D9 pin as PWM output A0 pin as analog input (for current feedback) GND pin just for GND. R - resistor for current measurement (I have 470 Ohm, I think 300-1000 Ohm would be ok, you need to write ...

This is a simple arduino project for a soil moisture sensor that will light up a LED at a certain moisture level. It uses Arduino Duemilanove microcontroller board. Two wires placed in the soil pot ...

In this tutorial i use a voltage divider circuit and Arduino Uno to measure an unkwown resistance. The output of voltage divider is connected to analog port A0, so the input goes from 0 to 1023. With ...

VCC is the power supply pin of the soil moisture sensor that can be connected to 3.3V or 5V of the supply. But do note that the analog output will vary depending on the provided supply voltage. GND is ...