Closed
Description
This is related to #8158 + #7985.
I am experiencing neopixel "flicker"/noise only when Wifi is on.
Some background on my setup (same as what I described in #7985):
- a 16x16 RGB panel (256 LEDs)
- connected directly to my LOLIN D32 Pro board on GND, USB (+5V), 25 6AF0
- I'm using the firmware that @jimno built and shared in esp32/machine_bitstream.c: Replace with RMT-based driver. #7985
- no capacitors or level shifters (maybe this would help, but this setup seems to work fine in FastLED, so I'm doubtful)
- I've powered it both through USB on my computer, and by unplugging the USB connection and putting +5V over the panel's connection, which feeds back into the "USB" pin as +5V
- works fine with FastLED from what I can tell
- the current amount of flickering (which is signalled with RMT, on this firmware, I assume), is much less than what I experienced in esp32/machine_bitstream.c: Replace with RMT-based driver. #7985
- it seems to happen only in the "later" part of the panel—I haven't seen any flickering in the first 4 or 5 rows of 16 pixels
- I've tried this on different ESP32 boards (a second LOLIN D32 Pro, and a different WROOM board); same results
- I tried a different LED panel that appears to be the same hardware, and the same problem
- I've taken a short video. It's a bit hard to see, but definitely visible. The 0 pixel is on the right and the 255 pixel is on the left.
Here's the code I'm using (with various timings; all similarly flickery, but only with wifi turned on and connected to a local WLAN in boot.py):
import machine
import neopixel
np = neopixel.NeoPixel(
machine.Pin(CONFIG["DATA_PIN"]),
CONFIG["NUM_PINS"],
# timing=(350, 800, 800, 350), # , timing=(400, 850, 800, 450)
)
while True:
print("doing a round.")
for p in range(CONFIG["NUM_PINS"]):
np.fill((0, 0, 0))
np[p] = (64, 0, 0)
np.write()I changed them on my setup to a timing=(350,800,800,350) and all the flickering was gone since then.
I tried this timing on my setup, and it worked fine with wifi off, but when I turned it on, the flickering came back.