HardLabs

OpenTRV-ESP

mpiraux·OpenTRV-ESP·pcb/OpenTRV-ESP.kicad_pcb

OpenTRV-ESP PCB layout, top view — open source ESP32 board by mpiraux

About the OpenTRV-ESP PCB

OpenTRV-ESP is an open source ESP32 PCB design by mpiraux, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 45 × 53 mm, with 58 components from 29 distinct parts.

Its main chip is the ESP32-C6-MINI-1/U, from the ESP32 family. Other key parts include the SHT40, HT7833, TLV61048, SN74LVC2G14DBV and TB6612FNG. By type, the board carries 19 resistors, 17 capacitors, 7 ICs, 5 connectors, 4 diodes and 3 transistors.

It belongs with the robotics & motion designs in this gallery.

From the project

An open-source and open-hardware thermostatic radiator valve based on the ESP32C6 and the 28BYJ-48 stepper motor.

An open-source and open-hardware thermostatic radiator valve based on the ESP32C6 and the 28BYJ-48 stepper motor.

The design phase is ongoing and documented.

All the software source code is available under the MIT license while the hardware design files and derivatives are available under the CERN Open Hardware Licence Version 2 - Permissive.

Inspired by https://github.com/fabianmuehlberger/OpenValve.

OpenTRV-ESP, from the project README
From the project README

Main components on the OpenTRV-ESP

SHT40HT7833ESP32-C6-MINI-1/UTLV61048SN74LVC2G14DBVTB6612FNGINA219AxDCN

OpenTRV-ESP bill of materials (BOM)

58 components, 29 distinct parts.

QtyPartRefs
1
SHT40
U1
1
HT7833
U2
1
ESP32-C6-MINI-1/U
U3
1
TLV61048
U4
1
SN74LVC2G14DBV
U5
1
TB6612FNG
U6
1
INA219AxDCN
U7
1
FDN340P
Q1
2
BSS123
Q2, Q3
1
I2C
J2
1
Buttons
J3
1
Screen
J4
1
Stepper Motor
J5
1
USB_C_Plug_USB2.0
P1
1
EN Push
SW1
1
Boot
SW2
3
1N5819WS
D1, D3, D4
1
LED
D2
1
2.2uH
L1
8
100n
C1, C4, C7, C10, C12, C16, C17, C18
Show 9 more
QtyPartRefs
3
1µ
C2, C3, C8
4
10µ
C5, C9, C11, C15
1
330uF 6.3V
C6
1
10uF 25V X5R
C13
4
1M
R1, R2, R4, R12
9
10k
R3, R5, R6, R7, R8, R9, R10, R11 +1
3
180k
R13, R14, R15
2
100R
R17, R19
1
20m
R18

OpenTRV-ESP design files

The KiCad project lives in the mpiraux/OpenTRV-ESP repository on GitHub; these links point at the commit this page was built from.

OpenTRV-ESP: common questions

What microcontroller does the OpenTRV-ESP use?

The OpenTRV-ESP is built around the ESP32-C6-MINI-1/U, from the ESP32 family.

How big is the OpenTRV-ESP PCB?

The OpenTRV-ESP measures 45 × 53 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the OpenTRV-ESP?

58 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the OpenTRV-ESP design files?

From the mpiraux/OpenTRV-ESP repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the OpenTRV-ESP design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which mpiraux chose for the repository.

Can I test firmware for the OpenTRV-ESP 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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