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This is a low-cost solution for tracking home gas consumption in Home Assistant . Ideal for those who want to drill down into their consumption of gas but their utility provider does not offer smart metering.  The solution works with those residential diaphragm gas meters that come 'smart ready'. The gas utility company providing service in my home installed the model Itron-Flogiston G4 RF1 which is a typical example of these devices. According to the specification the device is equipped with a totalizer that includes a " pulse generator (option)... with a permanent magnet in counter roller. Can be refitted with a pulse transmitter (Reed switch). "   The optional  Reed switch based pulse transmitter is available both from the manufacturer of the gas meter and also from  others  for a fairly high price. I decided to go on a low cost route. Illustration: Wikipedia While I am aware of Reed-swich based DIY solutions to this problem, I finally ended up ...