Inputs

Inputs (A0 … Ax)

NEXTuino has many analog inputs that can be used as analog and digital inputs. This will be set in the user program.

Inputs as Analog Input

The data logging works with the internal A/D converter of the microcontroller and has a resolution of 10Bit and delivers the values 0–1023. NEXTuino internally uses an automatic voltage divider controlled over the supply voltage. Dependent on the supply voltage the divider is switched to the right value.

If you use a 12V supply voltage the measured value can be between 0–13.2V.

  • 1 digit = 0.015V (15.0mV)

If you use a 24V supply voltage the measured value can be between 0–26.4V.

  • 1 digit = 0.03V (30.0mV)

The scaling factor is:

  • @12V: 3.06
  • @24V: 6.14

INFO: All inputs are protected against electrostatic discharging and overvoltage.

Inputs as Digital Input

Every A0…Ax input can also be used as a digital input to measure a switching status. If a logic “1” is measured the corresponding LED Ax will be active. At a logic “0” the corresponding LED Ax will be off. This optical information can be used to get a quick overview about the status of the inputs.

Logic levels depending on supply voltage:

LogicSupply VoltageLevel
012V0 .. 3.6V
112V9 .. 13.2V
024V0 .. 7.2V
124V18 .. 26.4V

The maximum input current is < 3mA.

Digital Inputs (I..)

These inputs are only digital inputs. If a logic “1” is measured the corresponding LED Ax will be active. At a logic “0” the corresponding LED Ax will be off.

Logic levels depending on supply voltage:

LogicSupply VoltageLevel
012V0 .. 3.6V
112V9 .. 13.2V
024V0 .. 7.2V
124V18 .. 26.4V

The maximum input current is < 3mA.

Interrupt Inputs (IN0 and IN1)

Additional to the normal analog and digital inputs, NEXTuino also has 2 special interrupt inputs. These inputs are capable of measuring very fast and important switching operations. The electrical behavior is like a normal digital input, but in the user program they can execute subroutines at the change of input level.

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