backlight | minimal bash/shell script | Script Programming library

We have an Angular application which was written for us and we're trying to figure out a specific problem (see below for my voluminous essay). Basically, it's a system where some digital input is supposed to control both the backlight and the page that's displayed. If the digital input is on, the backlight should also be on, and the app should work normally, allowing user interaction.

However, without that digital input signal, the application should give a blank page and turn off the backlight so that the user sees nothing and cannot interact with a real page in some blind fashion.

The backlight is controlled by a back end process, which also deliver information to the front end (both of these run on the same device) using Angular routing. But the decision as to what's displayed on the web page is totally under the control of the front end.

We're seeing a situation where, if the digital input is toggled off and on quickly, we sometimes get the backlight on but with a blank page and I'm wondering whether there's some sort of race condition in the delivery of event through the router.

In terms of code, we have an effect which monitors the digital input signal from the back end (not directly) that looks something like:

On loading the MTL file, the entire model is turning black. I have referred to this link and set the rbg parameters to 1 but that hasnt solved my issue.

three.js mtl loader renders black

Here is the code associated with it:

I made a little program to manage the brightness of the screen for my laptop. the problem is that when i overwrite the BRIGHTNESSCTRL variable, well, i overwrite it and the previous value is erased, so when i use the program always it sets the brightness to 20000, any help is appreciated. By the way this is my program.

I am using an Arduino 2560, NEMA23 Stepper motor with a TB6600 driver. The driver is set to 1/32 step division. The motor by default is 200 steps per revolution.

I want to input step size, number of steps and settling time. Once the loop completes the number of steps i want to return to the starting point. The plan is to take multiple images and stack them in Photoshop.

So far everything works except for the return to starting point ...some of the time. If I don't step too far, meaning a combination of step size and number of steps, the motor returns to the starting point. If I exceed "X" distance the last step continues to move forward instead of backwards. I haven't fully tested what "X" distance is.

Example: If I use 5 steps with a step size of 5000 then the code returns to the starting point. If I change the steps to 7 and keep the step size at 5000 it does not return but moves forward.

Here is the complete code:

I have a bit of a hacky setup on my laptop where I use optimus-manager to configure my screen layout at X startup based on whether an external monitor is connected or not. If it is, I only want to use the external monitor and not the laptop monitor, but because of a limitation of NVIDIA drivers, I need to leave my laptop monitor on, and just lower the backlight brightness. See my /etc/optimus-manager/xsetup-hybrid.sh for how this works (eDP-1 is my laptop screen, and HDMI-1-0 is my external monitor):

I wrote a super simple thingy for this 20x4 LCD screen and I keep on getting this whenever I Interrupt with crtl + c instead of it executing the code I've placed there. Here's the Error:

I am building a simple code that should display some data on a display(an ili9341 display hooked up to a raspberry pi4). Until now i only added text and it works fine , but i dont know how to add a little (20px*20px) image underneath the text. I tryed this but id doesnt work:

for my home project I want to create some kind of ambilight. The backlighting already works by me passing a photo into a Python program and putting the photo into a 78x42 grid and then sending each edge color to an LED light. The LEDs are located behind the TV to create a background glow.

For now, the effect is already very nice.

Now the next step:

A Raspberry-Pi with a connected RPI camera should be pointed at the TV and the edge colors should be determined and sent to the LEDs.

So that the program learns where the TV is, I have already written a program, which first creates 4 images (all white, all red, all green and all blue), sends these images to the Chromecast and displays them. From each picture a photo is made. So I have 4 photos on which the TV can be seen. Each time the TV shows only one color.

I made the pictures in red, green and blue to get a color correction later, or to calibrate the colors. But that's not what I want to talk about here.

First I want to recognize the TV. I have no experience with OpenCV. I already have the following script, but I can't get any further from here.

I'm using a 12F675 PIC and I have programmed it to make 3 LEDs flash in sequence. I want it to only do this when a particular input is NOT received. The PIC is running at 3v3 and that seems to be enough to power the chip and the LEDs when I test it. The input is from another LED on a different PCB, basically I want to detect whether it is on or off. It lights at 2v5 so that's the input into my input pin. When I test it out, turning off the 2v5 source or starting with it turned off doesn't trigger the 3 LEDs to flash. Here's my code: