Ref,Qty,Value,Footprint,MPN/JLCPCB part,DNP(y/n),Notes
U1,1,ESP32-WROOM-32E,RF_Module:ESP32-WROOM-32,ESP32-WROOM-32E / JLCPCB C701343,n,SMD castellated 38-pad module; antenna overhangs board edge (see keep-out)
J1,1,Stack_2x13,Connector_PinHeader_2.54mm:PinHeader_2x13_P2.54mm_Vertical,Generic 2x13 2.54mm,n,Stacking pass-through bus; mirror header on bottom shares same nets
J2,1,PROG_1x6,Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical,Generic 1x6 2.54mm,n,Programming/serial: GND +5V RX(IO3) TX(IO1) DTR RTS
J3,1,HUD_SH1.0_1x6,Connector_JST:JST_SH_BM06B-SRSS-TB_1x06-1MP_P1.00mm_Vertical,JST BM06B-SRSS-TB,n,TOP board only: 1=+5V 2=GND 3=SDA 4=SCL 5=SPARE 6=NC. Verify pin order vs HUD cable
Q1,1,MMBT3904,Package_TO_SOT_SMD:SOT-23,MMBT3904 / JLCPCB C20526,n,Auto-reset (DTR->EN)
Q2,1,MMBT3904,Package_TO_SOT_SMD:SOT-23,MMBT3904 / JLCPCB C20526,n,Auto-boot (RTS->IO0)
SW1,1,EN/RESET,Button_Switch_SMD:SW_SPST_PTS645,PTS645 series,n,Tactile EN->GND
SW2,1,BOOT/IO0,Button_Switch_SMD:SW_SPST_PTS645,PTS645 series,n,Tactile IO0->GND
JP1,1,0R,Resistor_SMD:R_0603_1608Metric,0R 0603,n,I2S_BCK=GPIO5 (SINK column)
JP2,1,0R,Resistor_SMD:R_0603_1608Metric,0R 0603,n,I2S_WS=GPIO25 (SINK column)
JP3,1,0R,Resistor_SMD:R_0603_1608Metric,0R 0603,n,I2S_DATA=GPIO23 (SINK column)
JP4,1,0R,Resistor_SMD:R_0603_1608Metric,0R 0603,n,I2S_BCK=GPIO19 (BROADCASTER column)
JP5,1,0R,Resistor_SMD:R_0603_1608Metric,0R 0603,n,I2S_WS=GPIO18 (BROADCASTER column)
JP6,1,0R,Resistor_SMD:R_0603_1608Metric,0R 0603,n,I2S_DATA=GPIO22 (BROADCASTER column)
R1,1,33R,Resistor_SMD:R_0402_1005Metric,33R 0402,y,I2S_BCK series term (optional; DNP default)
R2,1,33R,Resistor_SMD:R_0402_1005Metric,33R 0402,y,I2S_WS series term (optional; DNP default)
R3,1,33R,Resistor_SMD:R_0402_1005Metric,33R 0402,y,I2S_DATA series term (optional; DNP default = 0R jumper if not fitted)
R4,1,4.7k,Resistor_SMD:R_0402_1005Metric,4.7k 0402,y,SDA pull-up to 3V3. Populate on SINK only (single pull-up on bus)
R5,1,4.7k,Resistor_SMD:R_0402_1005Metric,4.7k 0402,y,SCL pull-up to 3V3. Populate on SINK only (single pull-up on bus)
R6,1,10k,Resistor_SMD:R_0402_1005Metric,10k 0402,n,EN pull-up to 3V3
R7,1,10k,Resistor_SMD:R_0402_1005Metric,10k 0402,n,IO0 pull-up to 3V3
R8,1,10k,Resistor_SMD:R_0402_1005Metric,10k 0402,n,Q1 base resistor (auto-reset)
R9,1,10k,Resistor_SMD:R_0402_1005Metric,10k 0402,n,Q2 base resistor (auto-boot)
R10,1,10k,Resistor_SMD:R_0402_1005Metric,10k 0402,n,ADDR0/GPIO13 strap to 3V3 (populate this OR R11)
R11,1,0R,Resistor_SMD:R_0402_1005Metric,0R 0402,y,ADDR0/GPIO13 strap to GND (populate this OR R10)
R12,1,10k,Resistor_SMD:R_0402_1005Metric,10k 0402,n,ADDR1/GPIO14 strap to 3V3 (populate this OR R13)
R13,1,0R,Resistor_SMD:R_0402_1005Metric,0R 0402,y,ADDR1/GPIO14 strap to GND (populate this OR R12)
R14,1,10k,Resistor_SMD:R_0402_1005Metric,10k 0402,n,ADDR2/GPIO27 strap to 3V3 (populate this OR R15)
R15,1,0R,Resistor_SMD:R_0402_1005Metric,0R 0402,y,ADDR2/GPIO27 strap to GND (populate this OR R14)
R16,1,10k,Resistor_SMD:R_0402_1005Metric,10k 0402,n,ADDR3/GPIO26 strap to 3V3 (populate this OR R17)
R17,1,0R,Resistor_SMD:R_0402_1005Metric,0R 0402,y,ADDR3/GPIO26 strap to GND (populate this OR R16)
C1,1,1uF,Capacitor_SMD:C_0603_1608Metric,1uF 0603,n,EN to GND (reset delay)
C2,1,100nF,Capacitor_SMD:C_0402_1005Metric,100nF 0402,n,IO0 to GND (boot debounce)
C3,1,100nF,Capacitor_SMD:C_0402_1005Metric,100nF 0402,n,DTR coupling cap to Q1
C4,1,100nF,Capacitor_SMD:C_0402_1005Metric,100nF 0402,n,RTS coupling cap to Q2
C5,1,10uF,Capacitor_SMD:C_0805_2012Metric,10uF 0805,n,3V3 bulk at WROOM 3V3 pad
C6,1,100nF,Capacitor_SMD:C_0402_1005Metric,100nF 0402,n,3V3 decap at WROOM 3V3 pad
C7,1,100nF,Capacitor_SMD:C_0402_1005Metric,100nF 0402,n,3V3 decap at WROOM 3V3 pad
C8,1,10uF,Capacitor_SMD:C_0805_2012Metric,10uF 0805,n,+5V bulk at stacking connector
C9,1,22uF,Capacitor_SMD:C_0805_2012Metric,22uF 0805,n,3V3 bulk rail
H1,1,MountingHole_M3,MountingHole:MountingHole_3.2mm_M3,-,n,Corner mount, 38x38mm pattern, GND-tied
H2,1,MountingHole_M3,MountingHole:MountingHole_3.2mm_M3,-,n,Corner mount, GND-tied
H3,1,MountingHole_M3,MountingHole:MountingHole_3.2mm_M3,-,n,Corner mount, GND-tied
H4,1,MountingHole_M3,MountingHole:MountingHole_3.2mm_M3,-,n,Corner mount, GND-tied