Hcv
About the Hcv PCB
Hcv is an open source ESP32 PCB design by chrkir, published on GitHub. It is a 2-layer board measuring 49.5 × 40.5 mm, with 31 components from 23 distinct parts.
Its main chip is the ESP32-WROOM-32U, from the ESP32 family. Other key parts include the TPS562242, ATA6560, ADuM1201AR and TEA1-0505. By type, the board carries 14 capacitors, 6 resistors, 5 ICs, 2 connectors, 2 diodes and 1 switch.
It belongs with the iot & wireless designs in this gallery.
From the project
Local Viessmann E3 CAN-bus to MQTT bridge for Vitocal heat pumps. Features Home Assistant Auto-Discovery, ESP32 firmware, and Open Hardware.
# Viessmann Vitocal (E3) CAN-Bus to MQTT Bridge with Home Assistant Support
An isolated, passive CAN-bus adapter to fetch local data from Viessmann E3-generation heat pumps (e.g., Vitocal 250-A, 252-A) and stream it via Wi-Fi to MQTT with native Home Assistant Auto-Discovery.
- 100% Local Control: No internet dependency, no official ViCare Cloud API rate limits. - Hardware Protection: Features full galvanic isolation to protect your expensive heat pump from electrical damage. - Passive Sniffing: Read-only operation ensures zero interference with the heating system's warranty. - Plug & Play…
Main components on the Hcv
Hcv bill of materials (BOM)
31 components, 23 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-WROOM-32U | ESP32-WROOM-32 | U1 |
| 1 | TPS562242 | SOT-563 | U2 |
| 1 | ATA6560 | SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | ADuM1201AR | SOIC-8_3.9x4.9mm_P1.27mm | U4 |
| 1 | TEA1-0505 | Converter_DCDC_TRACO_TEA1-xxxx_THT | U5 |
| 1 | USB_C_Receptacle_PowerOnly_6P | USB_C_Receptacle_GCT_USB4125-xx-x-0190_6P_TopMnt_Horizontal | J3 |
| 1 | Conn_01x02 | PhoenixContact_MC_1,5_2-G-3.5_1x02_P3.50mm_Horizontal | J4 |
| 1 | SW_Push | SW_SPST_EVPBF | SW1 |
| 1 | LED | LED_D3.0mm | D1 |
| 1 | PESD1CAN-UX Nexperia USA Inc. | SOT-23-3 | D3 |
| 1 | 2.2uH | L_Bourns-SRN4018 | L1 |
| 3 | 10uF | C_0805_2012Metric | C1, C4, C10 |
| 6 | 100n | C_0603_1608Metric | C2, C3, C9, C11, C13, C15 |
| 1 | 1uF | C_0603_1608Metric | C5 |
| 1 | 33p | C_0603_1608Metric | C6 |
| 2 | 22uF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C7, C8 |
| 1 | 33/16 | CP_EIA-3528-12_Kemet-T | C12 |
| 1 | 4k7 | R_0603_1608Metric | R1 |
| 1 | 10k | R_0603_1608Metric | R3 |
| 1 | 51R | R_0603_1608Metric | R4 |
Show 3 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 94.2k | R_0603_1608Metric | R5 |
| 1 | 30k | R_0603_1608Metric | R6 |
| 1 | 470R | R_0603_1608Metric | R8 |
Hcv design files
The KiCad project lives in the chrkir/hcv repository on GitHub; these links point at the commit this page was built from.
- Layouthardware/HCV.kicad_pcb
- Schematichardware/HCV.kicad_sch
Hcv: common questions
What microcontroller does the Hcv use?
The Hcv is built around the ESP32-WROOM-32U, from the ESP32 family.
How big is the Hcv PCB?
The Hcv measures 49.5 × 40.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Hcv?
31 components, from 23 distinct parts. The full bill of materials is listed on this page.
Where can I download the Hcv design files?
From the chrkir/hcv repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Hcv design in my own project?
The repository has no license, so all rights stay with chrkir. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Hcv without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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