2 layers32.8 × 52.5 mm
Scrapped
matarga/simple-devboard
Mk1 is the internal name of this project. I am using this as a way to learn about PCB design and embedded systems and make a "final" out of it.
52 parts
6 layers72.5 × 53 mm
Scrapped
matarga/simple-devboardMk1 is the internal name of this project. I am using this as a way to learn about PCB design and embedded systems and make a "final" out of it. The "final" that I have made is a simple, low-cost, ESP32-S3 development board. I originally added tons of sensors and complexity but shaved them off to make the project more attainable.
- Size
- 72.5 × 53 mm
- Copper layers
- 6
- Thickness
- 2.22 mm
- Parts
- 38
- Nets
- 76
- Pads
- 294
- Tracks, vias
- 830, 81
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 17 May 2026
- Updated
- 6 Jul 2026
Overview
Scrapped is an open-source printed circuit board by matarga, from the matarga/simple-devboard repository on GitHub. It is a 6-layer board of 72.5 × 53 mm with 38 parts on 76 nets, routed with 830 tracks and 81 vias.
It is built around the BME680, FT231XQ-R and AMS1117-3.3, with the MPU-9250 and RJ45 among its other parts. Its parts include 11 resistors, 7 capacitors, 5 ICs, 5 connectors and 4 diodes. It belongs with the sensors and measurement and microcontroller boards boards and the ESP32 boards of this library.
Main components
5
BME680
LGA-8-40℃~+85℃ 0.12hpa 0.6hpa 1.3pa/K 1.71V~3.6V 150nA 30Kpa~1.1bar I2C、SPI Temperature Sensor LGA-8 Pressure Sensors ROHSBosch SensortecPressure Sensors
FT231XQ-R
QFN-20-EP(4x4)-40℃~+85℃ 125uA 3.3V~5V 8mA USB 2.0 USB to UART QFN-20-EP(4x4) USB Converters ROHSFTDIUSB Converters
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MPU-9250
QFN-24-EP(3x3)-40℃~+85℃ 2.4V~3.6V 8uA IMU (accelerometer + gyroscope) Motion event detection SPI、I2C X,Y,Z X,Y,Z ±16g ±2000dps QFN-24-EP(3x3) Accelerometers ROHSTDK InvenSenseAccelerometers
RJ45
TH-12PTH-12P SMT ROHSJLCPCB AssemblyUncategorised
README
README.mdMk1
Mk1 is the internal name of this project. I am using this as a way to learn about PCB design and embedded systems and make a "final" out of it. The "final" that I have made is a simple, low-cost, ESP32-S3 development board. I originally added tons of sensors and complexity but shaved them off to make the project more attainable. The board functions similar to most other boards, boasting a USB to Serial converter, a sample IMU sensor for SPI testing, and extra essentials like auto reset circuits and a voltage regulator. The board has gone well but I advise most to not use any of these designs for future projects of their own. If you do, don't be surprised when it blows up in your face.
Horizons reviews please check in the /REVIEWERS folder
Journal logs are in the /documentation folder of this repo
The schematic breakdown goes as follows:
The ESP32-S3
The power rails start with two decoupling capacitors before then merging with reset and boot circuit through pull up resistors
The IMU
The IMU is a simple MPU-9250 following the schematic posted its online datasheet
USB to Serial IC
The USB to Serial IC is a FTDI FT231XQ also following the schematic posted in its datasheet
Auto reset
The auto reset circuit is a set of two 2N3984 transistors that feed into the DTR and RTS pins of the FT231XQ, When a handshake is sent by the flashing device the devboard can enter bootloader states without the need of a button press on the board, though the buttons are still included as a fallback
USB Port
The port is simple with only two 5K1 resistors for USB power negotiation on both sides.
Voltage regulator
The voltage regulator includes one TLV75533PDRV from TI and decoupling capacitors on power ins and outs. And the reset pin is tied to power to keep the chip on while the board has power.
Overall
The PCB is extremely messy.
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C3, C4, C7, C8, C9, C10, C11 |
| 4 | 12K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4, R5, R6, R8 |
| 4 | 5K1 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R10, R11 |
| 4 | D_Schottky | Diode_SMD:D_SOD-123 | D1, D2, D3, D4 |
| 2 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R9 |
| 2 | 2N3904 | Package_TO_SOT_THT:TO-92S | Q1, Q2 |
| 2 | Conn_01x20_Pin | Connector_PinHeader_2.54mm:PinHeader_1x20_P2.54mm_Vertical | J3, J4 |
| 2 | FerriteBead | Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | FB1, FB2 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_EVQP2_MiddlePushTravel_H2.5mm | SW1, SW2 |
| 2 | USB_C_Receptacle_USB2.0_14P | Connector_USB:USB_C_Receptacle_Amphenol_12401610E4-2A | J1, J2 |
| 1 | 4.7K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | BME680 | Package_LGA:Bosch_LGA-8_3x3mm_P0.8mm_ClockwisePinNumbering | U7 |
| 1 | ESP32-S3-WROOM-2 | RF_Module:ESP32-S3-WROOM-2 | U1 |
| 1 | FT231XQ | Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm | U9 |
| 1 | MPU-9250 | Sensor_Motion:InvenSense_QFN-24_3x3mm_P0.4mm | U8 |
| 1 | RJ45 | Connector_RJ:RJ45_Amphenol_54602-x08_Horizontal | J6 |
Questions
How big is the Scrapped PCB?
It measures 72.5 × 53 mm and has 6 copper layers, 2.22 mm thick.
What parts does the Scrapped use?
38 parts, built around the BME680, FT231XQ-R, AMS1117-3.3 and MPU-9250. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Scrapped KiCad files?
From the matarga/simple-devboard repository on GitHub, at the commit this page was made from: the board is CAD/Kicad/scrapped/rev1/Kicad.kicad_pcb and its schematic CAD/Kicad/Kicad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Scrapped design in my own project?
Its repository states no licence, so its author keeps all rights: ask matarga before reusing the design.
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