DFRobot Gravity I2C 4-20mA DAC Module

The DFRobot Gravity I2C 4-20mA DAC Module is an Arduino-compatible digital-to-analogue converter that generates a calibrated 4-20 mA current output for process control.

Overview

The module produces a 0-25 mA signal and, after calibration, provides a 4-20 mA output, the standard signal used in process control. It can be driven directly from an Arduino or other microcontroller, making it suitable for interfacing with a range of industrial devices. Built around the GP8302 chip, the module has a linearity error of 0.2% after calibration. It features a Gravity interface for connection with other Gravity ecosystem sensors and uses a straightforward I2C communication protocol, which simplifies integration into projects.

Key Features

• Arduino-compatible digital-to-analogue converter
• 0-25 mA signal output, calibrated to 4-20 mA
• Linearity error of 0.2% after calibration
• Gravity interface for connection with Gravity ecosystem sensors
• I2C communication protocol with a fixed address of 0x58

Applications

The module can be programmed via Arduino to drive and regulate variable speed motors, inverters, control valves, and pumps. It can also be used to create function signal generators, design automatic controllers for lighting displays or fountains, and support the rapid prototyping or debugging of electromechanical systems and small test rigs.

Electrical and Environmental Specifications

The module operates from an 18-24 V DC power supply and is compatible with I2C signal levels from 2.7 V to 5 V. Power consumption is below 5 mA, and the start-up time is under 2 ms. The operating temperature range is -40°C to 125°C. The load capacity is up to 450 ohms with an 18 V supply and up to 750 ohms with a 24 V supply.

Physical Details

The module is supplied as a compact unit measuring 3.3 (width) x 1.5 (depth) x 4.3 (height) and weighing 19 g. It is suited to engineers, hobbyists, and educators developing control and automation projects.