Base heating
About the Base heating PCB
Base heating is an open source STM32 PCB design by NerdyProjects, published on GitHub. It is a 2-layer board measuring 65 × 65.1 mm, with 86 components from 43 distinct parts.
Its main chip is the STM32F072C8Tx, from the STM32 family. Other key parts include the MAX3078E, SN65HVD230, AT24CS64-SSHM and MOC3061M. By type, the board carries 30 resistors, 18 connectors, 17 capacitors, 7 transistors, 6 ICs and 5 diodes.
From the project
(Yet another) house bus hardware based on STM32F072 and the CAN bus
This repository holds hardware and software design for a work in progress house bus system. It operates using a 4-wire bus using the CAN bus as well as supply of ~10 - 20 V. It should provide a base for very simple nodes (e.g. sensors, digital actors) as well as more complex nodes (e.g. a heating system controller).
The system design started in November 2017 when the need of a better heating system controller arose in a housing project in Wurzen, Germany. The gas heating system, a well overpowered Viessmann Atola controlled by a Viessmann Trimatik MC should be better controlled in light load…
Main components on the Base heating
Base heating bill of materials (BOM)
86 components, 43 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MAX3078E | SOIC-8_3.9x4.9mm_Pitch1.27mm | U1 |
| 1 | SN65HVD230 | SOIC-8_3.9x4.9mm_Pitch1.27mm | U2 |
| 1 | AT24CS64-SSHM | SOIC-8_3.9x4.9mm_Pitch1.27mm | U3 |
| 1 | STM32F072C8Tx | LQFP-48_7x7mm_Pitch0.5mm | U4 |
| 2 | MOC3061M | DIP-6_W7.62mm | U5, U6 |
| 1 | NTR2101P | SOT-23 | Q1 |
| 4 | IRF540N | SOT-223-3_TabPin2 | Q2, Q3, Q4, Q5 |
| 2 | BT136 | TO-220_Neutral123_Vertical | Q6, Q7 |
| 1 | X1_1-20 | Pin_Header_Straight_1x20_Pitch2.00mm | J1 |
| 1 | X1_21-40 | Pin_Header_Straight_1x20_Pitch2.00mm | J2 |
| 1 | STEPDOWN | Pin_Header_Straight_1x04 | J3 |
| 1 | BOOT | Pin_Header_Straight_1x03 | J4 |
| 1 | GND | TerminalBlock_Pheonix_MPT-2.54mm_4pol | J5 |
| 1 | DIN_1 | TerminalBlock_Pheonix_MPT-2.54mm_4pol | J6 |
| 1 | SWD | Pin_Header_Straight_1x03 | J7 |
| 2 | I2C | Pin_Header_Straight_1x04 | J8, J10 |
| 1 | A_D_IN | Pin_Header_Straight_1x04 | J9 |
| 1 | USB | Pin_Header_Straight_1x03 | J11 |
| 2 | POWER_BUS | TerminalBlock_Pheonix_MPT-2.54mm_4pol | J12, J13 |
| 1 | DCSW_2 | TerminalBlock_Pheonix_MPT-2.54mm_4pol | J14 |
Show 23 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | DCSW_1 | TerminalBlock_Pheonix_MPT-2.54mm_4pol | J15 |
| 1 | ACSW_1 | TerminalBlock_Pheonix_MPT-2.54mm_4pol | J16 |
| 1 | RS422 | TerminalBlock_Pheonix_MPT-2.54mm_4pol | J17 |
| 1 | UART_1 | Pin_Header_Straight_1x03 | J18 |
| 3 | Jumper_NO_Small | C_0201_NoSilk | JP1, JP2, JP3 |
| 2 | LED | LED-3MM | D1, D2 |
| 1 | D_TVS_x2_AAC | SOT-23 | D3 |
| 2 | D_Zener | Diode_DO-41_SOD81_Vertical_AnodeUp | D4, D5 |
| 1 | 10µ | C_1206 | C1 |
| 12 | 100n | C_0805_HandSoldering | C2, C3, C4, C5, C6, C7, C8, C9 +4 |
| 1 | 1µ | C_0805_HandSoldering | C14 |
| 1 | 10n | C_0805_HandSoldering | C15 |
| 2 | 10n | C_Rect_L7.0mm_W6.5mm_P5.00mm | C16, C17 |
| 6 | 500 | R_0805_HandSoldering | R1, R3, R6, R8, R9, R11 |
| 1 | 0 | R_0805_HandSoldering | R2 |
| 2 | 120 | R_0805_HandSoldering | R4, R5 |
| 7 | 10k | R_0805_HandSoldering | R7, R12, R13, R14, R15, R16, R19 |
| 1 | 2 | R_0805_HandSoldering | R10 |
| 2 | 2k2 | R_0805_HandSoldering | R17, R18 |
| 4 | 360 | R_0805_HandSoldering | R20, R24, R25, R28 |
| 1 | 47k | R_0805_HandSoldering | R21 |
| 2 | 100 | R_0805_HandSoldering | R22, R23 |
| 4 | 38 | R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical | R26, R27, R29, R30 |
Base heating design files
The KiCad project lives in the NerdyProjects/HouseBusNode repository on GitHub; these links point at the commit this page was built from.
Base heating: common questions
What microcontroller does the Base heating use?
The Base heating is built around the STM32F072C8Tx, from the STM32 family.
How big is the Base heating PCB?
The Base heating measures 65 × 65.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Base heating?
86 components, from 43 distinct parts. The full bill of materials is listed on this page.
Where can I download the Base heating design files?
From the NerdyProjects/HouseBusNode repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Base heating design in my own project?
The repository has no license, so all rights stay with NerdyProjects. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Base heating 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.
More boards in HouseBusNode
Similar boards
STM32LumenPnP Motherboard
opulo-inc
149 × 95 mm296 parts4LCC-BY-SA-4.03.7k
STM32AxxSolder
AxxAxx
39 × 82.5 mm122 parts2LGPL-3.01.7k
STM32AIOC
skuep
21 × 31.5 mm47 parts2LMIT1.4k
STM32Ferris
pierrechevalier83
208.8 × 86.8 mm102 parts2LSHL-2.11.3k
STM32176 pin board
rusefi
61.8 × 73.2 mm76 parts2LGPL-3.01.2k
STM32Brain board STM32F407
61.8 × 73.2 mm69 parts2LGPL-3.01.2k