I have a couple questions about a project I am working on with an Inky Impression screen and a RPi4.
I am working on a Raspberry Pi project that involves a continuous a slideshow of images on the Inky display. The images display for between 1 to 5 seconds before continuing to the next image so the majority of the time it is in the refreshing state. Every 5th image I clear the screen so that it wont damage the screen and cause ghosting or fading.
I have been writing Python code to display the images, and plan to install the Pi in a self-contained sculpture that will be wall-mounted and exhibited as part of an exhibition. I want to have zero cables coming out of the sculpture during the time that the gallery is open.
I was thinking of powering the Pi with an internal battery that can be charged without having to turn off the Pi or open up the sculpture each day. So the Pi will be always on. To achieve this, I plan to use a battery power bank with “pass-through charging” so that the Pi can stay connected and be powered by the battery while it is charging overnight.
Because I will be powering it over a power bank I am really concerned about the battery dying and then the Pi becoming corrupted. With all the GPIO pins taken I cant work out how I could set up a safe shutdown and power up switch.
I was thinking of also putting a timer on the script so that it pauses during the night when the exhibition is closed, in order to not overly stress the inky screen.
Happy to share the script I have written with the help of ChatGPT if it would be useful to see too.
-Firstly, do you see any glaring problems with the proposal, this is my first Pi project so I am learning a lot of new things and am not sure if something I am doing is very wrong.
-Can I change the hardware script to speed up the rate of refresh, like overclocking it somehow? I ask because I had the script running from launch once and accidentally opened a new script and it did this really interesting partial refreshing where it didn’t completely load any of the images in the slide show but kind of flicked between the pulsing purple images.
-How much power does the screen actually draw? I understand it says it is ultra low power but I am trying to decide on the capacity of the power bank battery I will buy to fit internally and I am hoping that something like a 10,000 will sufficiently last each day between charges.
-Another concern is the temperature. I read that pass through charging batteries can get a lot hotter when being powered. All the electronics for this project will be incased in a seating foam so I am wondering how hot things are going to get as I don’t see any way I can get better ventilation into the sculpture.
-Has anyone got experience about putting such stress on the screen? The exhibition will last 3 weeks and be open 7 hours a day which seems like a lot of stress for it to be refreshing continuously for that time.
-What is the optimal number of images that I can show before I should clear the screen to avoid ghosting or permanent damage? Ideally I would have this happening more infrequently like every 10 images but I would rather be safe.
Thank you to any and all answers! Appreciate the feedback and help on this!