MCP47A1 - Setting specific voltages

We can set the DAC to output a specific voltage at any time.

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Connections for each example

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First, we have to include the library and create an instance of the DAC object:

#include "MCP47A1-SOLDERED.h" // Include Soldered library for MCP47A1 DAC.
MCP47A1_SOLDERED dac; // Create an instance of the object

Next, in the setup() function, we initialize the I2C communication with the DAC:

void setup()
{
    dac.begin();          // Initialize the DAC library.
}

dac.begin()

Initializes the I/O DAC via I2C

Returns value: None

Finally, in the loop() function, we can hook up an LED to the VOUT and GND connectors and change the voltage every 2 seconds:

void loop()
{
    float volts;

    // Set DAC output voltage to 0 V
    volts = 0;
    dac.setVoltage(volts);
    delay(2000);

    // Set DAC output voltage to 1 V
    volts = 1;
    dac.setVoltage(volts);
    delay(2000);

    // Set DAC output voltage to 2.5 V
    volts = 2.5;
    dac.setVoltage(volts);
    delay(2000);

    // Set DAC output voltage to 3.3 V
    volts = 3.3;
    dac.setVoltage(volts);
    delay(2000);
}

dac.setVoltage(float _volts)

Sets the voltage at the DAC's output.

Returns value: None

Function parameters:

Type	Name	Description
float	_volts	Voltage at the DAC's output in the range from 0V to VCC.

Full example

See the full example below:

#include "MCP47A1-SOLDERED.h" // Include Soldered library for MCP47A1 DAC.

MCP47A1_SOLDERED dac; // Create an instance of the object

void setup()
{
    dac.begin();          // Initialize the DAC library.
}

void loop()
{
    float volts;

    // Set DAC output voltage to 0 V
    volts = 0;
    dac.setVoltage(volts);
    delay(2000);

    // Set DAC output voltage to 1 V
    volts = 1;
    dac.setVoltage(volts);
    delay(2000);

    // Set DAC output voltage to 2.5 V
    volts = 2.5;
    dac.setVoltage(volts);
    delay(2000);

    // Set DAC output voltage to 3.3 V
    volts = 3.3;
    dac.setVoltage(volts);
    delay(2000);
}