PCB Design Specifications

flux

Understood — I’ll leave the RGB LED for later.
I started checking the 9-pin Arduino header change, but this run is blocked because the last request arrived after the prior task state had already ended. The required next action is to replace the current J7 10-pin ARDUINO_EXT header with a 9-pin male header, wire pins 1–9 as specified, move it to the bottom-center edge facing downward, and update Design Notes.
S

swapnil007

YES DO IT

flux

Confirmed. I’ll now replace the current ARDUINO_EXT with a 9-pin male header, wire pins 1–9 exactly as listed, place it at the bottom-center edge facing downward, update the notes, and re-run review.

flux

I replaced the previous 10-pin J7 ARDUINO_EXT connector with a 9-pin horizontal 2.54 mm male header part as requested.
I was stopped by credit limits immediately after the replacement, so the new J7 still needs to be re-wired and placed. Remaining work:
  • Wire J7:
    • Pin 1 → VBOOST
    • Pin 2 → GND
    • Pin 3 → VDIV1
    • Pin 4 → VDIV2
    • Pin 5 → RGB_R
    • Pin 6 → RGB_G
    • Pin 7 → RGB_B
    • Pin 8 → I2C_SDA
    • Pin 9 → I2C_SCL
  • Place J7 at the bottom-center board edge, opening facing downward.
  • Update the ARDUINO_EXT silkscreen label and Design Notes.
  • Re-run review; existing locked stale routing/unrouted airwire issues were already present before this change.
Wire and place J7
Run ERC/DRC
Update labels and notes
Manual wiring help
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Pins

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Layout

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Design Notes
Board Setup
  • Board: 100 mm x 100 mm, 2-layer stackup.
  • Top layer: components and routing.
  • Bottom layer: GND copper pour.
  • Edge keepout: 2 mm.
  • Power trace target: 1.5 mm.
  • Signal trace target: 0.3 mm.
  • Minimum clearance: 0.2 mm; 0.5 mm near large storage capacitors.
Input and Rectifier Block
  • J1: PIEZO_INPUT screw terminal, pin 1 = PIEZO_POS, pin 2 = GND.
  • C1: 1 uF, 50 V ceramic input capacitor across PIEZO_POS and GND.
  • D1-D4: 1N5819 Schottky diodes used as the requested rectifier network.
  • RECT_POS: positive rectified output.
  • C2: 470 uF, 25 V bulk storage capacitor from RECT_POS to GND.
  • J2: TP1 test header, pin 1 = RECT_POS, pin 2 = GND.
Cockcroft-Walton Multiplier Block
  • Added a 4-stage multiplier in the center board region (user x=40-65 mm from the left edge, center-origin X -10 mm to +15 mm).
  • Diodes D5-D12: 1N5819 Schottky diodes.
  • Capacitors C3-C10: 10 uF, 25 V aluminum electrolytic capacitors. The user requested C1-C8 for the multiplier, but C1 and C2 were already assigned to the input filter and rectifier bulk capacitor, so the multiplier capacitors are C3-C10 to preserve unique designators.
  • C3-C6 are the series charge capacitor stack; C7-C10 are the shunt transfer/output capacitor stack.
  • MULT_POS is the multiplier positive output.
  • D13 is a 1N5819 protection diode from MULT_POS (anode) to SCAP_IN (cathode) to prevent reverse discharge from the supercapacitor.
  • J3: TP2 test header, pin 1 = MULT_POS, pin 2 = GND.
Supercapacitor Energy Storage Block
  • Added a 2-cell series supercapacitor storage stage in the user x=65-80 mm region (center-origin X +15 mm to +30 mm).
  • C11 = CAP_A: positive to SCAP_IN, negative to SCAP_MID.
  • C12 = CAP_B: positive to SCAP_MID, negative to GND.
  • R1 = 10 kΩ balancing resistor across CAP_A from SCAP_IN to SCAP_MID.
  • R2 = 10 kΩ balancing resistor across CAP_B from SCAP_MID to GND.
  • Combined target per user request: 5.4 V maximum, 0.5 F effective.
  • J4: TP3 test header, pin 1 = SCAP_IN, pin 2 = GND.
  • Silkscreen warning added near the supercapacitors: MAX 5.4V.
Battery Input and MT3608 Boost Module Block
  • J5: BATTERY_INPUT screw terminal block at the left board edge below PIEZO_INPUT. Pin 1 = BAT_IN, pin 2 = GND.
  • BAT_IN is intended for 3.7-4.2 V from TP4056 output positive.
  • J6: 4-pin 2.54 mm male header used as the MT3608 boost converter module interface. Pin 1 = IN+ / BAT_IN, pin 2 = IN- / GND, pin 3 = OUT+ / VBOOST, pin 4 = OUT- / GND.
  • VBOOST is the regulated 5 V output from the external MT3608 module.
  • C13 = C_BOOST: 100 nF, 50 V ceramic decoupling capacitor from VBOOST to GND placed beside the boost output header.
  • Silkscreen warning near the boost header: SET TRIMMER TO 5V BEFORE USE.
  • Power-budget caveat: downstream VBOOST load current is not specified yet. For boost converters, input current must be calculated with the lowest battery voltage using I_in = (V_out x I_out) / (V_in_min x efficiency). BAT_IN trace/current sizing should be revisited when the 5 V load is known.
Arduino ADC Voltage Divider Block
  • J7: ARDUINO_EXT 10-pin 2.54 mm header for Arduino analog and I2C sensing. Pin 3 = VDIV1, pin 4 = VDIV2, pin 8 = I2C_SDA, pin 9 = I2C_SCL. Pins 1, 2, 5, 6, 7, and 10 are reserved/unassigned and marked no-connect.
  • VDIV1 supercapacitor voltage sense: R3 = 10 kΩ from SCAP_IN to VDIV1, R4 = 47 kΩ from VDIV1 to GND, and VDIV1 connects to J7 pin 3.
  • VDIV1 scaling: VOUT = VIN x 47 kΩ / (10 kΩ + 47 kΩ). At SCAP_IN = 5.4 V, VDIV1 ≈ 4.45 V for safe Arduino ADC reading when using a 5 V ADC reference.
  • VDIV2 live generation sense: R5 = 10 kΩ from RECT_POS to VDIV2, R6 = 47 kΩ from VDIV2 to GND, and VDIV2 connects to J7 pin 4.
  • Silkscreen labels added: ARDUINO_EXT, VDIV1, and VDIV2.
OLED Display Headers
  • J8: OLED_096 / I2C 0x3C / LIVE GENERATION 4-pin female header at the upper-right board edge. Pin 1 = VBOOST, pin 2 = GND, pin 3 = I2C_SDA, pin 4 = I2C_SCL.
  • C14: 100 nF local decoupling capacitor from VBOOST to GND placed at J8.
  • J9: OLED_13 / I2C 0x3D / ENERGY STORED 4-pin female header stacked below J8 on the right side. Pin 1 = VBOOST, pin 2 = GND, pin 3 = I2C_SDA, pin 4 = I2C_SCL.
  • C15: 100 nF local decoupling capacitor from VBOOST to GND placed at J9.
  • J8 and J9 share I2C_SDA and I2C_SCL through ARDUINO_EXT pins 8 and 9.
  • Silkscreen note added near J9: BRIDGE BACK JUMPER TO SET 0x3D.
  • Reminder: OLED modules commonly include I2C pull-ups; if neither OLED module nor Arduino carrier provides pull-ups, add one 4.7 kΩ pull-up pair from SDA/SCL to the logic rail used by the Arduino I2C interface.
Notes
  • The requested bridge list named D4 anode as PIEZO_NEG, but the input connector defined pin 2 as GND and did not provide a separate PIEZO_NEG terminal. D4 anode is therefore tied to GND in this implementation.
  • Electrolytic capacitor polarities in the Cockcroft-Walton ladder were oriented so each positive terminal connects to the higher-potential/lifted stage node and each negative terminal connects to the lower-potential node or GND.
  • Exact 2.7 V 1 F supercapacitor parts were not found in the available library. The layout uses available 1 F EDLC parts with higher per-device voltage rating as placeholders while preserving the requested 5.4 V system warning and series stack topology.

  • Board Setup

  • Input and Rectifier Block

  • Cockcroft-Walton Multiplier Block

  • Supercapacitor Energy Storage Block

  • Battery Input and MT3608 Boost Module Block

  • Arduino ADC Voltage Divider Block

  • OLED Display Headers

  • Notes