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Twomes temp monitor hardware

energietransitie·twomes-temp-monitor-hardware·pcb/TwomesSensor.kicad_pcb

Twomes temp monitor hardware PCB layout, top view — open source ESP32 board by energietransitie

About the Twomes temp monitor hardware PCB

Twomes temp monitor hardware is an open source ESP32 PCB design by energietransitie, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 73 × 77 mm, with 40 components from 22 distinct parts.

Its main chip is the ESP32-WROOM-32E, from the ESP32 family. Other key parts include the SI7051-A20, DS18B20Z and WEMOS_D1_MINI_BREAKOUT. By type, the board carries 10 capacitors, 8 resistors, 5 ICs, 5 connectors, 3 switches and 2 transistors.

It belongs with the sensors, iot & wireless and dev boards & breakouts designs in this gallery.

From the project

Open hardware design files for the Twomes Temperature Monitor hardware

This repository contains the open hardware design files for the battery powered Twomes Temperature Monitor hardware, which can read measurement data from a varity of sensors: two DS18b20(Z) temperature sensors in clamps that can be connected the supply water pipe (from the boiler to the hydronic radiators) and return water pipe (from the hydronic radiators to the boiler); an Si7051 sensor mounted on the main PCB itself to measure room temperature; a Twomes CO₂ Monitor Shield with the WeMos D1 Mini shield form factor that measures temperature via an Si7051 sensor and a Sensirion SCD41 sensor…

Twomes temp monitor hardware, from the project README
From the project README

Main components on the Twomes temp monitor hardware

ESP32-WROOM-32ESI7051-A20DS18B20ZWEMOS_D1_MINI_BREAKOUT

Twomes temp monitor hardware bill of materials (BOM)

40 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-WROOM-32E
ESP32-WROOM-32D
U1
1
SI7051-A20
Si7051-A20
U2
2
DS18B20Z
U3, U4
1
WEMOS_D1_MINI_BREAKOUT
WeMos_D1_mini_breakout
U5
2
C75560
PMV48XP,215
Q1, Q2
1
Female header
J1
4
Molex PicoFlex 90814
J2, J3, J4, J5
2
LS14500
BT1, BT2
2
Conn_01x04_Female
CO2-Bare, CO2-Breakout
1
SolderJumper
JP1
3
SW_Push
SW1, SW2, SW3
1
C84256
RED_LED
D1
1
C2297
GREEN_LED
D2
3
1UF
1uF
C1, C6, C7
1
0.47F
C2
4
100NF
100nF
C3, C5, C8, C9
1
470UF
470uF
C4
1
10UF
10uF
C10
1
100R
R1
4
10K
R2, R6, R7, R10
Show 2 more
QtyPartRefs
2
1K
R3, R4
1
4K7
4k7
R8

Twomes temp monitor hardware design files

The KiCad project lives in the energietransitie/twomes-temp-monitor-hardware repository on GitHub; these links point at the commit this page was built from.

Twomes temp monitor hardware: common questions

What microcontroller does the Twomes temp monitor hardware use?

The Twomes temp monitor hardware is built around the ESP32-WROOM-32E, from the ESP32 family.

How big is the Twomes temp monitor hardware PCB?

The Twomes temp monitor hardware measures 73 × 77 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Twomes temp monitor hardware?

40 components, from 22 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Twomes temp monitor hardware design files?

From the energietransitie/twomes-temp-monitor-hardware repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Twomes temp monitor hardware design in my own project?

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

Can I test firmware for the Twomes temp monitor hardware 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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