

[@ravipatel8636]

Which diodes are used???

[@candrasniper3404]

Why does the servo shake sir at 90 degree and more, when we turn slowly the potentiometer? 100k made it shake too much and i used 50k. But the shaking trouble related over 90 degree, still existed. The circuit is on the breadboard as same as what you do in this video.

[@israelalmaraz7889]

what's the diode you used*

[@EEWave]

It is 1N4007

[@israelalmaraz7889]

Brooo,what's de diode you used?

[@EEWave]

These are 1N4007

[@israelalmaraz7889]

@@EEWave thaaaanks

[@mohmmedalagily4610]

Nice explanation, congrats

[@ratsrc]

my servo is vibrating...while rotating

[@froggyfriday8975]

Can variable current or voltage change servo position? If yes then explain how

[@alf3071]

did you find out? I'm asking the same thing

[@dianpurwatorodoyonoto400]

Great job my friend. Actualy i need to substitute the potensio in to toggle switch and need a stable posisition. Is it possible by using this circuit to do it?

[@EEWave]

Hello friend, yes it is possible. Just remove the potentiometer and put resistors. If you need 2 stable position then you have to put 2 resistors. (For 3 stable position, you need 3 resistor and so on..) Find the value of the resistor with the help of potentiometer.

[@alanjacob4948]

@@EEWave can u tell how to connect 2 resistor , i mean in between which of components please help.

[@ravipatel8636]

How much power supply you applied to circuit?

[@kevinsono]

His schematic said 5V at 0:38

[@subhabratabasu266]

Can I drive a servo motor using analog pin of arduino? Please help me

[@EEWave]

Yes, you can run a servo using analog pins like A0 to A5.

[@subhabratabasu266]

@@EEWave can you please give me any link of this where I can find the further details of it. Please

[@almaskhan5387]

No you idiot

[@AnakKosanLife]

Is there anyone can explain me where "0.693" come from?

[@atmega3212]

Only what i can say about, this is result of narural logarithm from 2 ln(2) = ~0.693. I am still begginer and at this moment I don't know why Natural logarithms are commonly used in electronic calculations...

[@sergiopascareli7207]

This value and formulas for T(on) and T(off) are given in the 555 data sheet.

[@filippogreco6008]

The voltage on a capacitor has an exponential grow that can be expressed in this way Vc(t)=Vinf+(V0-Vinf)e^(-t/R*C). If we give 6V to the ne555 timer it will make two treshold voltages at 2V a 4V. (If we give 12V it will create two tresholds at 4V and 8V). The capacitor will the oscillate between these two thresholds again and again, from the lowest one to the highest one in that exponential way. So if we substitute: Vinf=6V (because the capacitor will try to aim to reach 6V), V0=2V (the voltage at time 0), Vc=4V (the voltage at time t) we can than calculate what is going to be the time t needed to reach 4V from 2V. 4=6+(2-6)e^(-t/RC) (4-6)/(2-6)=e^(-t/RC) 1/2=e^(-t/RC) ln(1/2)=-t/RC -t=ln(1/2)*RC t=ln(2)*RC=0.69*RC When the capacitor is charging the output of the ne555 timer will be high, that means that the time that the capacitor takes to charge is the Ton time of the ne555 timer.

[@crispat7225]

Brooooo, im so grateful with you!.

[@EEWave]

Glad to hear that

[@pranav_2229]

Great job broooo

[@EEWave]

Thank you my friend.

[@gregdoswalt]

Thank you great job!

[@israelalmaraz7889]

Nice

[@EEWave]

Thanks

[@husodaroo2959]

ur amarzing!