Observer
About the Observer PCB
Observer is an open source PCB design by Stab-Rabbit-coding, published on GitHub under the CERN-OHL-W-2.0 license. It is a 4-layer board measuring 69.9 × 56.4 mm, with 43 components from 26 distinct parts.
Other key parts include the Microchip KSZ9477, TI MSPM0G3519-Q1, TI ISOW1044BDFMR and Infineon SLB 9672AU2.0. By type, the board carries 10 transformers, 4 ICs, 2 resistors, 1 transistor, 1 crystal and 1 diode.
From the project
A functional, security conscious, Unmanned Aerial Vehicle based on the Firefly Class spacecraft Serenity from the 2002 show..
This directory holds the KiCad projects for the four cape/board types:
Per-board net/pin documentation lives in the matching .md files (Pilot.md, TACCO.md, FlightEngineer.md, XCVR-49MHZ-2.md). KiCad files keep KiCad board coordinates (documented exception to the hull-frame standard, see root AGENTS.md).
A pass was made to wire in a second Ethernet channel and to clear the Design-Rule-Check (DRC) and ratsnest issues introduced by a manual component rearrangement. This section records exactly what landed and what is still open, so the thread can be picked up cleanly.
Main components on the Observer
Observer bill of materials (BOM)
43 components, 26 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Microchip KSZ9477 | TQFP-128-1EP_KSZ9477_14x14mm_P0.4mm_EP10x10 | U2 |
| 1 | TI MSPM0G3519-Q1 | VQFN-48-1EP_7x7mm_P0.5mm_EP4.1x4.1mm | U3 |
| 1 | TI ISOW1044BDFMR | SOIC-20W_7.5x12.8mm_P1.27mm | U4 |
| 1 | Infineon SLB 9672AU2.0 | QFN-32-1EP_5x5mm_P0.5mm_EP3.6x3.6mm | U5 |
| 1 | AO3400 logic-level N-MOSFET | SOT-23 | Q1 |
| 1 | 25MHz | Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | SRF2012-100Y (CAN) | L_CommonModeChoke_Coilcraft_0805USB | CMC5 |
| 2 | 1uF | C_0402_1005Metric | C_2V5I, C_2V5O |
| 1 | CSI CLK/D0 | JST_GH_BM04B-GHS-TBT_1x04-1MP_P1.25mm_Vertical | J_CAM1 |
| 1 | CAM SDA/SCL/RST/3V3 | JST_GH_BM04B-GHS-TBT_1x04-1MP_P1.25mm_Vertical | J_CAM2 |
| 4 | — | MH1, MH2, MH3, MH4 | |
| 2 | R_fbbot | R_0402_1005Metric | R_FB1B, R_FB3B |
| 2 | R_fbtop | R_0402_1005Metric | R_FB1T, R_FB3T |
| 2 | 100k | R_0402_1005Metric | R_PG1, R_PG3 |
| 2 | Wurth 749010012A | Wurth_749010012A_10-100BASE-TX | T1, T2 |
| 4 | SRF2012-100Y | L_CommonModeChoke_Coilcraft_0805USB | T1_CMC1, T1_CMC2, T2_CMC1, T2_CMC2 |
| 4 | PRTR5V0U2X | SOT-363_SC-70-6 | T1_D1, T1_D2, T2_D1, T2_D2 |
| 1 | TLV62569 -> +1V2 | SOT-23-6 | U_REG_1V2 |
| 2 | 10uF | C_0402_1005Metric | U_REG_1V2_CI, U_REG_3V3_CI |
| 2 | 22uF | C_0402_1005Metric | U_REG_1V2_CO, U_REG_3V3_CO |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 2.2uH | L_Taiyo-Yuden_NR-20xx | U_REG_1V2_L, U_REG_3V3_L |
| 1 | TLV75725 -> +2V5 | SOT-23-5 | U_REG_2V5 |
| 1 | TLV62569 -> +3V3 | SOT-23-6 | U_REG_3V3 |
| 1 | PRTR5V0U2X (CAN) | SOT-363_SC-70-6 | D5 |
| 1 | 100R gate | R_0402_1005Metric | R1 |
| 1 | 10k pulldown | R_0402_1005Metric | R2 |
Observer design files
The KiCad project lives in the Stab-Rabbit-coding/Serenity-UAV repository on GitHub; these links point at the commit this page was built from.
Observer: common questions
How big is the Observer PCB?
The Observer measures 69.9 × 56.4 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Observer?
43 components, from 26 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Observer design files?
From the Stab-Rabbit-coding/Serenity-UAV repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Observer design in my own project?
Yes, under the terms of its CERN-OHL-W-2.0 license, which Stab-Rabbit-coding chose for the repository.
More boards in Serenity-UAV
Flight Engineer — Power Distribution Board
90 × 65 mm115 parts4LCERN-OHL-W-2.01
TACCO — Comms / Logging / Payload Cape
55 × 35 mm108 parts6LCERN-OHL-W-2.01
Pilot — EMI-Hardened Flight Control & Sensor Cape
55 × 35 mm96 parts6LCERN-OHL-W-2.01
XCVR-49MHZ-2 EMI-Hardened 49 MHz AX.25 KISS Transceiver
55 × 35 mm41 parts4LCERN-OHL-W-2.01
CAN-PERIPH-GW-1 / MAL-CAN-PERIPH-GW
64.3 × 19.5 mm39 parts2LCERN-OHL-W-2.01
ENC-NACELLE-1 / SKIPPER-TILT-ENC
7 × 14 mm4 parts2LCERN-OHL-W-2.01