Freyja gcs
aesirkth·freyja-gcs·electronics/freyja-gcs-pcb/design/freyja-gcs-pcb.kicad_pcb
About the Freyja gcs PCB
Freyja gcs is an open source STM32 PCB design by aesirkth, published on GitHub. It is a 4-layer board measuring 300 × 200 mm, with 281 components from 72 distinct parts.
Its main chip is the STM32U575RGTx, from the STM32 family. Other key parts include the SN65HVD232DR, FM7021DB, CN3702, HY2213-BB3A and IP2721. By type, the board carries 77 resistors, 60 diodes, 54 capacitors, 26 transistors, 14 ICs and 14 switches.
It belongs with the rf & radio and sensors designs in this gallery.
From the project
freyja ground control station
freyja ground control station. talks with launchpad controller surtr over lora through brage and to fjaelar over brage.
We need two code bases. One Zephyr application that runs on the GCS PCB (PCB APP). And one Python Raspberry Pi app (RPI APP) for displaying and managing the telemetry data.
Specs: - Zephyr - Talks with rocket and pad control through brage over CAN FD - USB CDC to send data to RPI. Choose appropriate serialization format. - Sends valve toggle position only when send button has been pressed. - Shows status of valve on led.

Main components on the Freyja gcs
Freyja gcs bill of materials (BOM)
281 components, 72 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32U575RGTx | LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | SN65HVD232DR | SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL | U2 |
| 1 | FM7021DB | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | U3 |
| 1 | CN3702 | TSSOP-16_L5.0-W4.4-P0.65-LS6.4-BL | U4 |
| 2 | HY2213-BB3A | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | U5, U6 |
| 1 | IP2721 | TSSOP-16_L5.0-W4.4-P0.65-LS6.4-BL | U7 |
| 1 | SY8368AQQC | QFN-12_L3.0-W3.0-P0.45-TL-EP | U8 |
| 2 | LM74700QDBVRQ1 | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL | U9, U10 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U11 |
| 1 | RY3730 | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL | U12 |
| 2 | 74HC595 | SOIC-16_L9.9-W3.9-P1.27-LS6.0-BL | U13, U14 |
| 5 | XR15N06Q | SOT-89-3_L4.5-W2.5-P1.50-LS4.2-BR | Q1, Q2, Q6, Q7, Q8 |
| 3 | AO4459 | SOP-8_L5.0-W4.0-P1.27-LS6.2-BL | Q3, Q24, Q25 |
| 2 | L2N7002SLLT1G | SOT-23-3_L3.0-W1.7-P0.95-LS2.9-BR | Q4, Q5 |
| 16 | NPN | SOT-416_L1.6-W0.8-P1.00-LS1.6-BR | Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16 +8 |
| 1 | 48MHz | CRYSTAL-SMD_4P-L2.0-W1.6-BL_HUAXIN_CN4 | Y1 |
| 1 | 32768Hz | OSC-TH_BD1.9-P0.70 | Y2 |
| 2 | GT-USB-7010ASV | USB-C-SMD_G-SWITCH_GT-USB-7010ASV | J1, J6 |
| 1 | JST SR | JST_SH_SM06B-SRSS-TB_1x06-1MP_P1.00mm_Horizontal | J2 |
| 1 | 2x20F | PinSocket_2x20_P2.54mm_Vertical | J3 |
Show 52 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | JST SH | CONN-SMD_AFC10-S04QCA-00 | J4, J5 |
| 1 | A2543WR-4P-2 | CONN-TH_PHD2-4P-2.54 | J7 |
| 1 | XD-PH-10AW | CONN-TH_10P-P2.00_HCTL_PH-10AW | J8 |
| 1 | JS350-S02DCA-00 | CONN-SMD_JS350-S02DCA-00 | J9 |
| 1 | XT60PB-M.G.Y | CONN-TH_XT60PB-M | J10 |
| 1 | XT60PB-F.G.Y | CONN-TH_XT60PB-F.G.Y | J11 |
| 1 | CR2032 | BAT-TH_BS-2-1 | BT1 |
| 4 | BH-18650-B1BA002 | BATTERY-SMD_18650-1S-L77.1-W20.7-1 | BT2, BT3, BT4, BT5 |
| 1 | 24V 3A Hold 5A Trip | F1812 | F1 |
| 4 | M2.5 12mm | SMTSO25120 | H1, H2, H3, H4 |
| 9 | M2.5 12mm | SMTSO25100 | H5, H6, H7, H8, H9, H10, H11, H12 +1 |
| 2 | SW_SPST | SW_SPST_PTS647_Sx38 | SW1, SW2 |
| 1 | K6-6136D-L1-04 | SW-TH_K6-6136D-L1-04 | SW3 |
| 3 | PB22E09071 | SW-TH_6P-L8.5-W8.5-P2.54-LS5.5 | SW4, SW7, SW10 |
| 8 | 2MS1T1B1M2QES | SW-TH_2MS1T1B1M2QES-5 | SW5, SW6, SW8, SW9, SW11, SW12, SW13, SW14 |
| 1 | SN430281N | LED-SEG-TH_10P-L15.0-W10.0-P2.54-S7.40-BL | DS1 |
| 32 | 0603ESDA-05N | D_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8 +24 |
| 14 | Green | LED-TH_BD5.9-P2.54-RD_GREEN | D13, D32, D33, D37, D38, D42, D43, D47 +6 |
| 3 | Yellow | LED-TH_BD5.9-P2.54-RD_GREEN | D14, D51, D53 |
| 2 | PMEG3050EP | SOD-128_L3.7-W2.5-LS4.7-RD | D17, D18 |
| 2 | PESD2IVN24-TR | TO-236AB_L2.9-W1.3-P0.95-LS2.3-BR | D20, D60 |
| 1 | Red | LED0603-RD_RED | D21 |
| 3 | PSBD1DF40V2L | SOD-123FL_L2.8-W1.8-LS3.8-RD | D25, D30, D59 |
| 2 | Green | LED0603-RD_GREEN | D26, D31 |
| 1 | Red | LED-TH_BD5.9-P2.54-RD_GREEN | D55 |
| 2 | 22u | IND-SMD_FCH1350-220M | L1, L3 |
| 1 | 2u2 | IND-SMD_L13.5-W12.6 | L2 |
| 2 | 18p | C_0603_1608Metric | C1, C3 |
| 2 | 25p | C_0603_1608Metric | C2, C4 |
| 1 | 4u7 | C_0603_1608Metric | C5 |
| 23 | 100n | C_0603_1608Metric | C6, C7, C8, C9, C10, C11, C17, C19 +15 |
| 11 | 22u | C1210 | C12, C13, C14, C15, C29, C38, C39, C40 +3 |
| 2 | 100p | C_0603_1608Metric | C16, C18 |
| 1 | 470n | C_0603_1608Metric | C20 |
| 6 | 2u2 | C_0603_1608Metric | C23, C30, C31, C37, C46, C48 |
| 1 | 220n | C_0603_1608Metric | C24 |
| 5 | 22u | C2220 | C26, C27, C28, C44, C49 |
| 4 | 5k1 | R_0603_1608Metric | R1, R2, R19, R20 |
| 14 | 120 | R_0603_1608Metric | R3, R10, R25, R39, R40, R45, R46, R51 +6 |
| 18 | 10k | R_0603_1608Metric | R8, R9, R14, R26, R30, R41, R42, R43 +10 |
| 1 | 2k2 | R_0603_1608Metric | R11 |
| 6 | 390 | R_0603_1608Metric | R12, R13, R21, R22, R33, R36 |
| 5 | 560 | R_0603_1608Metric | R15, R16, R31, R77, R78 |
| 3 | 0 | R_0603_1608Metric | R17, R79, R80 |
| 1 | 1M | R_0603_1608Metric | R18 |
| 3 | 100 | R_0603_1608Metric | R23, R24, R38 |
| 1 | 68m | R_2512_6332Metric_Pad1.40x3.35mm_HandSolder | R27 |
| 2 | 39 | R_0603_1608Metric | R28, R29 |
| 4 | 100k | R_0603_1608Metric | R32, R34, R67, R68 |
| 1 | 13k | R_0603_1608Metric | R35 |
| 1 | 680m | R_1206_3216Metric | R37 |
| 13 | 220 | R_0603_1608Metric | R60, R62, R64, R65, R69, R70, R71, R72 +5 |
Freyja gcs design files
The KiCad project lives in the aesirkth/freyja-gcs repository on GitHub; these links point at the commit this page was built from.
Freyja gcs: common questions
What microcontroller does the Freyja gcs use?
The Freyja gcs is built around the STM32U575RGTx, from the STM32 family.
How big is the Freyja gcs PCB?
The Freyja gcs measures 300 × 200 mm, has 4 copper layers and is 1.61668 mm thick.
How many components are on the Freyja gcs?
281 components, from 72 distinct parts. The full bill of materials is listed on this page.
Where can I download the Freyja gcs design files?
From the aesirkth/freyja-gcs repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Freyja gcs design in my own project?
The repository has no license, so all rights stay with aesirkth. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Freyja gcs without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
Similar boards
STM32
LumenPnP Motherboard
opulo-inc
149 × 95 mm296 parts4LCC-BY-SA-4.03.7kSTM32
AxxSolder
AxxAxx
39 × 82.5 mm122 parts2LGPL-3.01.7kSTM32
LibreVNA
jankae
122 × 98 mm592 parts6LGPL-3.01.6kSTM32
AIOC
skuep
21 × 31.5 mm47 parts2LMIT1.4kSTM32
Ferris
pierrechevalier83
208.8 × 86.8 mm102 parts2LSHL-2.11.3kSTM32
176 pin board
rusefi
61.8 × 73.2 mm76 parts2LGPL-3.01.2k