[image] *My NPN in real life is E-B-C and that’s how i’ve made the circuit above, although in TinkerCad the NPN is C-B-E which I ignored for the above diagram. * [image] No i do not have ∞ resistance on that resistor. So this works. I can turn on my motor safely using my arduino + NPN combo. …

your setup cannot work as the motor has no source of electricity… my guess: your real situation is different from the fritzy…

your serial reading and serial output may take significant time. all that time your motorpin is either high or low… I suggest you use analogWrite()… or use one of the onboard timers if you want to learn how to do this without analogWrite()…

[image] randomarduino13122: Yes I know analogWrite() exists. I did not want to use it here Please explain why you don't want that. Sorry, but it is absolutely impossible to generate PWM manually while writing and reading the Serial, as in your code. Dealing with serial take a way more time t…

Why is that code posted as individual lines? It is impossible to copy. You might want to look at this How to get the best out of this forum before you proceed any further. It will tell you how to post code correctly. You need a resistor in the base of the transistor, but the actual value will de…

[image] Grumpy_Mike: Why is that code posted as individual lines? It is impossible to copy. I managed to select all the lines and then copy and paste into the IDE. Here are the results displayed on an oscilloscope, that I got when testing the code: Channel 1 - yellow trace - RX data Chann…

As for me, reducing serial timeout is only a crutch that directs code development in the wrong way...

[image] randomarduino13122: Yes I know analogWrite() exists. I did not want to use it here Without giving any justification for it, that is an unreasonable thing to say. analogWrite() is a standard Arduino function. Who wants to try to help someone who is unreasonable? It could be a waste of …

I agree with @b707 . Setting a lower timeout is not really fixing the problem. I suspect what's the problem here is the line endings setting on serial monitor. It is set to send CR and/or LF characters after the value has been entered. So what happens is that the new value is read by Serial.parseFl…

[image] Grumpy_Mike: Why is that code posted as individual lines? I saw a first example of a newbie posting code like this a few days ago. Then another example a couple of days later. Now a third example. This doesn't feel like a coincidence. Something changed on the forum? @pert do you know…

my bad, the power supply shows no value on the diagram. i am using a 9V battery –> stepped down to 5V by power supply module –> motor. it works

Manual PWM changes cause DC motor to momentarily stop

Projects General Guidance

pert August 15, 2025, 9:09am 15

Yes, see the dedicated discussion here:

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Manual PWM changes cause DC motor to momentarily stop

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