EEG BCI Drone Control PCB Design

flux

0:08

Work done
  • Built the main schematic around U1, U2, U3, U4, U5, U6, and U7.
  • Implemented the EEG front end with the six mapped channels through J2, RC input filtering, SRB1 mastoid reference, and BIAS routing.
  • Wired split analog and digital rails with named nets for +3V3_A, +3V3_D, AGND, DGND, VBAT_3V7, +5V, and -5V_AVSS.
  • Added ADS1299 support capacitors, ESP32 boot support around R11, R12, C16, and charger / bias support around R6, R13, and C7.
  • Set the layout to 80 x 60 mm with a 4-layer stackup and baseline board rules suitable for this mixed-signal design.
  • Updated the project name and description to match the implemented EEG BCI architecture.
Success criteria review
  • ✅ Core schematic blocks are present: EEG AFE, ESP32 control, LiPo input, charger, boost, inverter, split 3.3 V regulators, channel mapping, and named power domains.
  • ✅ Layout target was set to the required 80 x 60 mm with a 4-layer stackup, which is the right class of stackup for mixed-signal SPI plus multi-rail power integrity .
  • ✅ ESP32 boot handling follows the required pattern of GPIO0 pulled high by default and EN held high with RC support .
  • ❌ The board is not placement-complete inside the required floorplan. Current density is reported as critical on 80 x 60 mm, so the exact requested placement arrangement is not yet physically realized.
  • ❌ The schematic still needs one cleanup pass before it is fabrication-ready: some ERC floating pins remain, the MT3608 feedback divider still needs a final sanity correction, and several intentionally-unused pins should be tied off or explicitly left unconnected.
  • ❌ The BOM exists, but many generic passives still need production MPN assignment before manufacturing release, which is required during physical-constraints finalization .
Next steps I can continue with the final cleanup pass now: fix the remaining regulator/ground details, explicitly terminate unused ADS1299 and ESP32 pins, assign real MPNs to the generic passives, and then re-run ERC/DRC. After that, the next physical issue is that 80 x 60 mm is extremely tight for this component set, so I can either optimize placement aggressively within that size or help trim the design for routability.
Lock exact pin map
Specify electrode connectors
Set power rail details
Define layout constraints
21 days
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U2
C21 P2 - C22 P2
C21 P2 - C22 P2
J1 1 - U3 BAT
U2 AVDD1 - C21 P1
J1 1 - U3 BAT
U2 ~PWDN - U1 IO15
U3 PROG - R6 P1
C13 P2 - C14 P2
J2 8 - U2 BIASOUT
U2 AVSS1 - U2 VREFN
U1 GND - U2 DGND_1
R8 P2 - R9 P2
C13 P2 - C14 P2
R8 P2 - R9 P2
U2 DIN - U1 IO23
U2 AVDD1 - C21 P1
U2 IN6N - U2 SRB2
U2 ~DRDY - U1 IO4
U2 ~CS - U1 IO5
U1 EN - C16 P1
R4 P2 - U2 IN4P
U2 AVDD1 - C21 P1
U4 SW - L1 P1
U2 ~DRDY - U1 IO4
U5 VOUT - C10 P1
C21 P2 - C22 P2
U2 DIN - U1 IO23
U2 DOUT - U1 IO19
U5 CAP- - C8 P2
U2 START - U1 IO16
U2 DOUT - U1 IO19
U6 INPUT - U7 INPUT
R8 P2 - R9 P2
U5 CAP+ - C8 P1
U6 INPUT - U7 INPUT
U3 EP - U7 ADJ/GND
U2 SCLK - U1 IO18
R5 P2 - U2 IN5P
U3 EP - U4 GND
U2 CLK - U1 GND
U6 INPUT - U7 INPUT
U2 AVSS1 - U2 VREFN
U2 SCLK - U1 IO18
R1 P2 - U2 IN1P
R6 P2 - U2 IN6P
R8 P2 - R9 P2
R2 P2 - U2 IN2P
U2 VCAP1 - C34 P1
U4 FB - R14 P1
U2 CLKSEL - R7 P2
U2 START - U1 IO16
U2 AVDD1 - C21 P1
U2 CLK - U1 GND
U2 AVDD1 - C21 P1
U2 BIASREF - U2 VCAP3
U2 IN6N - U2 SRB2
R13 P2 - U2 BIASIN
C21 P2 - C22 P2
U2 ~RESET - U1 IO2
U6 INPUT - U7 INPUT
U1 IO0 - R12 P1
U2 AVDD1 - C21 P1
U3 EP - U7 ADJ/GND
U2 ~PWDN - U1 IO15
C13 P2 - C14 P2
J1 1 - U3 BAT
U2 BIASREF - U2 VCAP3
J2 7 - U2 SRB1
R3 P2 - U2 IN3P
U2 ~CS - U1 IO5
U2 AVDD1 - C21 P1
U2 AVDD1 - C21 P1
U6 INPUT - U7 INPUT
U2 ~RESET - U1 IO2
U3 EP - U7 ADJ/GND
U2 VCAP2 - C35 P1
U1
U3
U4
U5
  • 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
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    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
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    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
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  • 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
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    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
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
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Hybrid EEG BCI for Pluto X v1.1 thumbnail
Hybrid EEG BCI for Pluto X v1.1 using ESP32-WROOM-32 and ADS1299-6PAG with LiPo charging, 5V boost, -5V analog rail, split 3.3V analog/digital regulators, six EEG channels, RC electrode protection, and 80x60mm mixed-signal PCB constraints.

Properties

Diagram



  
    
  
  
    
  























SPI and control



















LiPo 3.7V Battery
TP4056 Charger
VBAT Rail
MT3608 Boost node_5V
5V Rail
ICL7660 Inverter
-5V Rail
LM1117 3.3V Analog
LM1117 3.3V Digital
3.3V Analog
3.3V Digital
ADS1299 EEG AFE
ESP32 WROOM 32
EEG Electrodes
2.2k and node_1nF Input Filters
Bias and Reference Network
AGND
Star Ground
DGND

Pricing & Availability

Distributor

Qty 1

Arrow

$47.06–$50.95

Digi-Key

$69.44

LCSC

$41.94–$42.30

Mouser

$78.65

TME

$2.64

Verical

$1.48–$73.29

Controls