4 layers117.5 × 30 mm
4 layers117.5 × 30 mm
4reel ee
o7-machinehum/4reel34Stereo machine vision camera for outdoor mobile robotics.
- Size
- 117.5 × 30 mm
- Copper layers
- 4
- Thickness
- 1.56 mm
- Parts
- 153
- Nets
- 146
- Pads
- 629
- Tracks, vias
- 2,028, 383
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 21 Jul 2026
- Updated
- 11 Oct 2026
Overview
4reel ee is an open-source printed circuit board by o7-machinehum, from the o7-machinehum/4reel repository on GitHub, published under the MIT licence. It is a 4-layer board of 117.5 × 30 mm with 153 parts on 146 nets, routed with 2,028 tracks and 383 vias.
It is built around the RV1103G1, GD25Q128EWIGY and DM3AT-SF-PEJM5, with the OV9281, EA3036CQBR and LIS2HH12 among its other parts. Its parts include 75 capacitors, 30 resistors, 9 ICs, 9 inductors and 4 connectors.
Main components
12
RV1103G1
QFN-88(9x9)QFN-88(9x9) Microcontrollers (MCU/MPU/SOC) ROHSRockchipMicrocontrollers (MCU/MPU/SOC)
GD25Q128EWIGY
WSON8(5x6)WSON8(5x6) NOR FLASH ROHSGigaDevice Semicon BeijingNOR FLASH
DM3AT-SF-PEJM5
SMD-25℃~+85℃ 1.68mm Connector and Ejector MicroSD Card (TF Card) No Push-Push SMD SD Card / Memory Card Connector ROHSHirose ElectricSD Card / Memory Card Connector
OV9281
CSP-64CSP-64 New Arrivals ROHSOmniVision TechnologiesUncategorised
EA3036CQBR
WQFN-20-EP(3x3)WQFN-20-EP(3x3) Power Management - Specialized ROHSeveranalogPower Management - Specialized
LIS2HH12
LGA-12(2x2)-40℃~+85℃ 1.71V~3.6V 16bit 5uA Accelerometer SPI、I2C X,Y,Z ±8g LGA-12(2x2) Accelerometers ROHSSTMicroelectronicsAccelerometers
TLV73312PDBV
SOT-23-5-40℃~+125℃@(Tj) 1 1.2V 120uVrms 125mV@(300mA) 300mA 34uA 5.5V 50dB Fixed Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection、Enable SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsTLV73328PDBV
SOT-23-5-40℃~+125℃@(Tj) 1 120uVrms 125mV@(300mA) 2.8V 300mA 34uA 5.5V 50dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection、Soft Start、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TPD2EUSB30ADRTR
SOT(9x3)0.45pF 100nA 14V 3.3V 4.5V ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Unidirectional SOT(9x3) ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
MLP2012S3R3MT0S1
0805247mΩ 3.3uH 900mA Multilayer inductor ±20% 0805 Inductors (SMD) ROHSTDKInductors (SMD)
RC0402FR-0710KL
UncategorisedUnknown maker
DFE252012P-1R5M=P2
10081.5uH 2.6A 3.5A 60mΩ ±20% 1008 Power Inductors ROHSMurataPower Inductors
README
readme.md4reel
4reel is a platform for robots that don't have enough computing power to run machine vision algorithms. It's capable of stereo depth processing, image classification and SLAM.
When connected over USB-C the device will present itself as an Ethernet adapter and DHCP you an IP address, configuration can be done on the web portal at http://192.168.77.1:8080/
The JST connecter can be used to send data UART to an Arduino, ESP32, etc. The same JST conncetor can be used to power the device with 5V.
System Overview
Repo structure
.
|-- img
|-- os
|-- readme.md
|-- ref
|-- rv1103 # Current tested board
|-- rv1106 # Next generation
`-- scripts # Automation scripts I wroteMedia
Parts
153| Qty | Value | Footprint | References |
|---|---|---|---|
| 26 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C14, C15, C16, C18, C24, C28, C31, C36, C37, C41, C42, C45, C49, C51, C52 +10 |
| 22 | 1uF | Capacitor_SMD:C_0402_1005Metric | C29, C30, C33, C34, C35, C39, C40, C43, C44, C46, C47, C48, C55, C56, C57, C58 +6 |
| 20 | 10uF | Capacitor_SMD:C_0402_1005Metric | C2, C3, C4, C5, C10, C12, C13, C17, C19, C20, C21, C22, C23, C25, C26, C27 +4 |
| 6 | 3u3/0.9A | Inductor_SMD:L_0805_2012Metric | L4, L5, L6, L7, L8, L9 |
| 6 | Fiducial | Fiducial:Fiducial_0.5mm_Mask1.5mm | FID1, FID2, FID3, FID4, FID5, FID6 |
| 4 | 10k | Resistor_SMD:R_0402_1005Metric | R8, R17, R18, R26 |
| 4 | 4.7k | Resistor_SMD:R_0402_1005Metric | R11, R12, R21, R22 |
| 4 | M2 | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 4 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP3, TP4, TP5, TP6 |
| 3 | 1.5uH | Inductor_SMD:L_1008_2520Metric | L1, L2, L3 |
| 3 | 100k | Resistor_SMD:R_0402_1005Metric | R4, R6, R9 |
| 3 | 220pF | Capacitor_SMD:C_0402_1005Metric | C6, C8, C11 |
| 2 | 0R | Resistor_SMD:R_0402_1005Metric | R13, R32 |
| 2 | 10nF | Capacitor_SMD:C_0402_1005Metric | C73, C74 |
| 2 | 10pF | Capacitor_SMD:C_0402_1005Metric | C32, C38 |
| 2 | 200k | Resistor_SMD:R_0402_1005Metric | R5, R7 |
| 2 | 22R | Resistor_SMD:R_0402_1005Metric | R16, R19 |
| 2 | 330R | Resistor_SMD:R_0402_1005Metric | R30, R31 |
| 2 | 470R | Resistor_SMD:R_0402_1005Metric | R23, R24 |
| 2 | 47k | Resistor_SMD:R_Array_Concave_4x0402 | RN1, RN2 |
| 2 | 5.6k | Resistor_SMD:R_0402_1005Metric | R14, R15 |
| 2 | Camera_Lens_20mm | ov9281:Camera_Lens_20mm | MP1, MP2 |
| 2 | ImageSensor_OV9281 | ov9281:OV9281 | U3, U9 |
| 2 | LED | LED_SMD:LED_0402_1005Metric | D1, D2 |
| 2 | TXC-7C | Oscillator:Oscillator_SMD_TXC_7C-4Pin_5.0x3.2mm | Y1, Y3 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_1.5x1.5mm | TP1, TP2 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R20 |
| 1 | 22R | Resistor_SMD:R_0201_0603Metric | R27 |
| 1 | 240R | Resistor_SMD:R_0402_1005Metric | R10 |
| 1 | 24Mhz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y2 |
| 1 | 40.2k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 47k | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | 6.04k | Resistor_SMD:R_0402_1005Metric | R25 |
| 1 | 9.1k | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | EA3036C | Package_DFN_QFN:QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm | U2 |
| 1 | GD25Q128EWIGY | Package_SON:WSON-8-1EP_6x5mm_P1.27mm_EP3.4x4.3mm | U7 |
| 1 | LIS2HH12 | Package_LGA:LGA-12_2x2mm_P0.5mm | U8 |
| 1 | Logo_Open_Hardware_Large | Symbol:OSHW-Logo2_14.6x12mm_SilkScreen | SYM1 |
| 1 | Micro_SD_Card_Det2 | Connector_Card:microSD_HC_Hirose_DM3AT-SF-PEJM5 | J2 |
| 1 | RJ45_Hanrun_HR911105A_Horizontal | Connector_RJ:RJ45_Hanrun_HR911105A_Horizontal | J3 |
| 1 | RV1103G | rv1103b:Rockchip_QFN-88-1EP_9x9mm_P0.35mm_EP6.5x6.5mm | U1 |
| 1 | SM04B-SRSS-TB | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J4 |
| 1 | TLV73312PDBV | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | TLV73328PDBV | Package_TO_SOT_SMD:SOT-23-5 | U6 |
| 1 | TPD2EUSB30 | Package_TO_SOT_SMD:Texas_DRT-3 | U5 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
Questions
How big is the 4reel ee PCB?
It measures 117.5 × 30 mm and has 4 copper layers, 1.56 mm thick.
What parts does the 4reel ee use?
153 parts, built around the RV1103G1, GD25Q128EWIGY, DM3AT-SF-PEJM5 and OV9281. 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 4reel ee KiCad files?
From the o7-machinehum/4reel repository on GitHub, at the commit this page was made from: the board is rv1103/4reel_ee.kicad_pcb and its schematic rv1103/4reel_ee.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 4reel ee design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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