Note - could possibly have done the send and receive on the same Mega. I didn't think of it beforehand... I powered the second board from the first as I couldn't lay my hand on 2 of the Type A USB cables (though they are surely hiding somewhere) Windows terminal programs don't support 9 bit data (th...

A quick demo of 9 bit comms using 2 Arduino Megas. One is the 'sender' (S) and one a 'receiver' (R) (I called it UART) (that echoes the received data to a PC via the USB comms UART) I connected RX1 to TX1 and TX1 to RX1 on boards 'S' and 'R' - also GND (essential) and 5v as I have the sender powered...

... There is an issue - send and receive take a byte which is 8 bits, so some extra work needed..

- I might be wrong on this - looks like the functions now return an int.

A little tip to make life easier. The output from the esp32 compiler is a 'little' verbose. It is possible to turn off some of the warnings. In your project directory/main Edit CMakeLists.txt At the end of the file add: target_compile_options(${COMPONENT_LIB} PRIVATE -Wno-unused-variable) target_com...

This is some alternative code for WS2812 LEDs running on the esp32. Rather than the RMT based component (I get issues with this being deprecated...) I tried two alternatives - using the i2s hardware where I got 'reasonable' results. LEDs would set but occasional glitches ( I think the T1L time I got...

Please post your code - or a snippet showing the problem. SPI sends overwrite the sent data with values received by the sender (or 0 if there is no reply) - so you might need to just update the array values each time.. loop (forever) loop (i = 0.. 7) array[i] = val[i] send (array) delay(1s)

is the display component connected correctly?

I'm going to say 'maybe' - or I think/hope so...


Will play some more....

Looks a very neat idea. I tried with the esp32s3 board (parallel ILI9488) - and got many build errors. G:/Downloads/DisplayManagerDemo/main/esp-project.c: In function 'FCD_0fe41_gLCD_ILI9488__Initialise': G:/Downloads/DisplayManagerDemo/main/esp-project.c:2810:21: error: expected expression before '...

With a little bit of tuning - now working with a 1 metre strip (they turned out to be RGB as well) I hit a very strange effect. If if Refresh I do for a 0 bit. PORTD = ph; PORTD = pl; Then if I do the same for a 1 bit with a few nops. Then it is slower (for the 0 bit) than doing PORTD |= 0x80; PORTD...

Now tested with 2 LEDs and seems to work AOK (I have a few 'single' LEDs with nice sockets / plugs - so adding extra is easy!) - which bodes well for multiple.
I think I have a 1m of these somewhere (RGBW) - which I will try and find to test further.

Martin