INTRODUCTION

DAC series modules are a range of products that can be controlled through I2C or PWM signals to generate voltage or current output signals. They possess the capability to produce a variety of analog voltage or current signals, including 0-5V, 0-10V, 0-2.5V, 0-VCC, and 0-25mA.

An analog quantity refers to the continuous variation of voltage magnitude (or current magnitude) within a specific range. Due to its stability, long transmission distance, and ease of use, it has found widespread application in the field of industrial automation control, including:

Motor speed control
Sound intensity control
Temperature regulation
Adjustment of light brightness
Valve angle modulation

etc.

This series of DAC products not only offers a variety of output signal ranges, but also provides three selectable resolutions: 8-bit, 12-bit, and 15-bit. It allows for the choice of either single-channel or dual-channel configurations, and multiple modules can be cascaded to form a multi-channel output. When coupled with Arduino controllers, Raspberry Pi, STM32, and similar controllers, it finds application in various automation control scenarios, including:

Laboratory testing equipment
Automatic motor speed control
Indoor and outdoor lighting control
Automated volume adjustment
Backlight control for displays

etc.

The following table presents the functional parameters of each DAC product for reference in the selection process.

DFR1035 GP8512 （1-Channel 15bit I2C to 0-2.5V/VCC DAC Module）

FUNCTIONS

This is a 1-channel analog voltage output DAC module with I2C communication, 15-bit resolution, and 0.01% output voltage linearity error. It is well-suited for control projects operating within the 3.3V range, such as ESP32, Raspberry Pi, STM32, and other microcontrollers that require analog signal output.

The high precision and resolution of this module make it suitable for control scenarios that require higher signal accuracy, such as fine speed control or angle control.

FEATURES

Support 3.3V-5V power supply.
Output voltage linearity error of 0.01%.
Two channels of voltage output, either 0-2.5V or 0-VCC, enabling connection and control of standard analog voltage devices.
Gravity interface, I2C communication, Arduino control, suitable for program automation control.
The high precision and resolution of this module make it suitable for control scenarios that require higher signal accuracy.

DIMENSION

FUNCTIONAL DIAGRAM

Name	Description	Remarks
12C Interface	+	Positive terminal of the power supply (3.3V-5V)
	-	Negative terminal of the power supply
	C	SCL
	D	SDA
0-2.5V/0-VCC Switching Switch	0-VCC	Switch output voltage to 0V-VCC(Supply voltage)
	0-2.5V	Switch output voltage to 0V-2.5V
Voltage Signal Output Port	VOUT	Positive terminal of output voltage signal
	GND	Negative terminal of the output voltage signal

SPECIFICATIONS

Chip Type: GP8512
Operating Voltage: 3.3V-5V
Output Voltage: 0-2.5V or 0-VCC
Number of Channels: 1 channel
Communication Method: I2C
Resolution: 15-bit
Value Range: 0 - 32767 corresponding to 0-2.5V or 0-VCC
Output voltage linearity error: 0.01%

TUTORIAL

In this example，We will demonstrate the generation of distinct voltage values under two different conditions.

Input signal value range: 0 - 32767

In the state of 0-2.5V： input 24903, resulting in an output of 1.9V.
In the state of 0-VCC： input 24903, resulting in an output of 3.8V.

SOFTWARE REQUIREMENTS

Download Arduino IDE： Click to download Arduino IDE
Download Arduino libraries： Click to download https://github.com/DFRobot/DFRobot_GP8XXX

Click the link to view：How to install the library?;

Note: All modules in this series utilize the same library.

HARDWARE CONNECTION

SAMPLE CODE

#include <DFRobot_GP8XXX.h>

DFRobot_GP8512 GP8512;

void setup() {

  Serial.begin(9600);

  while(GP8512.begin()!=0){
    Serial.println("Communication with the device has encountered a failure. Please verify the integrity of the connection or ensure that the device address is properly configured.");
    delay(1000);
  }

  /**
   * @brief. Set the output DAC value.
   * @param data. Data values corresponding to voltage values
   * @n (0 - 32767) This module is a 15-bit precision DAC module, hence the values ranging from 0 to 32767 correspond to voltages of 0-2.5V or 0-VCC respectively. The specific voltage range depends on the selection of the module's voltage fluctuation switch.
   */
  GP8512.setDACOutVoltage(24903);//Output voltage of 1.9V under the 0-2.5V state and 3.8V under the 0-VCC state.

  delay(1000);
  //The set voltage is saved internally in the chip for power-off retention.
  //GP8512.store();
}

void loop() {

}

RESULT

After downloading the program, the voltmeter was used to measure the actual output voltage of 1.9V under the 0-2.5V state and 3.8V under the 0-VCC state.

FAQ

For any questions, advice or cool ideas to share, please visit the DFRobot Forum.

DFR1035_1_Channel_15bit_I2C_to_0-VCC_DAC WIKI