2 layers48.3 × 66 mm
MC Probe
ECE-4961-Capstone-Team-1-Spring-Fall-22/Autonomous-Crawlspace-Inspection-Robot
Tennessee Tech ECE 4961 Capstone Project Autonomous Crawlspace Inspection Robot
29 parts10MIT
4 layers120 × 50 mm
Uhmc
twuerfl/uhmc1Underfloor Heating Manifold Controller
- Size
- 120 × 50 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 110
- Nets
- 134
- Pads
- 506
- Tracks, vias
- 946, 181
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Mar 2026
- Updated
- 24 Mar 2026
Overview
Uhmc is an open-source printed circuit board by twuerfl, from the twuerfl/uhmc repository on GitHub. It is a 4-layer board of 120 × 50 mm with 110 parts on 134 nets, routed with 946 tracks and 181 vias.
It is built around the ESP32-WROOM-32E-N8, AP63205WU and CP2102C-A01-GQFN24, with the SN74HC595PWRE4, TPL7407LAPW and LAN8720A-CP among its other parts. Its parts include 31 resistors, 29 capacitors, 16 connectors, 11 ICs and 5 diodes. It belongs with the ESP32 boards of this library.
Main components
12
ESP32-WROOM-32E-N8
SMD,25.5x18mm-40℃~+85℃ -98dBm 112mA 2.4GHz 20dBm 239mA 3V~3.6V Bluetooth4.2 ESP32-DOWD-V3 On-board PCB Antenna UART、SDIO、SPI、I2C、GPIO、PWM、I2S SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
AP63205WU
TSOT-23-6-40℃~+85℃@(TA) 1 1.1MHz 22uA 2A 3.8V~32V 5V Buck Built-in Fixed Overcurrent Protection、Light load efficient mode、Cycle-by-cycle current limiting、Hiccup current limiting、EMI optimization (spread spectrum) Step-down type Yes TSOT-23-6 DC-DC Converters ROHSDiodes IncorporatedDC-DC Converters
CP2102C-A01-GQFN24
QFN-24QFN-24 USB Converters ROHSSilicon LabsUSB Converters
SN74HC595PWRE4
TSSOP-16-175mil-40℃~+85℃ 1 14ns@6V,50pF 29MHz 2V~6V 6mA 6mA 6mA 74HC 8 Asynchronous clear function、Output enable Serial-to-Parallel or Serial Tri-State TSSOP-16-175mil Shift Registers ROHSTexas InstrumentsShift RegistersTPL7407LAPW
TSSOP-16-40℃~+125℃ 1.8V~5V 7 Active High Low Side Switch TSSOP-16 Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
LAN8720A-CP
QFN-24-EP(4x4)Ethernet ICsMicrochip TechnologyUSBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
B4B-ZR
插件,P=1.5mmWire To Board ConnectorJST
RC0603FR-07330RL
UncategorisedUnknown makerRC0603FR-0749R9L
UncategorisedUnknown makerTBL009-254-06GY-2GY
插件,P=2.54mmSpring Clamp System Terminal BlockCUI
1N5819HW-7-F-01
SOD-123Schottky DiodesDiodes Incorporated
README
README.mdUHMC – Underfloor Heating Manifold Controller
UHMC (Underfloor Heating Manifold Controller) is a modular, ESP32-based controller designed for precise regulation of underfloor heating circuits. It integrates advanced control features while remaining cost-efficient and flexible for home automation setups.
Features
- Microcontroller: ESP32-WROOM-32E
- Connectivity:
- Ethernet via LAN8720A OR WIFI
- Optional USB via CP2102N (default not populated to reduce cost)
- Heating Circuit Control:
- 12 heating circuits (loops) total
- Circuits 11 and 12 share two outputs for double current capacity
- Driver Hardware:
- 2 × TPL7407LAPW motor drivers
- Each driven via a SN74HC595PWR shift register
- I²C Expansion:
- TCA9548AMRGER I²C multiplexer
- Supports 8 separate I²C inputs
- Firmware: ESPHome
Hardware Overview
| Component | Purpose |
|---|---|
| ESP32-WROOM-32E | Main controller |
| LAN8720A | Ethernet interface |
| CP2102N | Optional USB for programming/debugging |
| TPL7407LAPW | 7-channel motor drivers for valve actuation |
| SN74HC595PWR | Shift registers to extend GPIOs for TPL7407LAPW |
| TCA9548AMRGER | I²C multiplexer for up to 8 I²C inputs |
System Architecture
ESP32
-> SN74HC595 -> TPL7407LAPW -> Heating Circuits 1-12
-> TCA9548AM -> I²C Sensors
-> LAN8720A -> Ethernet
-> CP2102N -> Optional USB
- Heating circuits 11 and 12 are paralleled for higher current capacity.
- ESPHome handles PID control, sensor input, and automation integration.
Features in ESPHome
- Supports up to 12 heating circuits with PWM control
- I²C sensor integration via TCA9548 multiplexer
- Optional integration with Home Assistant
- Ethernet connectivity for remote monitoring and updates
- Modular configuration allowing flexible re-assignment of heating circuits
License
CC BY-NC-SA 4.0 https://creativecommons.org/licenses/by-nc-sa/4.0/
Notes
- USB interface is optional to save cost; populated only if needed.
- Firmware is configured via ESPHome YAML files for easy customization.
Parts
110| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100n 16V | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C11, C14, C15, C18, C20, C21, C22, C26, C28 |
| 12 | 4k7 | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R5, R6, R7, R9, R10, R12, R24, R25, R27 |
| 9 | 22u 10V | Capacitor_SMD:C_0603_1608Metric | C7, C8, C9, C10, C12, C17, C19, C23, C29 |
| 8 | B4B-ZR | uhmc:JST_ZH_B4B-ZR_1x04_P1.50mm_Vertical | J8, J9, J10, J11, J12, J13, J14, J15 |
| 6 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP5, TP6, TP7, TP8, TP9, TP10 |
| 5 | 100R | Resistor_SMD:R_0603_1608Metric | R8, R11, R26, R28, R30 |
| 4 | 330 | Resistor_SMD:R_0603_1608Metric | R16, R17, R39, R40 |
| 4 | 49R9 | Resistor_SMD:R_0603_1608Metric | R31, R34, R36, R37 |
| 4 | M3 | MountingHole:MountingHole_3.2mm_M3_ISO7380_Pad | H1, H2, H3, H4 |
| 4 | TBL009-254-06GY-2GY | uhmc:CUI_TBL009-254-06BE-2BE | J1, J2, J3, J4 |
| 3 | 100n 100V | Capacitor_SMD:C_0603_1608Metric | C1, C5, C6 |
| 2 | 12K1 | Resistor_SMD:R_0603_1608Metric | R15, R32 |
| 2 | 1N5819HW-7-F | Diode_SMD:D_SOD-123 | D2, D5 |
| 2 | 1u 10 V | Capacitor_SMD:C_0603_1608Metric | C25, C31 |
| 2 | 5k1 | Resistor_SMD:R_0603_1608Metric | R13, R14 |
| 2 | SN74HC595PWR | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U2, U5 |
| 2 | TPL7407LAPW | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U4, U11 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 10u 50V | Capacitor_SMD:C_1206_3216Metric | C30 |
| 1 | 1A | uhmc:Fuseholder_Clip-5x20mm_Bel_FC-203-22_Lateral_P17.80x5.00mm_D1.17mm_Horizontal | F1 |
| 1 | 22n | Capacitor_SMD:C_0603_1608Metric | C16 |
| 1 | 30R | Inductor_SMD:L_0603_1608Metric | FB2 |
| 1 | 33 | Resistor_SMD:R_0603_1608Metric | R29 |
| 1 | 470p | Capacitor_SMD:C_0603_1608Metric | C27 |
| 1 | 4u7 | Inductor_SMD:L_Bourns-SRN4018 | L1 |
| 1 | AP63205WU | Package_TO_SOT_SMD:TSOT-23-6 | U6 |
| 1 | CP2102N-Axx-xQFN24 | Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U13 |
| 1 | Conn_01x06 | Connector_PinHeader_1.27mm:PinHeader_1x06_P1.27mm_Vertical | J5 |
| 1 | ESP32-WROOM-32E | uhmc:ESP32-WROOM-32E | U9 |
| 1 | GREEN | LED_SMD:LED_0603_1608Metric | D4 |
| 1 | Jack-DC | uhmc:Tensility 54-00164_SMT_Horizontal | J22 |
| 1 | LAN8720A | Package_DFN_QFN:VQFN-24-1EP_4x4mm_P0.5mm_EP2.5x2.5mm | U12 |
| 1 | RED | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | RJMG1BD3B8K1ANR | uhmc:RJ45_Amphenol_RJMG1BD3B8K1ANR | J6 |
| 1 | SMBJ26A | Diode_SMD:D_SMB | D1 |
| 1 | TCA9548AMRGER | Package_DFN_QFN:Texas_RGE0024C_VQFN-24-1EP_4x4mm_P0.5mm_EP2.1x2.1mm | U3 |
| 1 | TLV761-3.3-DCY | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U8 |
| 1 | UMH3N | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q2 |
| 1 | USB4110-GF-A | uhmc:USB_C_Receptacle_GCT_USB4110 | J7 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U10 |
The 106 most common of 110 parts.
Questions
How big is the Uhmc PCB?
It measures 120 × 50 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Uhmc use?
110 parts, built around the ESP32-WROOM-32E-N8, AP63205WU, CP2102C-A01-GQFN24 and SN74HC595PWRE4. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Uhmc KiCad files?
From the twuerfl/uhmc repository on GitHub, at the commit this page was made from: the board is uhmc.kicad_pcb and its schematic uhmc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Uhmc design in my own project?
Its repository states no licence, so its author keeps all rights: ask twuerfl before reusing the design.
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