Partner is pregnant, ultrasound looked cool. Had an e-ink dev board collecting dust. So here we are. Pretty simple stuff, the board is an Adafruit MagTag. And all we needed to do was have a progress bar, some graphics, and some text. There are some useful guides to making a progress bar and graphics for this e-ink board HERE and HERE.
I used some wikimedia fetal development graphics for each step. The key thing is to format the image correctly for the e-ink display. This is the ImageMagick command I used to do that:
magick convert input.png -dither FloydSteinberg -define dither:diffusion-amount=0% -remap ./eink-4gray.png BMP3:output.bmpHave it sticking on the fridge right now, the battery consumption is really low, and only used when updating the progress, should be good for a year or more.
Petri Dish Talk 
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Where did you get the graphics specifically? I am having troubles finding them. (and congrats!) Obviously I’m in the same situation. 🙂
try categories like https://commons.wikimedia.org/wiki/Category:Fetal_development
Ty. Yeah I couldn’t find the specific ones that he appeared to have used on the eink display.
yea so, I start with the wikimedia image, cut it out for the individual stage, then add a thicker outline, change the contrast, color curves etc until it looks the way I like it on the e-ink screen. I had to go back and forth after applying the imagemagik command to actually see what looks good on the screen. I used procreate on iPad to edit the images but you can use whatever you like.
Thank you for the info!
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