Wi-Fi Connected E-Ink Display

People implementing the Scrum Methodology for project management often record all their tasks on a big whiteboard. However, it’s useful to have up-to-date graphs to ensure projects are on track. [Sprite_TM] augmented the whiteboard by building an Wi-Fi connected E-Ink Display.

Interfacing with E-Ink displays isn’t easy. A variety of voltages are needed, and the connectors used are tiny. We’ve seen some nice solutions, such as the RePaper display. [Sprite_TM] chose the ED060SC4 display which is available from eBay and has been throughly reverse engineered. A custom breakout board was built up to connect to the tiny FPC pins and generate the required voltages using the LT1945 DC/DC converter.

The next step was adding on Wi-Fi. The ESP12 module was an obvious solution. This module provides Wi-Fi connectivity and a processor capable of controlling the display. The display is powered by a tablet battery, which makes it totally wireless and operates for about 200 days.

A simple laser cut enclosure holds all the bits together, and contains magnets that stick the screen to the whiteboard. On the software side, images are streamed to the ESP12’s processor and loaded directly to the screen, since the ESP12 doesn’t have enough RAM to store an entire screen worth of data. All the firmware can had by cloning a Git repository.

From ePaper Badge to Weather Station

ePaper Weather Station

[Jeremy Blum] converted his 2013 Open Hardware Summit badge, also known as the BADGEr, into an ePaper weather station. We’ve looked at the 2013 OHS badge in the past, and the included open source RePaper display makes it an interesting platform to hack.

To fetch weather data, the badge is connected to a Raspberry Pi using an FTDI cable. A Python script uses the Python Weather API to poll for weather data. It then sends a series of commands to the BADGEr using pySerial which selects the correct image, and inserts the current weather data. Finally, a cronjob is used to run the script periodically, providing regular weather updates.

If you happen to have one of the badges, [Jeremy] has provided all of the files you’ll need to build your own weather station on Github. Otherwise, you can take a look at the RePaper project and WyoLum’s eReader Arduino Library to build your own ePaper project.