Papyr is a Nordic nRF52840 based Bluetooth/802.15.4 ePaper Display

Electronut Labs has designed a Nordic Semi nRF52840 boards featuring a black, red, and white e-Paper display. Papyr board supports both Bluetooth LE (BLE5, BLE Mesh) and 802.15.4 (Thread, Zigbee) connectivity, and can be controlled via an Android app, with iOS support coming later on.

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Papyr hardware specifications:

  • Wireless Module – Raytac MDBT50 module with Nordic nRF52840 BLE/802.15.4 SoC (as used in Raytac MDBT50Q-RX Bluetooth 5 LE USB adapter)
  • Connectivity – Bluetooth 5 LE/Mesh, 802.15.4 (Thread/Zigbee), NFC (PCB antenna)
  • Display – 1.54″ 200×200 pixel red/black/white epaper display
  • USB – 1x micro USB device port
  • Expansion – Extra GPIOs via 2.54mm header
  • Debugging – SWD Programming header
  • Misc – RGB LED, push button, USB/Battery power switch
  • Power Supply – 5V via USB, or CR2477 coin cell
  • Dimensions – 65 x 35 mm

You can control the board using Electronut Labs app for Android. Three features are supported at this stage: Draw, Select image, and Transfer data over MQTT.

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Beside the board itself, the company also offers a case, a user kit adding a CR2477 battery and laser-cut case, and a developer kit – pictured above – further adding Bumpy SWD debugger and PogoProg pogo pin programmer. Documentation can be found on Electronut Labs website. The board runs Zephyr Project with the default firmware source code, and some hardware files available on Gitlab.

Eventually, the hardware will be sold on Tindie, but for now the company is taking pre-orders by email. The board goes for $39, Papyr User Kit for $48, and Papyr Dev Kit for $62.

The video below demonstrates MQTT data sent to the display using HiveMQ cloud service.

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