Jean-Luc Aufranc writes at CNX Software that Seeed Studio has released two Bluetooth LE e-paper kits built around the Nordic nRF52840, both shipping with the open-source OpenDisplay firmware already installed.

The OpenDisplay 4.26″ Mono Kit uses a 4.26-inch monochrome and grayscale panel at 800×480 with partial refresh. The 7.3″ Color Kit uses a 7.3-inch Spectra 6 color panel at the same resolution. Each one includes a 2,000 mAh battery, a driver board based on the XIAO nRF52840 Plus, and buttons for control and reset.

OpenDisplay is an open standard and firmware that lets any sender put images on a supported screen, local and low-power, without a cloud service in between. You flash it from a web browser and send images over BLE or WiFi using the OpenDisplay Toolbox in Chrome or Edge. Home Assistant can turn weather, temperature, energy use and calendar events into images and push them to the display.…