I'm trying to run a neopixel strip and an arduino from the same power supply using a voltage divider to get 5V to the strip.
Here are the values for my voltage divider:
R1 = 1500 Ω
R2 = 1000 Ω
Vin = 12 V
Vout = Vin*(R2/(R1+R2)) = 12*(1000/(1500+1000)) = 12*(1000/2500) = 12*0.4 = 4.8
When the divider is connected at its inputs but not at its outputs, I measure the expected 4.8V across R2. But as soon as I connect the neopixels, I only get about 1.6V.
Could anybody explain this || Suggest a possible solution?