MicroPython Forum (Archive)

Maybe the API for these addressable needs to be moved to the correct hardware class for the port becuase they are so hardware related e.g Good question... I can see good reasons for both approaches. Would you be interested in writing up your findings on that PR I linked to before (it's still not me...

This is what I found so far with these addressable LEDS. You have to supply the LEDs with 5v but once you get correct timing then they are happy with 3.3v signals on the data pin. Yup, this has been my finding too. This is also temperature dependent -- I noticed that a micro:bit neopixel board (htt...

One difficulty with timers though is that now the API becomes a bit more complicated because it doesn't just work on any pin. So coming up with a Python API might have some challenges, but definitely not impossible. This is the same reason why defining a machine.PWM API for stm32 is tricky. Maybe t...

I would be interested to know if once you got the correct timings do you still need the voltage level shifter or will it work fine running the data pin at 3.3v No you will not need a voltage level shifter, but you have to connect you voltage supply to the VIN Pin which will supply 5V to your LED st...

i made the led works, so i had a timing problems with the code. all i did is follow this code and changed the timing to one that worked with my LED. Thank you for the help here is the code i followed and all you need to change is line 13 to 16 and 24: https://gist.github.com/nevercast/9c48505cc6c56...

One difficulty with timers though is that now the API becomes a bit more complicated because it doesn't just work on any pin. So coming up with a Python API might have some challenges, but definitely not impossible. This is the same reason why defining a machine.PWM API for stm32 is tricky. I think...

I have neopixels driving very well using timers and interrupts. That's cool! Neopixel support for STM32 is a long outstanding item for MicroPython. But I think the OP was using ESP32? Also FYI you may be interested in https://github.com/micropython/micropython/pull/5318 (which adds an STM32 driver ...

A quick google of micropython RMT neopixel yeilded this https://gist.github.com/nevercast/9c485 ... 4a22062795

It declares the timing at the top as constants but could easily be modified to accept timing parameters to be passed to it.

Ok 2 things

1. if you use CONST() for the values of the registers then it doesn't use ram, it works much like the #define in C

2. there is a viper mode that will run much faster than using the machine.mem8[] function

Now here is my question. I understand how the length of the timing of both the high and low will govern whether a 1 or 0 is sent. Iam wondering if the same method I use for generating stepper motor pulses might be able to be used for generating the pulses for the NeoPixels. i.e you use a timer and ...