DFRobot
Gravity: I2C 12-Bit DAC Module
The DFRobot Gravity 12-Bit I2C DAC Module is a compact digital-to-analogue converter based on the MCP4725 chip. It accurately converts digital values to prec...
The DFRobot Gravity 12-Bit I2C DAC Module is a compact digital-to-analogue converter based on the MCP4725 chip. It accurately converts digital values to precise analogue voltage signals, providing far cleaner output than PWM-based approaches from microcontrollers.
With on-board EEPROM, the module retains its last DAC setting during power-off and automatically resumes output on power-up. An I2C address selection switch allows two modules to operate on the same bus (0x60 and 0x61). The included library supports generating sine, triangular, and arbitrary waveforms with just a few parameters.
Key Features
- 12-Bit Resolution – Accurate analogue output from 0 V to VCC
- On-Board EEPROM – Retains DAC value during power-off for seamless resume
- Wide Voltage Support – Compatible with both 3.3 V and 5 V controllers
- Gravity I2C Interface – Plug-and-play connector with XH2.54 4-pin header for expansion
- Dual Address Selection – Switch between 0x60 and 0x61 for cascading two modules
- Waveform Generation – Built-in library functions for sine, triangular, and arbitrary waveforms
- Ultra-Low Power – Working current under 0.2 mA
Specifications
- DAC Chip – MCP4725
- Input Voltage (VCC) – 3.3–5.0 V
- Output Voltage – 0 V to VCC
- Resolution – 12-bit
- Working Current – <0.2 mA
- Interface – Gravity I2C (logic level: 0–3.3 V)
- I2C Addresses – 0x60, 0x61 (selectable via switch)
- Dimensions – 27 × 22 mm
- Weight – 13.8 g
Ideal For
- Sensor calibration and testing
- Automatic control systems
- Function and waveform generation
- Precise voltage reference applications
- Arduino and Raspberry Pi projects requiring clean analogue output
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- 12-bit resolution
- 12-bit resolution means the sensor’s measurement is divided into 4096 possible digital values. Higher resolution can make small changes in motion or tilt easier to detect, as long as the sensor range and noise are suitable for the project.
- DAC
- A digital-to-analogue converter turns numbers from the microcontroller into a real analogue voltage. It matters if you want to generate simple waveforms, audio-style signals, or variable control voltages rather than just on/off outputs.
- EEPROM
- A type of non-volatile memory that keeps stored data even when power is turned off. In a sensor module, it can be used to store settings or calibration data so they do not need to be re-entered every time.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- voltage reference
- A stable voltage the ADC compares inputs against when converting them to numbers. A more stable reference helps produce more consistent measurements, especially in precision sensing and instrumentation.
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Brands
Supplier page — dfrobot.com
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