Adafruit M4 Grand central board NeoPixel

Projects Programming
1

Hello I'm trying to program the M4 Grand Central board by adafruit. I was wondering if anyone know of a way to program the neopixel? I have tried pin 88 as I'm seeing on adafruit site that does not work. I have tried lots of pins so far no luck. Can someone please help me out. I do have the adafruit neopixel library already installed?

Joseph

2

Adafruit Grand Central M4: https://www.adafruit.com/product/4064.
That is a SAMD51 processor (Cortex M4 at 120 MHz) on a pcb board with the size of the Arduino Mega 2560.

The NeoPixel library seems to work with the SAMD51.
What kind of ledstrip do you use ? Can you give a link to where you bought it ?
How did you connect the ledstrip and how do you power it ?
Do you use the newest versions for the board and the libraries ?

Some ledstrips require a 5V signal. Some ledstrips have 4 colors instead of 3. Some ledstrips require a truckload of current.

3

Hello the neopixel is on the board it's self. I even tried to do a standard led link on 13 and got nothing from it. I did do a analog value read on A0 and that worked. But i can not get nothing else to work.

Joseph

4

That is weird. Can you put aside the NeoPixels for the moment ? You need to get a pin working with digitalWrite().

I think you should ask it at the Adafruit forum, or maybe someone else on this forum knows what to do.

5

I'm sorry let me rephrase that I was putting in D13 just for a led blink and that didn't work so i tookout the D and just put 13 that did work. It's just the neopixel that I'm having this problem with.

Joseph

6

So everything is working, but the NeoPixel not.

The NeoPixel library is made to work with that board. You can see here the specific code for the SAMD51: "#elif defined (SAMD51) // M4".

I can not find Issues on Github for the SAMD51.

Can you show your sketch ?

7

Adafruit publishes a schematic:

It says that the NeoPixel is a normal WS2812B
However it is powered with 3.3V. If I remember it correctly, the minimum voltage is 3.6V.
The NEOPIX signal is connected to PORTC, PC24, that should be Arduino pin 88. So yeah, it is 88, I can not make something else out of it.

#define PIN 88
#define NUMPIXELS 1
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

It seems to be dedicated for CircuitPython. I don't know if it is blocked when using the Arduino code.
I tried to find someone who is using that NeoPixel, but I can't find it. You might be the only one :astonished:

This seems to be a specific problem. I don't know what else to say. You have to ask at the Adafruit forum.

8

Hello thank you very much. I tried to define pin 88 but it didn't work. With this information i was able to program it thank you.

Edit: Yes i had to use python to program it. I couldn't do it with arduino IDE. It is a shame.

Joseph

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