Gravity: I2C 4-20mA DAC Module

I2C DAC module with 0–25 mA output range, calibrated to the standard 4–20 mA industrial current loop. Compatible with Arduino; useful for driving actuators such as motors and pumps.

VCC
Gravity/I2C logic-side power input. The DFRobot wiki specifies 2.7V-5V I2C signal high level, and the schematic labels the connector VCC net.
Type · powerVoltage · logic side 2.7V-5V I2C signal high level from wiki specification
GND
Ground reference on the Gravity/I2C connector and output-side terminal blocks, labelled GND in the DFR0972 schematic.
Type · groundVoltage · 0V
SCL
I2C clock line. The DFR0972 schematic labels SCL on the connector and the wiki identifies I2C control.
Type · signalVoltage · I2C high level 2.7V-5V from wiki specification
SDA
I2C data line. The DFR0972 schematic labels SDA on the connector and the wiki identifies I2C control.
Type · signalVoltage · I2C high level 2.7V-5V from wiki specification
VIN
External supply input for the 4-20mA/current-output side, labelled VIN in the DFR0972 schematic.

Converters

114 other options

ADS1115/MCP3421 ADCs, MCP4725 and GP8413 DACs, CP2102 USB-UART boards, and I2C plumbing like the LTC4316 address shifter — matched to bus, resolution and signal range.

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CP2102 USB UART Board (mini) visual preview

Related groups

4 groups

LED pixels

WS2812/SK6812 NeoPixel strips, rings and Jewels, APA102 DotStar pixels, and plain analog RGB strips — each matched to its protocol and host, not just its connector.

Components · Addressable LEDs · 176 parts

Bare ICs

74HC logic gates, MCP3008/MCP23017 ADCs and expanders, 24LC256 EEPROM, 4N25-series optocouplers and ULN2803A drivers — bare DIP chips with no breakout-board conveniences like pull-ups or level shifting.

Components · Integrated circuits · 68 parts

Memory

24LC32/25LC256 EEPROM, I2C FRAM, 64Mbit PSRAM, and microSD breakouts up to 64GB — matched to write frequency and data volume, not just interface.

Components · Memory & storage · 39 parts

Passives

E12 resistor kits, ceramic and electrolytic capacitor sets, 1N4148/1N4007 diodes, TIP120 Darlingtons, IRLZ44N MOSFETs and 100F supercapacitors — bench stock in kit quantities.

Components · Passives · 56 parts

Pin	Type	Function	Voltage
VCC	power	Gravity/I2C logic-side power input. The DFRobot wiki specifies 2.7V-5V I2C signal high level, and the schematic labels the connector VCC net.	logic side 2.7V-5V I2C signal high level from wiki specification
GND	ground	Ground reference on the Gravity/I2C connector and output-side terminal blocks, labelled GND in the DFR0972 schematic.	0V
SCL	signal	I2C clock line. The DFR0972 schematic labels SCL on the connector and the wiki identifies I2C control.	I2C high level 2.7V-5V from wiki specification
SDA	signal	I2C data line. The DFR0972 schematic labels SDA on the connector and the wiki identifies I2C control.	I2C high level 2.7V-5V from wiki specification
VIN	power	External supply input for the 4-20mA/current-output side, labelled VIN in the DFR0972 schematic.	18V-24V supply, 24V recommended, from wiki specification
VOUT	signal	Analogue current output terminal, labelled VOUT in the DFR0972 schematic. The wiki specifies 0-25mA output current and calibrated 4-20mA use.	current output 0-25mA, calibrated 4-20mA use from wiki specification

Pinout

LED pixels

Bare ICs

Memory

Passives