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These LEDs can be made with any LED that needs less than 5 volts to operate and they are really useful when you want to add an LED ...
for this project you will need; - Any LED that needs less than 5 Volts. - The correct resistor for that LED. You can easily calculate it here.
first, you need to trim the ground LED's lead, then you need to trim one of the Resistor's leads and attach it to the LED, finally, trim the ...
to test it, simply download the code "test_arduino_LED.zip" and upload it to your arduino board, then connect the LEDs into pins 8 and 9 and 11 and 12.
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