Possible pins for driving NeoPixel with ESP32?

Posted on Thu 22nd, February 2018

• #1

n00b
I successfully drove NeoPixel matrices using MOSI pin (D13) on my dev board from: https://www.ezsbc.com/index.php/featured-products-list-home-page/wifi01-32.html#.Wo4QjxPwZTY

I'm making a clock with 4 buttons as input. Later I discovered that setWatch currently only works for D12 - D15 (using 1.95). Some pin throw error when I set setWatch (unable to setWatch) and some can be set but once button is pressed I got either crashes or turning on board LED . As I think I'll need D13 for one of the button, I'll need some alternative pin to drive the matrix.

Anybody knows if I can use other pin(s) to drive the matrix? I thought about software SPI but the code I use to write accept direct pin:
```
neopixel.write(D13, ledbuffer);
```
Thanks!
• #2

Wilberforce

The latest firmsware fixes setwatch to work on pins greater than D15, so install v1.96 can your're good to go!
• #3

n00b

Thanks! I have all the pins I need now!
• #4

Wilberforce

If you don't mind, please share you code so others can see how you have done it.

If you post the source between three back ticks ` it gets marked as code, or use the </> code bar above.
• #5

n00b

Sure! I managed to use setwatch D25, D26, and D27 on my board. For the code of what I'm making, I want to post in the Projects section, trying to squeeze time to do it. Thanks!

Post a reply
- Bold
- Italics
- Link
- Image
- List
- Quote
- code
- Preview
Formatting Help

Don't worry about formatting, just type in the text and we'll take care of making sense of it. We will auto-convert links, and if you put asterisks around words we will make them bold.

Tips:

Create headers by underlining text with ==== or ----

To *italicise* text put one asterisk each side of the word

To **bold** text put two asterisks each side of the word

Embed images by entering:
![](https://www.google.co.uk/images/srpr/logo4w.png)
That's the hard one: exclamation, square brackets and then the URL to the image in brackets.

* Create lists by starting lines with asterisks

1. Create numbered lists by starting lines with a number and a dot

> Quote text by starting lines with >

Mention another user by @username

For syntax highlighting, surround the code block with three backticks:

```
Your code goes here
```
Just like Github, a blank line must precede a code block.

If you upload more than 5 files we will display all attachments as thumbnails.

For a full reference visit the Markdown syntax.