As I wrote in the first part of my article, how to design a cheap plant watering sensor, I had troubles to get exact measurements of the current, using my Testo multimeter. I searched for a solution and found the µCurrent Gold device, from David L. Jones known for the EEVblog. Later a little bit more about the device, first the measurements.
I could do the measurements using the oscilloscope and not only measure the static current consumption, but the current consumption over time. The graph shown in the diagram, is the reading of if the sensor does one single measurement and flashes the LED. Continue reading Plant Watering Sensor – Precise Current Measurement