Mainboard
Mainboard is an open source STM32 PCB design by eddyem: a 2-layer, 58 × 35 mm board with 86 components (52 distinct parts). It is built around the BME280, STM32F303CBT6, ISO1050DUB, 74HC4051. Filed under sensors.
Code samples and ready projects based on bare-metal STM32
This firmware implements an infrared all-sky camera system based on up to five MLX90640 thermal imaging sensors (32×24 pixels each), designed for cloud monitoring at the Special Astrophysical Observatory of the Russian Academy of Sciences. The system automates sky quality assessment for 0.5-meter telescopes of the "Astro-M" complex.
The device continuously captures thermal images from multiple sensors (Zenith, East, South, West, North), processes environmental data from a BMP280 pressure/humidity/temperature sensor, and controls PWM heaters to prevent dew formation on optics.
Built around
Parts list
86 components, 52 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BME280 PC817 | DIP-4_W7.62mm | U1 |
| 1 | STM32F303CBT6 PC817 | DIP-4_W7.62mm | U2 |
| 1 | ISO1050DUB IP4220CZ6 | SOT-23-6 | U3 |
| 1 | 74HC4051 USBLC6-2SC6 | SOT-23-6 | U4 |
| 1 | 74HC4051 STM32F303CBTx | LQFP-48_7x7mm_P0.5mm | U5 |
| 1 | B0505S-1W B1203S-1W | B0x0xS | Q1 |
| 1 | B0509S-1W B1212S-1W | B0x0xS | Q2 |
| 1 | SI2308 SI2300 | SOT-23_Handsoldering | Q3 |
| 1 | 8MHZ NX5032GA-8MHz | Crystal_SMD_5032-2Pin_5.0x3.2mm | Y1 |
| 1 | Conn_01x03_Pin | TerminalBlock_Phoenix_MKDS-1,5-3_1x03_P5.00mm_Horizontal | J1 |
| 1 | Conn_01x03_Pin | TerminalBlock_Phoenix_MKDS-1,5-4_1x04_P5.00mm_Horizontal | J2 |
| 1 | Conn_01x04_Pin | PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | Conn_01x04_Socket | PinHeader_1x06_P2.54mm_Vertical | J4 |
| 2 | ~ | JST_PH_B6B-PH-K_1x06_P2.00mm_Vertical | J5, J6 |
| 7 | Conn_01x04_Socket | JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J7, J8, J10, J11, J12, J13, J14 |
| 1 | RS-485 Conn_01x04_Socket | JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J9 |
| 1 | Prog | PinSocket_1x06_P1.27mm_Vertical | J15 |
| 1 | SE83-75X | SE83-GDS | GD1 |
| 1 | 50K 30V | S10K30 | RV1 |
| 1 | SMAJ15CA | D_SMA | D1 |
Show 32 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | SP0504BAHT | SOT-23-5 | D2, D3 |
| 2 | CESD3V3 | D_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D4, D5 |
| 1 | MM3Z3V6 | D_SOD-323F | D6 |
| 1 | 100U 2uH | L_CommonMode_Wuerth_WE-CMB-S | L1 |
| 4 | 0.1 1u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C4, C11 |
| 2 | 1u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C14 |
| 1 | 10u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5 |
| 1 | 0.1 10u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 2 | 0.1 | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C7, C8 |
| 6 | 0.1 | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9, C10, C12, C15, C17, C18 |
| 2 | 6 | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C13, C16 |
| 1 | 10K x | R_2010_5025Metric_Pad1.40x2.65mm_HandSolder | R1 |
| 1 | 4K7 x | R_2010_5025Metric_Pad1.40x2.65mm_HandSolder | R2 |
| 4 | 330 x | R_2010_5025Metric_Pad1.40x2.65mm_HandSolder | R3, R4, R5, R6 |
| 2 | 330 20k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R8 |
| 2 | 330 100k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9, R10 |
| 1 | 330 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R11 |
| 1 | 4K7 330 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12 |
| 2 | 3K3 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13, R14 |
| 3 | 3K3 110 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15, R16, R17 |
| 1 | 3K3 330 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R18 |
| 2 | 3K3 1k 0.1% | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R19, R20 |
| 1 | 560 270 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R21 |
| 1 | 560 1k 0.1% | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R22 |
| 1 | 120 1k 0.1% | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R23 |
| 4 | 560 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R24, R25, R26, R27 |
| 2 | 560 22 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R28, R29 |
| 1 | 1K5 1k5 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R30 |
| 1 | 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R31 |
| 1 | 470 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R32 |
| 1 | 10M 22 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R33 |
| 2 | 330 | R_Array_Convex_4x0603 | RN1, RN2 |
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