Design with Adafruit MCP4728 in Cirkit DesignerThe Adafruit MCP4728 is a versatile and precise multi-channel digital-to-analog converter (DAC) module. It is equipped with four independent 12-bit DAC channels, enabling the conversion of digital signals into analog voltages. This module is ideal for applications requiring multiple analog outputs, such as generating audio signals, controlling variable lighting, or driving analog sensors. It interfaces with microcontrollers via the I2C protocol, making it a convenient addition to projects that require analog capabilities but are limited to digital-only outputs.
This circuit is a sensor and display system powered by an ESP32 microcontroller. It integrates multiple sensors (BH1750 light sensor, BMP280 pressure sensor, DS3231 RTC, and DS18B20 temperature sensor) and drives a series of MAX7219 8x8 LED matrices for visual output. The ESP32 communicates with the sensors via I2C and controls the LED matrices to display data.
Open Project in Cirkit Designer
This circuit uses an Arduino UNO to interface with an Adafruit TCS34725 RGB color sensor, a 128x64 OLED display, and a 16x2 I2C LCD. The Arduino reads color data from the sensor and displays the color information on both the OLED and LCD screens.
Open Project in Cirkit Designer
This circuit connects a Raspberry Pi 5 to an Adafruit MCP4728 DAC via I2C communication. The Raspberry Pi provides power and ground to the DAC, and uses GPIO pins 2 and 3 for SDA and SCL lines respectively to control the DAC.
Open Project in Cirkit Designer
This circuit is a portable, battery-powered system featuring an Adafruit QT Py RP2040 microcontroller that interfaces with an OLED display, a proximity sensor, an accelerometer, and an RGB LED strip. The system is powered by a lithium-ion battery with a step-up boost converter to provide 5V for the LED strip, and it includes a toggle switch for power control. The microcontroller communicates with the sensors and display via I2C.
Open Project in Cirkit Designer| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | VDD | Power supply (2.7V to 5.5V) |
| 2 | GND | Ground |
| 3 | SCL | I2C clock line |
| 4 | SDA | I2C data line |
| 5 | A0 | Address select bit 0 (I2C address pin) |
| 6 | A1 | Address select bit 1 (I2C address pin) |
| 7 | A2 | Address select bit 2 (I2C address pin) |
| 8 | VOUTA | Analog output for DAC channel A |
| 9 | VOUTB | Analog output for DAC channel B |
| 10 | VOUTC | Analog output for DAC channel C |
| 11 | VOUTD | Analog output for DAC channel D |
#include <Wire.h>
#include <Adafruit_MCP4728.h>
Adafruit_MCP4728 mcp;
void setup() {
Wire.begin(); // Start I2C bus
mcp.begin(0x60); // Initialize MCP4728, default address 0x60
// Set the voltage output of all channels to mid-scale
mcp.setChannelValue(MCP4728_CHANNEL_A, 2048);
mcp.setChannelValue(MCP4728_CHANNEL_B, 2048);
mcp.setChannelValue(MCP4728_CHANNEL_C, 2048);
mcp.setChannelValue(MCP4728_CHANNEL_D, 2048);
mcp.saveToEEPROM(); // Save the current settings to EEPROM
}
void loop() {
// Example: Cycle through voltage levels on channel A
for (uint16_t i = 0; i < 4096; i++) {
mcp.setChannelValue(MCP4728_CHANNEL_A, i);
delay(10);
}
}
Wire.endTransmission() function to check for I2C errors. A return value of 0 indicates success.Q: Can I use the MCP4728 with a 3.3V system? A: Yes, the MCP4728 can operate at voltages as low as 2.7V.
Q: How do I change the I2C address of the MCP4728? A: The I2C address can be changed by adjusting the A0, A1, and A2 pins.
Q: Can I save the DAC output values so they persist after power cycling?
A: Yes, the saveToEEPROM() function will store the current DAC values to the internal EEPROM.
Q: Is it possible to update all DAC channels simultaneously? A: Yes, the MCP4728 supports a multi-write command to update all channels at once.