I will show you how control a motor's speed with one transistor and a personal PWM signal.
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In this tutorial, I will show you how to install the dark theme for your Arduino IDE for the reason of overexposure to the screen light.
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Ok, you can calculate the necessary resistance in this way:
In this case for a current around 10mA you need: (5V-3.25)V/10mA=175 ohm, You should use a resistor around this value.
Obviously 5V is the supply voltage.
Hi you can use 220 ohm resistors so you will have a current around 13mA, I think it is enough. If you want you can use also 330 ohm resistors so you will have a current around 8mA.
You can choose one of it considering the best quantity of light for you.
Hi, you can solve this problem with the technique of multiplexer, you can divide the image in some frames each frame is easier than the entire image and the combination of all frames create the image. In this way you can use less LEDs at the same time and the IC can provide the necessary current.
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