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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 4 in lesson 109 Lesson 109-4: Using Two MCP4725 DAC Module with Arduino
/*
* Lesson 109-4: Using Two MCP4725 DAC Module with Arduino
* each module can have independant different voltage source and
* can set to output independant voltage
*
* * Watch Video instrution 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 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 (this project): 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
www.Robojax.com
*
* This code is part of Arduino Step by Step Course which starts here: https://youtu.be/-6qSrDUA5a8
*
* for library of 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 by 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 download 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 refV1 = 4548;//set reference voltage for module 2 in mV
int refV2 = 3300;//set reference voltage for module 2 in mV
Adafruit_MCP4725 dac1;
Adafruit_MCP4725 dac2;
int mV1, mV2;//defining variable for millivot value for 1st and 2nd module
float V1, V2;//defining variable for volt value for 1st and 2nd module
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
dac1.begin(0x60);//set I2C address for device dac1
dac2.begin(0x61);//set I2C address for device dac2
Serial.println("Dual MCP4725 Devices");
}
void loop(void) {
setmV2(1353);
Serial.print ("DAC1: ");
Serial.print(mV1);
Serial.println("mV");
delay(5000);
setV2(2.624);
Serial.print ("DAC2: ");
Serial.print(V2, 3);
Serial.println("V");
delay(5000);
Serial.println();
//see video for details https://youtu.be/j_BwZT9z-0g
//get more code from www.Robojax.com
}
/*
* setmV1()
* sets mV value such as 35mV or 2654mV (2.654V)
* Written Sep 25, 2022
* by Ahmad Shamshiri www.Robojax.com
*/
void setmV1(int d)
{
mV1 =d;
dac1.setVoltage(map(d, 0, refV1, 0, 4095), false);
}
/*
* setV1()
* sets Voltage value value in volts such as 3.764
* Written Sep 25, 2022
* by Ahmad Shamshiri www.Robojax.com
*/
void setV1(float d)
{
V1= d;
dac1.setVoltage( map((d *1000), 0, refV1, 0, 4095), false);
}
/*
* setmV2()
* sets mV value such as 35mV or 2654mV (2.654V)
* Written Sep 25, 2022
* by Ahmad Shamshiri www.Robojax.com
*/
void setmV2(int d)
{
mV2 =d;
dac2.setVoltage(map(d, 0, refV2, 0, 4095), false);
}
/*
* setV2()
* sets Voltage value value in volts such as 3.764
* Written Sep 25, 2022
* by Ahmad Shamshiri www.Robojax.com
*/
void setV2(float d)
{
V2= d;
dac2.setVoltage( map((d *1000), 0, refV2, 0, 4095), false);
}
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