E-Paper Badge with Teensy LC designed in KiCad

E-Paper badge designed in KiCad to connect Pervasive Displays 2.15" E-Paper to Teensy LC. (Teensy 3.2 is also compatible). Based Teensy E-Paper Shield by Jarek Lupinski in EAGLE.

OSH Park shared project

• KiCad Teensy E-Paper Badge

KiCad PCB design files

• repo: kicad-teensy-epaper
• commit: add JST connector for lipo battery [abcafec]
• requires KiCad library wickerlib by Jenner Hanni of Wickerbox Electronics for the 34-position FPC connector that the e-paper display plugs into:
  • CONN-HEADER-FH34SRJ-34S-0.5SH.kicad_mod

Bill of Materials (BoM)

• OSH Stencils: stainless steel stencil
• Teensy LC sold by OSH Park. Designed and manufactured by PJRC.
  • Teensy 3.2 is also compatible but more expensive
• Pervasive Displays 2.15" e-paper with ITC
  • Mfg part number: E2215CS062
  • Digi-Key: E2215CS062-ND
  • Datasheet: 2.15" TFT EPD Panel (E2215CS062)
  • App note: 2.15" Aurora_Mb Application Note
• Hirose FH34SRJ-34S-0.5SH FPC connector
  • Mfg part number: FH34SRJ-34S-0.5SH(99)
  • Digi-Key: H124726CT-ND
  • Datasheet: FH34(S) Series Datasheet
• JST connector for LiPo battery
  • Mfg part number: S2B-PH-SM4-TB(LF)(SN)
  • Digikey: 455-1749-1-ND (CONN HEADER PH SIDE 2POS 2MM SMD)
  • Datasheet: JST PH connector
• Teensy headers
  • Digikey: S7012-ND (CONN HEADER FEMALE 14POS.1" TIN)
  • optional as Teensy can be soldered directly to PCB
• Capacitor 1uF 0805 (quantity 9)
  • Digi-Key: 1276-1066-1-ND (CAP CER 1UF 25V X7R 0805)
  • Reference: C1 C3 C4 C5 C6 C7 C8 C9 C10
  • Note: it is cheaper to purhcase qty 10
• Capacitor 2.2uF 0805
  • Digi-Key: 1276-2953-1-ND (CAP CER 2.2UF 25V X7R 0805)
  • Reference: C2
• Inductor 47uH
  • Digi-Key: 732-7252-1-ND (FIXED IND 47UH 800MA 521 MOHM)
  • Reference: L1
• Mosfet N-Ch SOT23
  • Digi-Key: 785-1012-1-ND (MOSFET N-CH 30V 3.8A SOT23)
  • Reference: Q1
• Resistor 2.2 Ohm 0805
  • Digi-Key: 311-2.20CRCT-ND (RES SMD 2.2 OHM 1% 1/8W 0805)
  • Reference: R1
• Schotty diodes SOD123 (quantity 3)
  • Digi-Key: MBR0530CT-ND (DIODE SCHOTTKY 30V 500MA SOD123)
  • Reference: D1 D2 D3

Digi-Key shopping cart

Battery Power

• WARNING: The trace between VIN and VUSB must be cut!
  • Demostration of cutting the trace on Adafruit Learning System.
• Lithium Ion Polymer Battery - 3.7v 500mAh from Adafruit
  • capacity chosen for a good trade off between weight and power
  • TODO: measure how long board will run with different capacities.

Source Code

• uses EPD215 Arduino Library by Jarek Lupinski for his E-paper Teensy Shield
• requires pinout modification:
  • example: bringahackmfba17-dorkbotpdx.ino
  • EPD215 epaper( 17, 16, 14, 15, 13, 11 );
• rotation hack in EPD215.cpp
  • text and graphics wil be upside down without this
  • quick hack to set rotation based on Adafruit documentation:
  • Landscape mode:
    • _rotation = 1
  • Portrait mode:
    • _rotation = 2
  • I don't use this for the examples program that just display bitmaps as I just flip the image before generating the byte array from the bitmap file

TODO: library should be modified to accept rotation parameter

Photos

• Google Photos gallery
• images directory in github repo

Video

• YouTube: E-Paper Badge with Teensy LC designed in KiCad

Related: Jarek's ePaper Teensy shield

• OSH Park shared project: Teensy e-Paper shield
• My repo of Jarek's design files: TeensyEpaperShield