/* 
 * Lesson 109-2: Control the output voltage of MCP4725 from Serial Monitor
 * Enter a value in mV; for example, to output 1.85V, enter 1850. 
 * To set the output to 0V, enter 0.
 * 
 * Watch video instructions for this code: https://youtu.be/j_BwZT9z-0g
  
Projects in this video: https://youtu.be/j_BwZT9z-0g
Project 1: Output 0 to 5V or 0 to 3V depending on which kind of power source you use for the module. The output is shown on a digital multimeter. 
Project 2 (this project): Serial command to set voltage
Project 3: PWM duty cycle to voltage converter
Project 4: Using two MCP4725 DAC modules
Project 5: Using a push button to set voltage on LCD

 * Written by Ahmad Shamshiri using Adafruit library for MCP4725
 Sep 26, 2022
 www.Robojax.com
 
  
   * 
   * This code is part of the Arduino Step by Step Course, which starts here:  https://youtu.be/-6qSrDUA5a8
   * 
   * For the library for this code, visit http://robojax.com/
   * 
  If you found this tutorial helpful, please support me so I can continue creating 
  content like this. Make a donation using PayPal or a credit card: https://bit.ly/donate-robojax 
  
 
  
   *  * 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 downloaded from Robojax.com
      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
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      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 <https://www.gnu.org/licenses/>.
 

    Based on the Adafruit MCP4725 Library
    ----> http://www.adafruit.com/products/935

    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;//your Arduino voltage will work with 2.7V to 5.5V.


Adafruit_MCP4725 dac;
int mV, mV_entered;
float V;
boolean updateVoltage = false;

void setup(void) {
  Serial.begin(9600);
  Serial.println("MCP4725 by Robojax");
  //run i2C scanner to find out the I2C address and enter it below
  //see video for details https://youtu.be/j_BwZT9z-0g
  //get more code from www.Robojax.com   
  dac.begin(0x60);

  Serial.println("Generate Voltage from Serial Command");
}

void loop(void) {
      while (Serial.available() > 0)
      {
        mV_entered = Serial.parseInt();//read user's input as integer
        Serial.print("Entered: ");
        Serial.print(mV_entered );
        Serial.println("mV");
        updateVoltage = true;//set to updat the voltage
      } 
      
      if(mV_entered >0 && mV_entered < refV && updateVoltage)
      {
    setmV(mV_entered);//set the voltage
    Serial.print(mV);
    Serial.println("mV");
    delay(2000);
      }else{
        if(mV_entered == 0)
        {
          setmV(0);
          updateVoltage = false;
        }
      }

delay(200);
  //see video for details https://youtu.be/j_BwZT9z-0g
  //get more code from www.Robojax.com 
    
}

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

}


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

}