I can’t get my setup to work, only the first quarter of my led strip lightens up with random blinking and random colors, rest of strip stays off.
It’s a 128 led HD107S (21+20+46+20+24) driven by a lolin32 and a relay. Lolin is powered by micro usb and led strip uses 5V15A supply.
Board+relay+strip share the same ground. Clock and data are 20cm length.
When set to power I measure ~~5V at each corner. From board to first strip solder I measure ~~0 ohms on data and clock line. No short between +5/data/clock/gnd at each corner.
First led segment starts with the led paired with resistor.
Trying to solve this issue I’ve replaced everything with brand new, except relay and led strip #2,3,4 and 5.
I triple checked pins are correct: clock on 0, data on 2, relay on 12, relay power on 3V and gnd on gnd.
Here’s WLED setup:
Of course WLED is set to solid warm white.
Note if I change total led count to eg 130, then switch on/off through WLED, the whole led strip enlightens with random flicker.
Unplugging/replugging board from usb returns to previous state of first quarter enlightened.
Weirdly rebooting this way also reset WLED power switch to on.
I’m totally lost with this issue and don’t understand where’s the fail.
Help will be greatly appreciated !
Thank you !
PS: 2 aside questions:
- is it mandatory to start the strip with the led paired with resistors ?
- is there a way to check with a multimeter that data and clock are ok along the strip the same way you can check gnd and +5 continuity and voltage ?