About the article

Opentherm Monitor

Opentherm Monitor
If you say that the term ‘Opentherm’ is unfamiliar to you, then this will not surprise us the least. Opentherm is a protocol, which can control central heating boilers and hot water systems digitally. ‘Open’ indicates that it is not specific to a single brand. Anyone can, in principle, make use of this protocol, provided you are prepared to hand over several thousand pounds for ‘membership’ and are prepared to keep the information secret (talk about ‘open’…). As a consequence we unfortunately do not know a great deal about it, but we do have a few technically interesting pieces of information we would like to share with you.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
R1,R2 = 18kOhm
R3 = 470Ohm
R4 = 4Ohm 7
R5,R8 = 2kOhm 7
R6 = 33kOhm (30kOhm )
R7 = 10kOhm
R9,R10 = 1kOhm
Capacitors:
C1 = 100nF
C2,C3 = 10µF 63V radial
Semiconductors:
D1-D4,D7,D8 = 1N4148
D5,D6 = LED, high-efficiency
IC1 = TLC272 CP
IC2,IC3 = 6N139
IC4 = LP2950 CZ 5.0
Miscellaneous:
K1,K2 = 2-way PCB terminal block, lead pitch 7.5mm
K4 = 9-way sub-D socket (female)
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