Yo! This project is still a Work In Progress. Instructions, board layouts and BOM might change!
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A Small STM32F103C8T6 board with all functional pins exposed. Similar to the BluePill board except:
- no regulator. Will be powered by 2 AA batteries.
- no USB
- No LED
- No BOOT0/BOOT1 jumper pins. BOOT0 can be pulled high by a button, BOOT1 is pulled low permanently but exposed by a PIN.
- smaller crystals
- RFM69CW + RFM69(H)W + RFM69HCW footprints + u.FL connector
- VBAT can be disconnected from VCC by cutting the solder jumper on the back.
The size is 36.56mm x 20.32mm. 5 mils trace width and clearance. 20 mils edge clearance.
Tested succesfully V3 with jlcpcb order. Test failed with V3.4 pcbs.io order due to imposed edge clearance. Should be corrected as of V4.3
Top view
Bottom view
Versions history:
- V1: was never released because it was faulty and had less pins exposed.
- V2: had full pin availability but the layout was messy.
- V3: is V2 + u.FL connector + better layout and clearer markings.
- V3.3: corrected mislabeling + moved board edges to fit on breadboard (only sides).
- V3.4: moved labels so they are still visible when headers are soldered on. Optimized a few traces. Changed custom button footprint to RS282G05A3 buttons.
- as of V4 detailed history is tracked in git log.
- V5: Added RFM69(H)W footprints. Cleaned up git. Cleaned up tracks, fab layer, silk screen.
| Id | Designator | Package | Quantity | Designation | Supplier and ref |
|---|---|---|---|---|---|
| 13 | C1 | C_0603_1608Metric | 1 | 1uF | Any |
| 14 | C2,C3,C4,C5 | C_0603_1608Metric | 4 | 0.1uF | Any |
| 15 | C6 | C_0603_1608Metric | 1 | 10uF | Any |
| 16 | C7 | C_0603_1608Metric | 1 | 100nF | Any |
| 17 | C8,C9 | C_0603_1608Metric | 2 | 10pF | Any |
| 9 | J1 | PinSocket_1x08_P2.54mm_Vertical_Clear | 1 | Conn Side | Any, optional |
| 11 | J2 | PinHeader_1x12_P2.54mm_Vertical_Clear | 1 | Conn Down | Any, optional |
| 4 | J3 | PinHeader_1x12_P2.54mm_Vertical_Clear | 1 | Conn Up | Any, optional |
| 10 | J4 | PinSocket_1x08_P2.54mm_Vertical_Clear | 1 | Conn Prog | Any, optional |
| 20 | J5 | U.FL_Molex_MCRF_73412-0110_Vertical | 1 | u.FL | https://www.aliexpress.com/item//32872904554.html |
| 21 | JP1 | SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | 1 | VBAT Jumper | None, part of the pcb |
| 3 | R1,R2 | R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | 2 | 10K | Any |
| 2 | R4,R3 | R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | 2 | 100K | Any |
| 12 | SW1 | SW_SPST_CK_RS282G05A3 | 1 | SW_Reset | https://www.aliexpress.com/item//32672806661.html |
| 1 | SW2 | SW_SPST_CK_RS282G05A3 | 1 | SW_BOOT | https://www.aliexpress.com/item//32672806661.html |
| 18 | U1 | LQFP-48_7x7mm_P0.5mm | 1 | STM32F103C8Tx | STM32F103C8T6 or STM32F103CBT6 |
| 5 | U2 | RFM69CW-XXXS2-MINPADS | 1 | RFM69CW | HopeRF RFM69CW |
| 7 | U3 | HOPERF_RFM69HW-MINPADS | 1 | RFM69HW | HopeRF RFM69HW or RFM69W |
| 6 | U4 | RFM69HCW-XXXS2-MINPADS | 1 | RFM69HCW | HopeRF RFM69HCW |
| 19 | Y1 | Seeedstudio-32kHz_Crystal-FC135 | 1 | 32768 Crystal | https://www.aliexpress.com/item//32861665912.html |
| 8 | Y2 | Resonator_SMD_muRata_CSTxExxV-3Pin_3.0x1.1mm | 1 | 8Mhz | https://www.aliexpress.com/item//32450966424.html |
| Name | Size | # Downloads |
|---|---|---|
| schema.pdf | 108.06 kB | 420 |
| STM32_Sensor.drl | 2.13 kB | 356 |
| STM32_Sensor-B.Mask.gbs | 2.84 kB | 382 |
| STM32_Sensor-F.SilkS.gto | 40.12 kB | 364 |
| STM32_Sensor-F.Paste.gtp | 57.37 kB | 371 |
| STM32_Sensor-F.Mask.gts | 58.56 kB | 417 |
| STM32_Sensor-F.Cu.gtl | 205.72 kB | 390 |
| STM32_Sensor-Edge.Cuts.gm1 | 761 B | 398 |
| STM32_Sensor-B.SilkS.gbo | 49.96 kB | 361 |
| STM32_Sensor-B.Paste.gbp | 1.47 kB | 385 |
| STM32_Sensor-B.Cu.gbl | 117.1 kB | 387 |
| STM32_Sensor.kicad_pcb | 266.13 kB | 408 |
| STM32_Sensor.sch | 25.33 kB | 396 |