redshift VS SunriseLight

Redshift has code to calculate that locally which I use in my sunrise light project

FWIW, Linux Mint XFCE comes with Redshift.

Other options include f.lux and redshift.

There is Redshift: https://github.com/jonls/redshift

eg for this project my available inputs were intermittent 12v power, bluetooth, and the current time and location; and the desired output was 3× high current low-side switches that produced 12v RGB PWM corresponding to the colour temperature and brightness of the sky - so we need a bluetooth microcontroller, battery backup to keep time when 12v is absent, some battery management which wanted 5v in, a 12v buck to feed it, some MOSFETs, and redshift or similar code to plug into things.

I just added redshift as a submodule to handle the GPS location + UTC time to color temperature conversion.

But I still use redshift and prefer it over f.lux. I am on cell and this is first result so double check https://github.com/jonls/redshift

Anyway, for dimming screens with overlays (or gamma alteration), Redshift seems to have a -b option.

The instructions are super confusing to me. Here's the github :https://github.com/jonls/redshift

Redshift has code to calculate that locally which I use in my sunrise light project

Since then I've made lots of things like audio amplifiers and effects, motor controllers, 3d printer controllers and firmware (and subsequently smoothieboard), muscle stimulators, bluetooth LED strip controllers, etc

Here's a bluetooth RGB strip controller I made a couple years ago if you want an example.

hackaday.com has a zillion links to examples; here's one two three four of mine and I've also got a laundry list of companies I've helped but whose technical details I can't legally publish (note that I've assisted many but not all of the companies in that link)

eg for this project my available inputs were intermittent 12v power, bluetooth, and the current time and location; and the desired output was 3× high current low-side switches that produced 12v RGB PWM corresponding to the colour temperature and brightness of the sky - so we need a bluetooth microcontroller, battery backup to keep time when 12v is absent, some battery management which wanted 5v in, a 12v buck to feed it, some MOSFETs, and redshift or similar code to plug into things.

Here's one I made earlier although it targets NRF52 and doesn't use Arduino libraries.

I've got a similar project here, and most of the complication is for battery management - the actual LED strip drive is even simpler than yours because I chose MOSFETs that work nicely with 3v3 gate voltage :P

If you're curious here's a couple of my AVR projects (not using Arduino libraries at all), and here's an NRF52 one

I guess my Sunrise Light project could have been built on Arduino's libraries since an NRF52 core exists, but I didn't do that…

For example, this old project of mine uses an NRF52832 (which is substantially similar to the '840, just missing USB) and it offers several services and characteristics including a battery level service, a DFU service, and a custom service for actually controlling it.