Schematic

The circuit, written as code and rendered four ways from one source.

draftgenerated from hardware/oapogee.tsx

This is a netlist, not a pinout

It says what connects to what, which is the design decision worth reviewing. It does not say which physical pin of any package a signal lands on. The pin numbers below are structural placeholders, assigned in the order the labels were written, not read from a datasheet.

That is deliberate. This project never publishes a number it has not measured or sourced, and a datasheet pin number recalled from memory is exactly the kind of confident, plausible, wrong figure that rule exists to prevent. Mapping these functional pins onto real packages is a separate step, done against datasheets, and it has not been done.

Do not lay a board out from this, and do not send anything here to a fabricator.

Drawing Netlist Files

Power along the bottom left, the microcontroller in the middle with every bus leaving its right side, sensors and radio in a column on the right. Arranged to read the same way the system block diagram does.

100%

Drag to pan, scroll or pinch to zoom. With the drawing focused: arrows pan, plus and minus zoom, 0 fits.

COMPONENTS:
 - J1: USB-C-16P
 - R1: 5.1kΩ resistor
 - R2: 5.1kΩ resistor
 - U1: MCP73831
 - R3: 10kΩ resistor
 - J2: S2B-PH-K-S
 - U2: TODO-BUCK-BOOST
 - C1: 10uF capacitor
 - C2: 10uF capacitor
 - U3: RP2350A
 - C3: 100nF capacitor
 - U4: W25Q128JVSIQ
 - U5: BMP390
 - R4: 4.7kΩ resistor
 - R5: 4.7kΩ resistor
 - U6: ICM-42688-P
 - U7: ADXL375
 - U8: SX1262
 - J3: ANT-902-928
 - U9: MAX-M10S
 - LS1: PIEZO-BUZZER
 - D1: RGB-LED
 - SW1: ARM-SWITCH
 - R6: 100kΩ resistor
 - R7: 100kΩ resistor
 - R8: 100kΩ resistor

NET: U1_VDD
  - J1 VBUS
  - U1 VDD

NET: R1_pos
  - J1 CC1
  - R1 pin1

NET: R2_pos
  - J1 CC2
  - R2 pin1

NET: U1_PROG
  - U1 PROG
  - R3 pin1

NET: J1_DP
  - J1 DP
  - U3 USB_DP

NET: J1_DM
  - J1 DM
  - U3 USB_DM

NET: U3_QSPI_SCK
  - U3 QSPI_SCK
  - U4 CLK

NET: U3_QSPI_CS
  - U3 QSPI_CS
  - U4 CS

NET: U4_DI
  - U3 QSPI_D0
  - U4 DI

NET: U4_DO
  - U3 QSPI_D1
  - U4 DO

NET: U4_WP
  - U3 QSPI_D2
  - U4 WP

NET: U4_HOLD
  - U3 QSPI_D3
  - U4 HOLD

NET: U3_SDA
  - U3 SDA
  - U5 SDA
  - R4 pin1

NET: U3_SCL
  - U3 SCL
  - U5 SCL
  - R5 pin1

NET: U3_CS_IMU
  - U3 CS_IMU
  - U6 CS

NET: U3_CS_HIGHG
  - U3 CS_HIGHG
  - U7 CS

NET: U6_SCLK
  - U3 SPI_SCK
  - U6 SCLK
  - U7 SCLK
  - U8 SCK

NET: U3_SPI_MOSI
  - U3 SPI_MOSI
  - U6 SDI
  - U7 SDI
  - U8 MOSI

NET: U3_SPI_MISO
  - U3 SPI_MISO
  - U6 SDO
  - U7 SDO
  - U8 MISO

NET: U3_CS_RADIO
  - U3 CS_RADIO
  - U8 NSS

NET: U3_RADIO_BUSY
  - U3 RADIO_BUSY
  - U8 BUSY

NET: U3_RADIO_DIO1
  - U3 RADIO_DIO1
  - U8 DIO1

NET: U8_ANT
  - U8 ANT
  - J3 ANT

NET: U3_GNSS_TX
  - U3 GNSS_TX
  - U9 RXD

NET: U3_GNSS_RX
  - U3 GNSS_RX
  - U9 TXD

NET: U3_BUZZER
  - U3 BUZZER
  - LS1 IN

NET: U3_LED
  - U3 LED
  - D1 DIN

NET: GND
  - U5 SDO
  - R8 pin2
  - SW1 B
  - D1 GND
  - LS1 GND
  - U9 GND
  - J3 GND
  - U8 GND
  - U7 GND
  - U6 GND
  - U5 GND
  - U4 GND
  - C3 pin2 (-)
  - U3 GND
  - C2 pin2 (-)
  - C1 pin2 (-)
  - U2 GND
  - J2 GND
  - R3 pin2
  - U1 VSS
  - R2 pin2
  - R1 pin2
  - J1 GND

NET: V3V3
  - R6 pin2
  - D1 VDD
  - U9 VCC
  - U8 VDD
  - U7 VDD
  - U6 VDD
  - R5 pin2
  - R4 pin2
  - U5 VDD
  - U4 VCC
  - C3 pin1 (+)
  - U3 VDD
  - U2 VOUT
  - C2 pin1 (+)

NET: VBAT
  - R7 pin1
  - C1 pin1 (+)
  - U2 VIN
  - J2 VBAT
  - U1 VBAT
  - U2 EN

NET: U3_ARM
  - R6 pin1
  - SW1 A
  - U3 ARM

NET: U3_VBAT_SENSE
  - R8 pin1
  - R7 pin2
  - U3 VBAT_SENSE


COMPONENT_PINS:
J1 (USB-C-16P)
- pin1(VBUS): NETS(U1_VDD)
- pin2(GND): NETS(GND)
- pin3(DP): NETS(J1_DP)
- pin4(DM): NETS(J1_DM)
- pin5(CC1): NETS(R1_pos)
- pin6(CC2): NETS(R2_pos)

R1 (5.1kΩ undefined)
- pin1(anode, pos, left): NETS(R1_pos)
- pin2(cathode, neg, right): NETS(GND)

R2 (5.1kΩ undefined)
- pin1(anode, pos, left): NETS(R2_pos)
- pin2(cathode, neg, right): NETS(GND)

U1 (MCP73831)
- pin1(STAT): NOT_CONNECTED
- pin2(VSS): NETS(GND)
- pin3(VBAT): NETS(VBAT)
- pin4(VDD): NETS(U1_VDD)
- pin5(PROG): NETS(U1_PROG)

R3 (10kΩ undefined)
- pin1(anode, pos, left): NETS(U1_PROG)
- pin2(cathode, neg, right): NETS(GND)

J2 (S2B-PH-K-S)
- pin1(VBAT): NETS(VBAT)
- pin2(GND): NETS(GND)

U2 (TODO-BUCK-BOOST)
- pin1(VIN): NETS(VBAT)
- pin2(GND): NETS(GND)
- pin3(EN): NETS(VBAT)
- pin4(VOUT): NETS(V3V3)

C1 (10uF undefined)
- pin1(pos): NETS(VBAT)
- pin2(neg): NETS(GND)

C2 (10uF undefined)
- pin1(pos): NETS(V3V3)
- pin2(neg): NETS(GND)

U3 (RP2350A)
- pin1(VDD): NETS(V3V3)
- pin2(GND): NETS(GND)
- pin3(USB_DP): NETS(J1_DP)
- pin4(USB_DM): NETS(J1_DM)
- pin5(QSPI_SCK): NETS(U3_QSPI_SCK)
- pin6(QSPI_CS): NETS(U3_QSPI_CS)
- pin7(QSPI_D0): NETS(U4_DI)
- pin8(QSPI_D1): NETS(U4_DO)
- pin9(QSPI_D2): NETS(U4_WP)
- pin10(QSPI_D3): NETS(U4_HOLD)
- pin11(SDA): NETS(U3_SDA)
- pin12(SCL): NETS(U3_SCL)
- pin13(SPI_SCK): NETS(U6_SCLK)
- pin14(SPI_MOSI): NETS(U3_SPI_MOSI)
- pin15(SPI_MISO): NETS(U3_SPI_MISO)
- pin16(CS_IMU): NETS(U3_CS_IMU)
- pin17(CS_HIGHG): NETS(U3_CS_HIGHG)
- pin18(CS_RADIO): NETS(U3_CS_RADIO)
- pin19(RADIO_BUSY): NETS(U3_RADIO_BUSY)
- pin20(RADIO_DIO1): NETS(U3_RADIO_DIO1)
- pin21(GNSS_TX): NETS(U3_GNSS_TX)
- pin22(GNSS_RX): NETS(U3_GNSS_RX)
- pin23(BUZZER): NETS(U3_BUZZER)
- pin24(LED): NETS(U3_LED)
- pin25(VBAT_SENSE): NETS(U3_VBAT_SENSE)
- pin26(RUN): NOT_CONNECTED
- pin27(ARM): NETS(U3_ARM)

C3 (100nF undefined)
- pin1(pos): NETS(V3V3)
- pin2(neg): NETS(GND)

U4 (W25Q128JVSIQ)
- pin1(CS): NETS(U3_QSPI_CS)
- pin2(DO): NETS(U4_DO)
- pin3(WP): NETS(U4_WP)
- pin4(GND): NETS(GND)
- pin5(DI): NETS(U4_DI)
- pin6(CLK): NETS(U3_QSPI_SCK)
- pin7(HOLD): NETS(U4_HOLD)
- pin8(VCC): NETS(V3V3)

U5 (BMP390)
- pin1(VDD): NETS(V3V3)
- pin2(GND): NETS(GND)
- pin3(SDA): NETS(U3_SDA)
- pin4(SCL): NETS(U3_SCL)
- pin5(SDO): NETS(GND)

R4 (4.7kΩ undefined)
- pin1(anode, pos, left): NETS(U3_SDA)
- pin2(cathode, neg, right): NETS(V3V3)

R5 (4.7kΩ undefined)
- pin1(anode, pos, left): NETS(U3_SCL)
- pin2(cathode, neg, right): NETS(V3V3)

U6 (ICM-42688-P)
- pin1(VDD): NETS(V3V3)
- pin2(GND): NETS(GND)
- pin3(SCLK): NETS(U6_SCLK)
- pin4(SDI): NETS(U3_SPI_MOSI)
- pin5(SDO): NETS(U3_SPI_MISO)
- pin6(CS): NETS(U3_CS_IMU)
- pin7(INT1): NOT_CONNECTED

U7 (ADXL375)
- pin1(VDD): NETS(V3V3)
- pin2(GND): NETS(GND)
- pin3(SCLK): NETS(U6_SCLK)
- pin4(SDI): NETS(U3_SPI_MOSI)
- pin5(SDO): NETS(U3_SPI_MISO)
- pin6(CS): NETS(U3_CS_HIGHG)

U8 (SX1262)
- pin1(VDD): NETS(V3V3)
- pin2(GND): NETS(GND)
- pin3(SCK): NETS(U6_SCLK)
- pin4(MOSI): NETS(U3_SPI_MOSI)
- pin5(MISO): NETS(U3_SPI_MISO)
- pin6(NSS): NETS(U3_CS_RADIO)
- pin7(BUSY): NETS(U3_RADIO_BUSY)
- pin8(DIO1): NETS(U3_RADIO_DIO1)
- pin9(ANT): NETS(U8_ANT)

J3 (ANT-902-928)
- pin1(ANT): NETS(U8_ANT)
- pin2(GND): NETS(GND)

U9 (MAX-M10S)
- pin1(VCC): NETS(V3V3)
- pin2(GND): NETS(GND)
- pin3(TXD): NETS(U3_GNSS_RX)
- pin4(RXD): NETS(U3_GNSS_TX)
- pin5(RF_IN): NOT_CONNECTED

LS1 (PIEZO-BUZZER)
- pin1(IN): NETS(U3_BUZZER)
- pin2(GND): NETS(GND)

D1 (RGB-LED)
- pin1(DIN): NETS(U3_LED)
- pin2(VDD): NETS(V3V3)
- pin3(GND): NETS(GND)
- pin4(DOUT): NOT_CONNECTED

SW1 (ARM-SWITCH)
- pin1(A): NETS(U3_ARM)
- pin2(B): NETS(GND)

R6 (100kΩ undefined)
- pin1(anode, pos, left): NETS(U3_ARM)
- pin2(cathode, neg, right): NETS(V3V3)

R7 (100kΩ undefined)
- pin1(anode, pos, left): NETS(VBAT)
- pin2(cathode, neg, right): NETS(U3_VBAT_SENSE)

R8 (100kΩ undefined)
- pin1(anode, pos, left): NETS(U3_VBAT_SENSE)
- pin2(cathode, neg, right): NETS(GND)

Netlistoapogee-netlist.txt6 kB

The connectivity as text. Diffable, reviewable, and the thing to read first.

Schematicoapogee-schematic.svg266 kB

The same connectivity, drawn.

KiCad schematicoapogee.kicad_sch297 kB

For anyone who wants to take the design further in KiCad.

Circuit JSONoapogee-circuit.json316 kB

Machine readable, for anyone writing their own tooling against the design.

Why there is no PCB here

A layout needs real footprints, real footprints need the datasheet pin mapping this design has not done, and an autorouted board built on placeholder pins would look far more finished than it is. That is the one thing this project must not ship, so the PCB and 3D outputs are deliberately not produced rather than produced with a caveat nobody reads.

How to change it

Edit hardware/oapogee.tsx and run make hw. The build fails if the committed drawing stops matching the source, so the schematic cannot drift from the design the way a hand-drawn one does. See hardware/README.md.