void loop(void) {

Serial.print("DFRobot_MCP4725 write to EEPROM and output: ");

Serial.print(OUTPUT_VOLTAGE);

Serial.println(" mV");

DAC.outputVoltageEEPROM(OUTPUT_VOLTAGE);

delay(200);

}

Results



A 1V voltage signal can be measured at VOUT. Disconnect the module from the Arduino. Repower

the module, by connecting oinly the VCC and GND pins of the module to 5V and GND on the

Arduino, respectively. The user can still read 1V at VOUT. The

function DAC.outputVoltageEEPROM () stores the DAC value in the EEPROM while it outputs a

specified analog voltage signal. The module recalls the DAC value in the EEPROM upon power-up

and restores the analog output at VOUT.

Output a Sine Wave



Set the I2C address to 0x60 with the ADDR switch. For I2C address 0x61, you need to modify the

first parameter of the DAC.init () function in the code below.



Open Arduino IDE, upload the following sample code to the Arduino UNO, and use a oscilloscope to

measure the output voltage of VOUT.



The user can modify the parameters in the function DAC.outputSin () to change

the amplitude, frequency and DC offset of the sine wave.

/*

* file OutputVoltage.ino

*

* @ https://github.com/DFRobot/DFRobot_MCP4725

*

* connect MCP4725 I2C interface with your board (please reference board comp

atibility)

*

* Output a constant voltage value and print through the serial port.