I'm trying to power a project where I have 14 red led's lighting fiber cables controlled by an arduino nano. I want to make them pulse at maximum brightness to resemble veins.

I have the LED's set up in parallel, each with a resistor. Due to time constraints, I used 470 ohm resistors that came with some other led's I bought (to avoid ordering more). I realize now this was dumb, and I can no longer use the Arduino PWM to fade up to maximum brightness.

I understand that I will probably have to use a transistor to make it fade.

I could really use help with the following:

• math help calculating the voltage and current parameters that would make the LEDs shine bright while also being convenient to power with common battery types.
• What kind of battery to use
• what transistor to buy, and the best technique to use to fade the LEDs

Here is the datasheet for the LEDs

Current - 20 mA max
Forward voltage = 2.0 to 2.4 Volt

I'm trying to power a project where I have 14 red LEDs lighting fiber cables controlled by an Arduino Nano. I want to make them pulse at maximum brightness to resemble veins.

I have the LEDs set up in parallel, each with a resistor. Due to time constraints, I used 470 ohm resistors that came with some other LEDs I bought (to avoid ordering more.) I realize now this was dumb, and I can no longer use the Arduino PWM to fade up to maximum brightness.

I understand that I will probably have to use a transistor to make it fade.

I could really use help with the following:

• Math help calculating the voltage and current parameters that would make the LEDs shine bright while also being convenient to power with common battery types.
• What kind of battery to use.
• What transistor to buy, and the best technique to use to fade the LEDs.

Here is the datasheet for the LEDs.

• Current - 20 mA max
• Forward voltage = 2.0 to 2.4 Volt

I'm trying to power this project where I have a series of 14 red led's lighting fiber cables controlled by an arduino nano. I want to make them pulse at maximum brightness to resemble veins.

I have the LED's set up in parallel, each with a resistor. Due to time constraints, I used 470 ohm resistors that came with some other led's I bought (to avoid ordering more). I realize now this was dumb, and I can no longer use the Arduino PWM to fade up to maximum brightness.

I understand that I will probably have to use a transistor to make it fade.

I could really use help with the following:

• math help calculating the voltage and current parameters that would make the LEDs shine bright while also being convenient to power with common battery types.
• What kind of battery to use
• what transistor to buy, and the best technique to use to fade the LEDs

Here is the datasheet for the leds

I'm trying to power a project where I have 14 red led's lighting fiber cables controlled by an arduino nano. I want to make them pulse at maximum brightness to resemble veins.

I have the LED's set up in parallel, each with a resistor. Due to time constraints, I used 470 ohm resistors that came with some other led's I bought (to avoid ordering more). I realize now this was dumb, and I can no longer use the Arduino PWM to fade up to maximum brightness.

I understand that I will probably have to use a transistor to make it fade.

I could really use help with the following:

• math help calculating the voltage and current parameters that would make the LEDs shine bright while also being convenient to power with common battery types.
• What kind of battery to use
• what transistor to buy, and the best technique to use to fade the LEDs

Here is the datasheet for the LEDs

Current - 20 mA max
Forward voltage = 2.0 to 2.4 Volt