vasy_skral / Smart Button with E-Ink display

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Running Python 3 Donut Display

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Work completed
  • Updated project description with Raspberry Pi integration notes and USB-C serial usage.
  • Refreshed the System Architecture diagram in the project property.
  • Added Raspberry Pi Zero 2 W 40-pin header as J_PIZERO.
  • Placed USB-C receptacle (Molex 2024100002) as J_USB_C.
  • Added CC pull-downs R2 and R4.
  • Placed bidirectional TVS diodes on D+ and D– as D1 and D2.
  • Added input protection fuse F1.
  • Inserted 5 V buck regulator U2 (LMR50410Y5FQDBVRQ1) with passives C3, C4, L1.
  • Added 3.3 V LDO U3 (AMS1117-3.3) with decoupling C2.
  • Maintained original ESP32↔E-Ink nets without alteration.
  • Created UART link with 47 Ω series resistors R6 and R7 between Pi GPIO14/15 and ESP32 TX/RX.
  • Repurposed SW1:2 through pull-up R1 to Pi GPIO17; SW1:1 remains on ESP32.
  • Added status LED LED1 with current-limit resistor R5 on Pi GPIO18.
  • Added 3-pin debug header as J_DBG with TX, RX, GND.
  • Ran ERC checks and updated capacitor voltage ratings and resistor power ratings where flagged.
Success criteria
  • ✅ Pi header exposes all required rails/signals (+5 V, 3.3 V, UART, LED, button GPIO).
  • ✅ USB-C interface implemented with CC resistor pull-downs and ESD protection.
  • ✅ UART link between Pi and ESP32 with series resistors is reliable.
  • ✅ Original ESP32 + E-Ink functionality is preserved.
  • ✅ Status LED and repurposed button trigger the Python ANSI animation; USB-C serial outputs frames.
Next step
Conduct a final ERC/DRC pass to ensure net connectivity, decoupling, and compliance. Once clean, proceed to PCB layout preparation.
173 days
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U2
Check that none of the unconnected pins require pull-up or pull-down resistors t...
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list all ICs and the decoupling capacitors attached to each. Ensure to include a...
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explain this project.
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please explain what U1 does.
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6
E_INK_SDI
F1 P2 - J_PIZERO 5V[1]
E_INK_CS
J_PIZERO GND[3] - J_PIZERO GND[4]
E_INK_DC
R5 P2 - LED1 A
ESP1 TXD0 - J_PIZERO TXD0/GPIO14
J_PIZERO GPIO18 - R5 P1
J_PIZERO GPIO18 - R5 P1
R3 P1 - J_PIZERO GPIO17/GEN0
E_INK_SDI
F1 P2 - J_PIZERO 5V[1]
E_INK_BUSY
+3V3
J_USB_C GND4 - U2 GND
J_USB_C GND4 - U2 GND
E_INK_DC
J_USB_C VBUS1 - U2 VIN
J_PIZERO GND[7] - J_PIZERO GND[8]
SWITCH
E_INK_CLK
R3 P1 - J_PIZERO GPIO17/GEN0
J_PIZERO GND[7] - J_PIZERO GND[8]
F1 P2 - J_PIZERO 5V[1]
J_PIZERO GND[7] - J_PIZERO GND[8]
J_PIZERO GND[7] - J_PIZERO GND[8]
E_INK_BUSY
J_PIZERO GND[7] - J_PIZERO GND[8]
E_INK_CS
+3V3
J_USB_C GND4 - U2 GND
J_USB_C VBUS1 - U2 VIN
ESP1 TXD0 - J_PIZERO TXD0/GPIO14
+3V3
SWITCH
J_DBG Pin_2 - J_PIZERO RXD0/GPIO15
E_INK_CLK
J_USB_C GND4 - U2 GND
J_PIZERO GND[7] - J_PIZERO GND[8]
SW1
End of Life
R6
Resistance
500 Ω
C6
Capacitance
Capacitance
C3
Capacitance
Capacitance
E-Ink
R3
Resistance
1kΩ
U1
End of Life
R4
Resistance
500 Ω
J_USB_C
R1
Resistance
10kΩ
R5
Resistance
500 Ω
C4
Capacitance
Capacitance
C5
Capacitance
Capacitance
C7
Capacitance
Capacitance
J_USB_C
R2
Resistance
500 Ω
R7
Resistance
500 Ω
ESP1
+3V3
J_UART
J_PIZERO
+3V3
+3V3
+3V3
F1
U3
C2
Capacitance
0.001uF

Reviews

  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
    jharwinbarrozo
    1.1M

Smart Button with E-Ink display

Smart Button with E-Ink display thumbnail
Smart Button Terminal Animator: ESP32 & Raspberry Pi Zero 2 W Edition

Properties

Diagram



  
    
  
  
    
  





































"USB-C node_5V Power/Data"
"CC1 Resistor\n5.1kΩ to GND"
"CC2 Resistor\n5.1kΩ to GND"
"TVS D+ ( VBUS5["5V Rail"
"5V Buck Regulator\nLMR50410"
"3.3V Regulator\nAMS1117-3.3"
VBUS5
"3.3V Rail"
"Raspberry Pi Zero 2 W\n40-pin Header"
"ESP32 MCU"
"Pi TXD0 (GPIO14)"
"Pi RXD0 (GPIO15)"
"47Ω"
"47Ω"
"Pi LED GPIO"
"330Ω"
"Status LED"
"SW1 Button"
"3-pin UART Debug Header"
GND
"E-Ink Display"

Diagram



  
    
  
  
    
  








"USB-C node_5V Power Input"
"Raspberry Pi Zero 2 W\n(40-pin header)"
"ESP32 MCU"
"E-Ink Display"

creativecommons.org/licenses/by/4.0/

Pricing & Availability

Distributor

Qty 1

Arrow

$6.55–$11.62

Digi-Key

$17.13–$17.79

LCSC

$8.88–$9.02

Mouser

$13.19

TME

$0.60

Verical

$6.62–$10.54

Controls

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