I have a VB App which will control what led lights to turn on temporarily. Arduino UNO R3 will stay hooked up to PC via USB the entire time.
2 LED strips will be powered by 5v 4A power supplies
So I found this sketch from another users post. If I have Arduino hooked up via USB, I should not hook up 5v and ground from the power supply right??
Do I need the capacitor?? Do I need the resistor?? If I hook up like the diagram, and leave out the parts I have scribbled, should I be OK??
TIA
The resistor and capacitor are "recommended". It will probably work without them but your odds are better with them.
I've usually seen a 100 Ohm resistor recommended but 470 should be OK. The data input on the LED strips is very high impedance so virtually no current flows and there is virtually no voltage drop across the resistor. If the resistance is way too high the LED strips will be more prone to noise pickup and you might get "capacitive" effects.
Adafruit does recommend applying power about every meter so if you get dimming or flakey operation at the far-end, apply power to both ends.
GND of the Arduino must be connected to the GND of the strip ... Otherwise the signal might be floating ...
Do you agree?
Thanks for the feedback. Here's my horribly drawn sketch. My question is does the 5V and GND from the R3 need to be hooked to anything, and do the wires with question marks on them need to hook to anything.
Do not connect the R3 5V(red wire scribbled). DO connect the R3 GND (black wire scribbled). The signal from the Arduino MUST have a ground in common with the power to the strips.
For clarity, since you have two power supplies for the strips, be sure to connect the GND of both those power supplies to the Arduino GND.
Are you sure you have WS2818B and WS2812B led stripes? They usually have three lines:
E.g.:
P.S.: If we have a close-up at your picture from post 4 it looks ok
You have to find out which of the lines are connected to GND, +5V and DIN/DO on the strip ...
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