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Lesson 109: Generate DC Voltage using MCP4725 DAC with LCD and PWM to Voltage Converter with Arduino (5 projects)

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Part 14: Voltage and Current

In this lesson we learn how to use MCP4725 12 bits Digital To Analog Converter (DAC). The chip and module is explained, datasheet viewed and then using 5 Projects this MCP4725 practically shown. Full wiring diagram and wring shown and how to use the code and library explained.

In Project 1 in lesson 109 Using MCP4725 12bits DAC with Ardunino


Timing of chapters in the video

00:00 Introduction
1:19 MCP4725 Explained
4:46 Datasheet viewed
7:07 Project 1: Outputting DC Voltage
09:55 Code and library
13:00 Project 1: demonstration
17:34 Triangular wave
18:54 Sine wave
20:18 Project 2: Control voltage from Serial Monitor
22:21 Project 2: Demonstration
24:53 Project 3: Converting PWM to Voltage
27:33 Code Explained
29:25 Wiring explained
30:29 Project 3: Demonstration
33:25 Project 4: Using two MCP4725 modules
36:27 Project 4: Demonstration
37:30 Project 5: Setting output with push buttons on LCD
39:57 Code explained
45:53 Project 5: Demonstration

 * Lesson 109-1: Generates output DC Voltage from 0 to 5.5V or lower. if power supply
 *  is 3.3V, then max voltage is 3.3V.
 * you can use it simply to enter your request as millivolt like 365mV
 * or 2.872V
 * * Watch Video instrution for this code:
Projects in this video:
Project 1 (this project):Output 0 to 5V or 0 to 3V depending on which kind of power sources you use for the module. The output shown on digital multimeter. 
Project 2: Serial command to set voltage
Project 3: PWM duty cycle to Voltage converter
Project 4: Using two MCP4725 DAC modules
Project 5: Using Push button to set voltage on LCD

 * Written by Ahmad Shamshiri using Adafruit library for MCP4725
 Sep 26, 2022
   * This code is part of Arduino Step by Step Course which starts here:
   * for library of this code visit
  If you found this tutorial helpful, please support me so I can continue creating 
  content like this. Make a donation using PayPal by credit card 
   *  * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
   * This code has been download from
      This program is free software: you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation, either version 3 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program.  If not, see <>.

    Based on  the Adafruit MCP4725 Library

    Adafruit invests time and resources providing this open source code,
    please support Adafruit and open-source hardware by purchasing
    products from Adafruit!

#include <Wire.h>
#include <Adafruit_MCP4725.h>
int refV = 4530;//reference voltage. see video for details

Adafruit_MCP4725 dac;
int mV;
float V;

void setup(void) {
  Serial.println("MCP4725 by Robojax");
  //run i2C scanner to find out the I2C address and enter it below
  //see video for details
  //get more code from   

  Serial.println("Output Voltage");

void loop(void) {

//    setmV(465);//set output to 465mV
//    Serial.print(mV);
//    Serial.println("mV");
//    delay(5000);
//    setV(2.635);//set output to 2.6V
//    Serial.print(V, 3);
//    Serial.println("V");
//    delay(5000);
//    Serial.println();

    for(int i=0; i<refV; i +=100)
  //see video for details
  //get more code from 

 * setmV()
 * sets mV value such as 35mV or 2654mV (2.654V)
 * Written Sep 25, 2022
 * by Ahmad Shamshiri
void setmV(int d)
    mV =d;
    dac.setVoltage(map(d, 0, refV, 0, 4095), false);


 * setV()
 * sets Voltage value value in volts such as 3.764
 * Written Sep 25, 2022
 * by Ahmad Shamshiri
void setV(float d)
    V = d;
    dac.setVoltage( map((d *1000), 0, refV, 0, 4095), false);



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