The integrated circuit used in this application is uncommon today. The circuit is from American documentation from the 1980s. It can be changed to use more modern equivalent components.
By LED flashes you can get an idea of the degree of moisture in the soil. The sensors are wires...
This capacitive switch or approximation relay was found in a 1980s US publication. Power should...
Found in an Electronic Design of 1964, this circuit operates with control voltages from 0 to 12 V...