Sending postcards to loved ones was standard procedure for travelers back when travel was glamorous and communications slow. While some travelers still carry on this tradition, many have replaced stamps and post offices with instant messaging and social media – faster and more convenient, but far less special than receiving a postcard with a handwritten message from a distant country.[Cameron] designed a postcard photo frame that aims to bring back some of that magic. It is a wooden frame that contains an electronic ink screen, which displays images sent by your friends. They just need to open the unique link you sent them beforehand and upload an interesting photo; the photo frame will cycle through submissions based on an adjustable schedule. A web interface allows you to change settings and delete inappropriate images.
The wooden frame is beautifully crafted, but the sleek black PCB inside is a true work of art. It contains a battery and a USB-C charging circuit, as well as an ESP32 that connects to WiFi, stores the images and scales them down to the 800×480 monochrome format used by the display. [Cameron] didn’t accurately measure current draw, but estimates it should run for about a year on a single charge thanks to the extremely low power requirements of e-ink displays.
Having your friends decide what pictures are displayed in your house is a neat idea, if you can trust them to keep it decent. If you want more control over your e-ink display, take a look at this solar-powered model or this wall-mounted newspaper display.