Agile Practice, Recipes, Photography and Maker Magazine
While working on JMPM, I ran into the exact same problem described by everyone else who has built a current sensor around the SCT013. JMPM is based on the references at OpenEnergyMonitor and they have a great article on the performance of measuring low currents. When I designed my circuit for Jm Power Meter (JMPM), I took their word at…
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The first batch of JMPM Hardware Rev001 was delivered last week. After some initial testing, the board was found to be rather functional. One signal for each CT sensor was misrouted, but this is easily fixed with a jumper wire. Having the prototype also allowed proper characterization of the circuit and can be improved on by the inclusion of an…
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The JM Power Meter (JMPM) is a high resolution non-invasive energy monitoring device with support for sensing the current on up to 5 circuits and voltage. Based on the designs by OpenEnergyMonitor, this offers 12 bit analog to digital converters as well as a user selectable measurement range of either 120A or 35A per channel with better than 1 watt…
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The database for my hot tub was returning IO errors and when I tried to use the VACUUM command, it returned an error: Result: database disk image is malformed Let’s fix this!
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