03-03-2019, 03:54 AM
If you have an Arduino such as Uno or Mega 2560 that puts out 5v on PWM pins you can test it. Here's a nice voltage divider calculator, add the input and desired output, then change Resistor Sequence to E24 and set the Resistor Scale (Ohms) to 1000 so you get ohms.
For your 1.8v max you would need R1 = 11k, R2 = 6.2k.
Under the calculator is a diagram showing how to wire in the resistors, you need to do this to each LED channel or pin from Arduino you use.
http://www.ti.com/download/kbase/volt/volt_div3.htm
For your 1.8v max you would need R1 = 11k, R2 = 6.2k.
Under the calculator is a diagram showing how to wire in the resistors, you need to do this to each LED channel or pin from Arduino you use.
http://www.ti.com/download/kbase/volt/volt_div3.htm
