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 ...