Thermostat Cable Splitter
About the Thermostat Cable Splitter PCB
Thermostat Cable Splitter 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 70 × 30 mm, with 38 components from 22 distinct parts.
Other key parts include the SE8650X2-HF, LMV393TP-SR and C2836429. By type, the board carries 15 resistors, 13 diodes, 4 ICs, 3 connectors, 2 capacitors and 1 transistor.
It belongs with the sensors designs in this gallery.
From the project
Open hardware design files for the NeedForHeat Boiler Monitor devices
This repository contains the open hardware design files for the NeedForHeat Boiler Monitor hardware, which consists of PCB and 3D printable pipeclamps for:
Boiler-BASE module for the on the back of an M5Stack CoreInk device; Thermostat Cable Splitter module, which is inserted by the subject in the signal path between boiler and thermostat; * Two pipe clamps with temperature sensors that can be clipped on the supply and return pipes that carry hot water from the boiler to the radiators and returning from the radiators.
Main components on the Thermostat Cable Splitter
Thermostat Cable Splitter bill of materials (BOM)
38 components, 22 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SE8650X2-HF | SOT-23 | U1 |
| 1 | LMV393TP-SR | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 2 | C2836429 CYTLP127(TP) | SO-4_4.4x3.6mm_P2.54mm | U3, U4 |
| 1 | C2149 Transistor | SOT-23 | Q1 |
| 1 | C8446 Boiler | PhoenixContact_MSTBA_2,5_4-G-5,08_1x04_P5.08mm_Horizontal | J1 |
| 1 | C8446 Therm | PhoenixContact_MSTBA_2,5_4-G-5,08_1x04_P5.08mm_Horizontal | J2 |
| 1 | RJ45 | RJ45_Amphenol_54602-x08_Horizontal | J3 |
| 9 | C8598 B5819W SL | D_SOD-123 | D1, D2, D3, D4, D5, D10, D11, D12 +1 |
| 1 | C2986058 Blue Therm (Voltage) | LED_0603_1608Metric | D6 |
| 1 | C72038 Yellow Boiler (Current) | LED_0603_1608Metric | D7 |
| 2 | 1N4148WS | D_SOD-323_HandSoldering | D8, D9 |
| 1 | 100NF 100nF | C_0805_2012Metric | C1 |
| 1 | 10UF 10uF | C_0805_2012Metric | C2 |
| 1 | 4.7 | R_0603_1608Metric | R1 |
| 1 | 220K 220k | R_0603_1608Metric | R2 |
| 4 | 68K 68k | R_0603_1608Metric | R3, R5, R6, R12 |
| 1 | 1.8K | R_0603_1608Metric | R4 |
| 1 | 2.2K 2.2k | R_0603_1608Metric | R7 |
| 1 | 4.7K 4.7k | R_0603_1608Metric | R8 |
| 2 | 1k | R_0603_1608Metric | R9, R10 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 270 | R_0603_1608Metric | R11 |
| 3 | TBD | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13, R14, R15 |
Thermostat Cable Splitter design files
The KiCad project lives in the energietransitie/needforheat-boiler-monitor-hardware repository on GitHub; these links point at the commit this page was built from.
Thermostat Cable Splitter: common questions
How big is the Thermostat Cable Splitter PCB?
The Thermostat Cable Splitter measures 70 × 30 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Thermostat Cable Splitter?
38 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 Thermostat Cable Splitter design files?
From the energietransitie/needforheat-boiler-monitor-hardware repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Thermostat Cable Splitter design in my own project?
Yes, under the terms of its CERN-OHL-P-2.0 license, which energietransitie chose for the repository.
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