Main Board
About the Main Board
Main Board is an open source STM32 PCB design by Terrapin-Rocket-Team, published on GitHub. It is a 4-layer board measuring 71 × 66 mm, with 87 components from 49 distinct parts.
Its main chip is the MS5611-01BA, from the STM32 family. Other key parts include the BMI088, H3LIS331DL, BQ25185DLHR and SAM-M10Q-00B. By type, the board carries 30 capacitors, 26 resistors, 13 connectors, 8 diodes, 5 ICs and 2 inductors.
From the project
Code and PCBs for the avionics subteam for the SRAD flight computer and side projects
The avionics subteam manages this repo, as well as the Multi-Mission-Flight-Software and Ground Station repositories. Look at the Issues tab for tasks that need to be done, and the Projects tab for the current status of the Avionics subteam as a whole.
Most of our development for our competition rocket systems will be within the /Spaceport/ directory. Here, the parts are broken up by whether they are hardware, PCBs, or code.
Main components on the Main Board
Main Board bill of materials (BOM)
87 components, 49 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MS5611-01BA STM32H7A3ZITx | LQFP-144_20x20mm_P0.5mm | U1 |
| 1 | BMI088 IS66WVS4M8BLL-104NLI | SOIC8_150MIL_N_ISI-M | U2 |
| 1 | H3LIS331DL TPS63900 | WSON-10-1EP_2.5x2.5mm_P0.5mm_EP1.2x2mm_ThermalVias | U3 |
| 1 | BQ25185DLHR | WSON10_DLH_TEX-M | U4 |
| 1 | SAM-M10Q-00B USBLC6-2P6 | SOT-666 | U5 |
| 1 | ECS-2520S 16Mhz | Crystal_SMD_Abracon_ABM10-4Pin_2.5x2.0mm | Y1 |
| 1 | Micro_SD_Card_Det1 | CONN9_MSD-1_CUD | J1 |
| 2 | CONN_01X02 I2C1 | PinHeader_1x04_P2.54mm_Vertical | J2, J3 |
| 1 | USB_C_RECEPTACLE_USB2.0_16P I2C1 | PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | I2C2 | PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | SWD | PinHeader_2x03_P2.54mm_Vertical | J6 |
| 1 | I2C GPIO | PinHeader_2x11_P2.54mm_Vertical | J7 |
| 1 | SPI | PinHeader_2x03_P2.54mm_Vertical | J8 |
| 1 | 3.3VOUT USART1 | PinHeader_1x05_P2.54mm_Vertical | J9 |
| 1 | 5.0VOUT USART2 | PinHeader_1x05_P2.54mm_Vertical | J10 |
| 1 | USB_C_Plug_USB2.0 | USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J11 |
| 1 | BAT_TERM | TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J12 |
| 1 | CONN_01X02 SW_TERM | TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J13 |
| 1 | Buzzer | Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | Open | PinHeader_2x01_P2.54mm_Vertical | JP1 |
Show 29 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SD_LED | LED_0805_2012Metric | D1 |
| 1 | ESDA5V3L FLIGHT_LED | LED_0805_2012Metric | D2 |
| 1 | SENSOR_LED | LED_0805_2012Metric | D3 |
| 1 | RADIO_LED | LED_0805_2012Metric | D4 |
| 1 | BAT_GRN_LED | LED_0805_2012Metric | D5 |
| 1 | BAT_RED_LED | LED_0805_2012Metric | D6 |
| 1 | USB_LED | LED_0805_2012Metric | D7 |
| 1 | PWR_LED | LED_0805_2012Metric | D8 |
| 1 | 120R | L_0805_2012Metric | FB1 |
| 1 | 2.2UH 2u2 | L_0805_2012Metric | L1 |
| 3 | 10u | C_0805_2012Metric | C1, C28, C29 |
| 16 | 100n | C_0805_2012Metric | C2, C3, C4, C5, C6, C7, C11, C13 +8 |
| 5 | 1u | C_0805_2012Metric | C8, C9, C12, C26, C27 |
| 1 | 10n | C_0805_2012Metric | C10 |
| 2 | ?? | C_0805_2012Metric | C21, C22 |
| 2 | 2u2 | C_0805_2012Metric | C24, C25 |
| 1 | 22u | C_0805_2012Metric | C30 |
| 9 | 10k | R_0805_2012Metric | R1, R2, R3, R5, R6, R15, R18, R19 +1 |
| 1 | 100k | R_0805_2012Metric | R7 |
| 6 | ?? | R_0805_2012Metric | R8, R9, R10, R11, R22, R25 |
| 1 | 15K ?? | R_0805_2012Metric | R12 |
| 1 | 111K ?? | R_0805_2012Metric | R13 |
| 1 | 28.7K 10k | R_0805_2012Metric | R14 |
| 1 | 500K 10k | R_0805_2012Metric | R16 |
| 1 | 100K 10k | R_0805_2012Metric | R17 |
| 2 | 5k1 | R_0805_2012Metric | R20, R21 |
| 1 | 13k | R_0805_2012Metric | R24 |
| 1 | 600R | R_0805_2012Metric | R26 |
| 1 | 60K 16k2 | R_0805_2012Metric | R27 |
Main Board design files
The KiCad project lives in the Terrapin-Rocket-Team/SRAD-Avionics repository on GitHub; these links point at the commit this page was built from.
Main Board: common questions
What microcontroller does the Main Board use?
The Main Board is built around the MS5611-01BA, from the STM32 family.
How big is the Main Board?
The Main Board measures 71 × 66 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Main Board?
87 components, from 49 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 Main Board design files?
From the Terrapin-Rocket-Team/SRAD-Avionics 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 Main Board design in my own project?
The repository has no license, so all rights stay with Terrapin-Rocket-Team. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Main Board 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.
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