Arduino analog code#

What happens at the values in between 0 and 5 volts? The analog input value is a number between, so at 2 volts we get a value of 409. On the ruler above, we can see that at 0 volts we get a reading of 0, and at 5 volts we get a reading of 1023. Let’s take a look at the drawing below of a new ruler: on the top we see voltage ranging from 0 to 5 volts: on the bottom we see the range we might get from an analog input pin on the Arduino, 0 – 1023.Īnalog input pins read voltage levels from 0V to 5V and convert them to a range of values from 0 to 1023 This process is called analog to digital conversion. The Arduino converts voltages values between 0V and 5V into a number between. The values that we get using the analog pins are a scaled measurement of voltage. Remember Ohm’s Law? Here we see it in action, with a changing amount of resistance affecting the amount of voltage. If the potentiometer is turned all the way to the other side, with no resistance, we would read a voltage of 5 volts. If we were to use a multimeter to read the voltage out of pin A0 when the potentiometer is all the way to one side, giving maximum resistance, we would read a voltage of 0. How is the changing resistance of the potentiometer affecting the values coming out of pin A0?

Arduino analog code#

The first line of code has the Arduino check the value of voltage coming in from the potentiometer on pin A0. Analog input: values from the potentiometer