数据手册：https://item.szlcsc.com/62476.html

c
#include <Wire.h> /* Include the Wire library to  I2C */
/* This is the I2C Address of the MCP4725, by default (A0 pulled to GND). */
#define MCP4725_ADDR 0x60
/* For devices with A0 pulled HIGH, use 0x61 */
unsigned int adcvalue = 1000;//0~4095 代表了0到5V
void setup()
{
  Wire.begin();
  Wire.beginTransmission( MCP4725_ADDR );
  Wire.write( 64 );                       /* cmd to update the DAC */
  Wire.write( adcvalue >> 4 );            /* the 8 most significant bits... */
  Wire.write( (adcvalue & 0x000f) << 4 ); /* the 4 least significant bits... */
  Wire.endTransmission();
}
void loop()
{
}