Clayton wrote a simple Python script to plot the usage data extracted by rtlamr, and after a week determined that water was being consumed at 10 liters an hour even while away from home. Suspecting a leak in the toilets he turned off their valves and the next day saw that the reading remained constant when away, indicating that he'd found the leak.
Smart meters are meters that monitor electricity usage and wirelessly transmit consumption data to the electricity company. They are a part of the “smart grid”, and allow for better electricity control and usage reporting.
Douglas recently wrote in to us to let us know about his work on RTLAMR, an RTL-SDR based Automatic Meter Reader (AMR) decoder. Currently Douglas has tested the decoder on his local Itron C1SR smart meters, but notes that it should work on any meter using the common AMR protocol known as Electronic Receiver Transmitter (ERT).