Chiller control
Chiller control is an open source STM32 PCB design by eddyem: a 2-layer, 62 × 60.5 mm board with 69 components (44 distinct parts). It is built around the BME280, STM32F303CBT6, ISO1050DUB, 74HC4051. Filed under sensors.
Code samples and ready projects based on bare-metal STM32
UART: 115200N1, not more than 100ms between data bytes in command To turn ON human terminal (without timeout) send "####"
Protocol: [ command line ] '[' clears earlier input '\n', '\r', ' ', '\t' are ignored All messages are asynchroneous!
Commands: Ax - turn on(x=1)/off(x=0) external alarm or check its value Cx - set cooler PWM to x d - (only when EBUG defined) go into debug commands F - get flow sensor rate for 5s period Hx - set heater PWM to x L - check water level sensor value Px - set pump PWM to x R - reset MCU Tx - get NTC temperature for channel x t - get MCU temperature V - get…
Built around
Parts list
69 components, 44 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BME280 LM1117-3.3 | SOT-223 | U1 |
| 1 | STM32F303CBT6 MAX3232 | SOIC-16_3.9x9.9mm_Pitch1.27mm | U2 |
| 1 | ISO1050DUB STM32F030F4Px | TSSOP-20_4.4x6.5mm_Pitch0.65mm | U3 |
| 1 | 74HC4051 L7805 | TO-220-3_Vertical | U4 |
| 1 | B0505S-1W SI2300 | SOT-23_Handsoldering | Q1 |
| 1 | B0509S-1W SI2300 | SOT-23_Handsoldering | Q2 |
| 1 | SI2308 SI2300 | SOT-23_Handsoldering | Q3 |
| 1 | B2424S-2W IRL3303 | TO-220-3_Vertical | Q4 |
| 1 | B0505S-2W IRL3303 | TO-220-3_Vertical | Q5 |
| 1 | DB9_Female | DB9-F | J1 |
| 1 | 12VIN | TerminalBlock_Pheonix_MKDS1.5-2pol | J2 |
| 2 | DC3-10P | IDC-Header_2x05_P2.54mm_Vertical | J3, J4 |
| 1 | Cooler | TerminalBlock_Pheonix_MKDS1.5-2pol | J5 |
| 1 | Heater | TerminalBlock_Pheonix_MKDS1.5-2pol | J6 |
| 1 | Pump | TerminalBlock_Pheonix_MKDS1.5-2pol | J7 |
| 1 | Buzzer | Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | SW_DIP_X01 Reset | SW_SPST_FSMSM | SW1 |
| 1 | SW_DIP_X04 Boot | SW_SPST_FSMSM | SW2 |
| 1 | Val** | hole_3mm | hole_3mm |
| 1 | SS14 | D_SMA_Handsoldering | D1 |
Show 24 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 100U BMBA 0.1mH | R_0805_HandSoldering | L1 |
| 3 | 0.1 | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C1, C2, C8 |
| 9 | 0.1 | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C3, C5, C9, C12, C17, C18, C19, C20 +1 |
| 1 | 0.1 47u | CP_Tantalum_Case-A_EIA-3216-18_Hand | C4 |
| 1 | 0.1 1u | C_0805_HandSoldering | C6 |
| 1 | 0.1 10u | C_1206_HandSoldering | C7 |
| 2 | 0.47 | C_0805_HandSoldering | C10, C13 |
| 1 | 0.1 0.47 | C_0805_HandSoldering | C11 |
| 2 | 1u | C_0805_2012Metric_Pad1.29x1.40mm_HandSolder | C14, C16 |
| 1 | 100u | CP_Radial_D8.0mm_P3.50mm | C15 |
| 1 | 10K 10k | R_0603_HandSoldering | R1 |
| 1 | 4K7 1k0.1% | R_0805_HandSoldering | R2 |
| 3 | 330 1k0.1% | R_0805_HandSoldering | R3, R4, R5 |
| 3 | 330 10k | R_0603_HandSoldering | R6, R8, R9 |
| 1 | 330 220 | R_0805_2012Metric_Pad1.29x1.40mm_HandSolder | R7 |
| 1 | 330 510 | R_0603_HandSoldering | R10 |
| 1 | 330 220 | R_0805_HandSoldering | R11 |
| 1 | 4K7 10k | R_0603_HandSoldering | R12 |
| 5 | 3K3 10k | R_0603_HandSoldering | R13, R14, R15, R19, R20 |
| 3 | 3K3 510 | R_0603_HandSoldering | R16, R17, R18 |
| 1 | 560 10k | R_0603_HandSoldering | R21 |
| 2 | 560 220 | R_0805_2012Metric_Pad1.29x1.40mm_HandSolder | R22, R26 |
| 1 | 120 220 | R_0805_2012Metric_Pad1.29x1.40mm_HandSolder | R23 |
| 2 | 560 0 | R_0805_2012Metric_Pad1.29x1.40mm_HandSolder | R24, R25 |
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