• Status: Schematic checkpoint complete; initial board setup established.
• 36 × 36 mm prototype quadcopter flight-controller carrier with 30.5 × 30.5 mm mounting-hole centers.
• Uses a removable ESP32-S3 SuperMini daughterboard, a permanently soldered GY-87 module, and a 4-in-1 BLHeli_S ESC interface.

• Bench development and cautious short-range prototype flight.
• Not production-certified or intended for long-range/BVLOS operation.

• Read the GY-87 sensors over I2C.
• Generate four independent motor-control signals that default low/disarmed.
• Provide short-range configuration/telemetry through Wi-Fi or BLE.
• Monitor 2S battery voltage and the ESC current output.

• Removable ESP32-S3 SuperMini on two female socket rows, preserving its onboard USB, BOOT, RESET, regulator, and antenna.
• Permanently soldered GY-87 through an eight-pin male/header through-hole interface.
• Four protected/damped ESC command outputs.
• Protected 2S input and regulated 5V rail.
• Filtered/protected VBAT and current ADC inputs.
• Five bring-up test points and four M3 mounting holes.

Diagram

• J1: JST SM08B-GHS-TB(LF)(SN), 8-circuit 1.25mm-pitch locking GH-series side-entry SMT header, documented to mate with the GHR-08V-S housing class.
• User-defined pin order: 1 GND, 2 VBAT, 3 M1, 4 M2, 5 M3, 6 M4, 7 Current, 8 NC.
• J1 pin 1 creates the mandatory common controller/ESC ground.
• Pins 9 and 10 are footprint reinforcement terminals and are intentionally NC in the schematic.
• The supplied harness is assumed to be JST-GH-compatible from its reported/photo appearance; continuity-check every wire and identify pin 1 before plugging in because connector mounting-side and mating-end views can visually reverse left-to-right order.

• F1: 1206L110/16WR, 1.1A-hold resettable fuse.
• D1: SS34FA series Schottky reverse-polarity protection.
• D2: SM6T10A input transient clamp.
• U1: TI LMR33630BDDAR, adjustable synchronous buck, configured for 5V.
• Reference values used: L1 2.2uH; C1 10uF; C2 220nF; C3 100nF BOOT-to-SW; C4 1uF VCC; C5/C6 22uF; R1 100kΩ; R2 24.9kΩ.
• C7 100uF protected-input bulk and C8 47uF 5V local bulk support cable and radio transients.

• The SuperMini is not directly soldered and is not represented as a bare ESP32 module.
• J2: 1×10 female socket row, selected common representation: 5V, GND, 3V3, GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO6, GPIO7.
• J3: 1×8 female socket row, selected common representation: GPIO8, GPIO9, GPIO10, GPIO11, GPIO12, GPIO13, TX/GPIO43, RX/GPIO44.
• The purchased SuperMini receives soldered male headers and plugs into J2/J3.
• Mandatory pre-assembly check: match every printed pin label on the exact purchased board against J2/J3. SuperMini variants are not guaranteed pin-compatible.
• Future component placement must leave the daughterboard USB connector, BOOT, RESET, and antenna unobstructed; no copper or components should intrude into the antenna keepout.

• J4: 1×8 vertical male/header through-hole footprint for permanent soldered installation, pins documented as VCC_IN, 3V, GND, SCL, SDA, FSYNC, INTA, DRDY.
• Powered from the SuperMini 3V3 output through J4 pin 2; VCC_IN is intentionally NC.
• I2C uses the user-fixed mapping GPIO8 SDA and GPIO9 SCL.
• No carrier-board I2C pull-ups are fitted. Assumption: the purchased GY-87 already contains pull-ups; measure the bus before assembly and add only one pull-up pair if absent.
• Place the module with its physical X/Y/forward marking aligned to the PCB forward note; verify axes for the exact module revision in firmware.
• Keep the module orientation marking visible after permanent soldering.

• VBAT: R3 180kΩ / R4 68kΩ divider; 8.4V produces approximately 2.30V before R5. R5 4.7kΩ, C10 100nF, and D3 3.3V zener provide filtering/protection. Read on GPIO1 / ADC1.
• ESC Current: scale is intentionally unspecified. R6 10kΩ, R7 100kΩ pulldown, C11 100nF, and D4 3.3V zener provide conservative conditioning. Read on GPIO2 / ADC1. Calibration is mandatory; no amperes-per-volt value is assumed.

• Propulsion current does not pass through this PCB.
• Estimated 5V peak load is 650mA.
• At 6.0V input and 85% assumed conversion efficiency, controller input current is about 0.64A; F1 and U1 provide margin.

• LMR33630BDDAR selected for substantial VIN and output-current margin.
• The removable SuperMini uses real female socket headers; the permanent GY-87 uses a real male/header through-hole footprint rather than a fabricated custom module symbol.
• ADC pins are GPIO1/GPIO2; motor pins GPIO4-GPIO7; I2C GPIO8/GPIO9.
• No duplicate I2C pull-up pair fitted pending verification of the purchased GY-87.

• Exact purchased ESP32-S3 SuperMini row labels and mechanical spacing must be checked before assembly; the schematic uses the selected common 1×10 + 1×8 representation.
• Verify whether the actual GY-87 3V pin accepts regulated 3.3V input and verify onboard pull-ups.
• Verify the ESC accepts 3.3V command logic.
• Verify the included ESC harness housing is genuinely GHR-08V-S/JST-GH-compatible and continuity-check the cable order/pin-1 orientation before mating.
• Calibrate ESC Current empirically or from the ESC manufacturer documentation.
• Full component placement, antenna keepout geometry, USB/button clearance, and routing remain the next phase.

• Completed full schematic connectivity, power tree, motor safety network, ADC conditioning, test points, and NC markings.
• Updated removable SuperMini implementation to J2/J3 female socket rows per user clarification.
• Updated J4 to a male/header through-hole footprint for permanent GY-87 soldering.
• Set the board appearance requirement and layout visualization to black solder mask with white silkscreen.
• Established 36 × 36 mm outline, 4-layer stackup, mounting holes, and forward note.