Tag Archives: sam

Plant Watering Sensor – Long Term Logging

To gather more long-term measurements for the capacitive method I use for my plant watering sensor, I created this small logging device. As you can see, it uses one of the plant watering sensor prototypes for the measurements. Instead of using the ATtiny13A on the board, it passes the oscillator signal directly to the microprocessor of the logging device.

In front there is a very small 128×32 OLED display, where I can see the current measured frequency in kHz. On top, the current time and date is visible, and on the right there is a graph where I can see the values from the last 48 hours graphically. There is not much visible in the graph, because I took the photo just after installing the sensor.

Every minute, the current average of measurements is stored in a CSV file on a SD card. After a few weeks I should be able to analyse this file and see the results. Here I am especially interested in the cycles from watering the plant until the soil got dry again. Continue reading Plant Watering Sensor – Long Term Logging