Emon-server – 555 Timer as power usage sensor

emon-server RESTful service converting ‘flashing lights’ or ‘pulsing magnets’ on electricity and gas meter to JSON using the trustful 555 timer chip, Python, NodeJS and a Raspberry PI Summary A cheap 555 timer chip acting as Schmitt trigger combined with a phototransistor or LDR is taped to the ‘flashing light’ or ‘pulsing magnet’ on the […]