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Single-Channel 4-20 mA Analog Input Unit with I2C and Electrical Isolation
The M5Stack U162 Unit AIN4-20mA is a single-channel 4-20 mA analog current measurement module designed for connecting industrial current-output sensors to M5Stack controllers. It uses an STM32G030F6P6 microcontroller to acquire and process the analog signal and communicates with the host through an I2C interface. This makes it suitable for integrating common 4–20 mA industrial transmitters into monitoring, automation, and data-acquisition systems.
The unit incorporates an HCNR200 isolation device and an SGM321YC5/TR operational amplifier circuit to provide electrical isolation and reliable current-signal measurement. Jumper caps allow the wiring configuration to be changed for 2-wire or 4-wire sensors and for internally or externally powered sensor arrangements. The HY2.0-4P Grove interface provides power and I2C communication with the host, while the removable HT3.96-4P terminal simplifies connection to industrial sensors and external wiring.
Key Features
- Single-channel 4–20 mA analog current measurement
- STM32G030F6P6 microcontroller
- I2C communication with M5Stack host controllers
- Default I2C address: 0x55
- Programmable I2C address
- Supports 2-wire and 4-wire current sensors
- Sensor wiring mode selectable using jumper caps
- Supports internally and externally powered sensor configurations
- HCNR200 electrical signal isolation
- SGM321YC5/TR operational amplifier
- 200Ω typical differential input impedance between IN+ and IN−
- 12-bit ADC measurement data available through I2C
- Current reading available with 0.01 mA register resolution
- HY2.0-4P Grove host interface
- HT3.96-4P removable terminal for sensor connections
- Designed for standard industrial 4–20 mA sensing applications
- Supports UiFlow1, UiFlow2, and Arduino development
Applications
- Power-system equipment monitoring
- Industrial process control
- Motor monitoring and control
- Energy-management systems
- Industrial sensor interfacing
- PLC and automation prototypes
- Pressure transmitter monitoring
- Flow transmitter monitoring
- Liquid-level monitoring
- Temperature transmitter interfacing
- Industrial IoT data acquisition
- Remote equipment monitoring
Model Size
Package Includes:
- 1 x Unit AIN4-20mA
- 1 x HT3.96-4P Terminal
- 1 x HY2.0-4P Grove Cable (20 cm)
- 3 x Jumper Cap
