The voltage versus current characteristics of an LED are much like any diode. Current is approximately an exponential function of voltage (see Shockley diode equation), so a small voltage change results in a large change in current. If the voltage is below the threshold or on-voltage no current will flow.
led's look like infinite resistance to a point, after that they "open up"
and dont connect a motor direct to the arduino, thats bad mk? (high currents, back emf = damage)
No, please stop damaging your arduino. You need a resistor in seriese with the LED, and you need more than a 0 ohm resistor with the motor.To drive a motor you need a transistor. Getting more than 40mA from a pin will damage it.
My motor is: 13.10mA and i am not sure about ideal voltage for it and how much RPM is it. Actually i have tested it by myself with use of multimeter with 1.5 AA battery
how to find out required transistor
My arduino is UNO (and have another mini pro) it has 3.22v output i have done short test with it ]So my motor is 3.22v and 16.1mAI need 200ohm resistor exactly (0.01% tolerance
Now about transistor, i have read about it as it is stable output regulator regarding to middle pin input.
Actually i don`t have any transistors now, but i will get some nearly, or i will grab into some old home electronics $)
Do we need transistor to prevent interchangeness of amperage by motor? because if i block motor rotation the amperage increases up to 140mA. I have read about transistors but there are were not any equation or any rule for it, just explanation. can ou forward me to right direction to understand transistors.
One more question, you said 2n2222 transistor which resistance is included, and it is 10k so do i need to subtract this resistance and get ohm for separate resistor regarding to transistor`s internal resistor? do all transistors has resistor inside or it is just resistance of transistor itself?
can ou forward me to right direction to understand transistors.
i have read about it as it is stable output regulator regarding to middle pin input.
you said 2n2222 transistor which resistance is included,
I need 200ohm resistor exactly (0.01% tolerance)
Do we need transistor to prevent interchangeness of amperage by motor?