Twomes opentherm monitor hardware
About the Twomes opentherm monitor hardware PCB
Twomes opentherm monitor hardware is an open source PCB design by energietransitie, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 31.1 × 34.5 mm, with 28 components from 18 distinct parts.
Other key parts include the HT7550-1, LM393DR2G and C29981. By type, the board carries 10 resistors, 7 diodes, 4 ICs, 4 connectors, 2 capacitors and 1 switch.
From the project
Open hardware design files for the Twomes OpenTherm Monitor device
This repository contains the open hardware design files for the Twomes OpenTherm Monitor device, consisting of: a Twomes OpenTherm Monitor Shield with a WeMos D1 Mini shield form factor, to be placed on; a WeMos D1 Mini board, such as the LilyGO TTGO T7 Mini32 V1.3 ESP32.
The OpenTherm Monitor Shield is connected via one pluggable terminal block with screws to connect one wire pair leading to a boiler that supports OpenTherm and via another one pluggable terminal block with screws to connect another wire pair leading to a thermostat that supports OpenTherm. The Twomes OpenTherm Monitor can…
Main components on the Twomes opentherm monitor hardware
Twomes opentherm monitor hardware bill of materials (BOM)
28 components, 18 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | HT7550-1 | SOT-89-3 | U1 |
| 1 | LM393DR2G | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 2 | C29981 EL357N(C) | SO-4_4.4x3.6mm_P2.54mm | U3, U4 |
| 1 | Boiler | TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J1 |
| 1 | Therm | TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J2 |
| 2 | CONN_01X08 | D1_mini_Pin_Header | P1, P2 |
| 1 | SW_Push | SW_SPST_EVQP7C | SW1 |
| 5 | B5819W | D_SOD-123 | D1, D2, D3, D4, D5 |
| 1 | C2293 Blue Therm (Voltage) | LED_0805_2012Metric | D6 |
| 1 | C84256 Red Boiler (Current) | LED_0805_2012Metric | D7 |
| 1 | 10NF 10nF | C_0603_1608Metric | C1 |
| 1 | 10UF 10uF | C_0603_1608Metric | C2 |
| 1 | 4.7R | R_0603_1608Metric | R1 |
| 1 | 33K 33k | R_0603_1608Metric | R2 |
| 3 | 10K 10k | R_0603_1608Metric | R3, R9, R10 |
| 1 | 470R | R_0603_1608Metric | R4 |
| 2 | 18K 18k | R_0603_1608Metric | R5, R6 |
| 2 | 1k | R_0603_1608Metric | R7, R8 |
Twomes opentherm monitor hardware design files
The KiCad project lives in the energietransitie/twomes-opentherm-monitor-hardware repository on GitHub; these links point at the commit this page was built from.
Twomes opentherm monitor hardware: common questions
How big is the Twomes opentherm monitor hardware PCB?
The Twomes opentherm monitor hardware measures 31.1 × 34.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Twomes opentherm monitor hardware?
28 components, from 18 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 opentherm monitor hardware design files?
From the energietransitie/twomes-opentherm-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 opentherm 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.