Ameter Unit



Ameter Unit is a current meter that can monitor the current in real time. The 16-bit ADS1115 ADC (analog-to-digital) converter can be used to communicate through I2C protocol (By default the I2C address is 0X48 unless manually modified).

In order to ensure the measurement accuracy, there is a built-in DC-DC isolated power supply.

The I2C interface is also electrically isolated through the low-power isolator module CA-IS3020S, This prevents noise and surges on the data bus or other circuits from entering the local ground terminal to interfere or damage sensitive circuits.

Each Unit is factory calibrated with initial accuracy of 0.1%FS, ±1 count and resolution of 0.3mA.

The unit has a maximum measurement current of ±4A, and an internal integrated 4A fuse to prevent excessive measurement current from burning out the circuit.

? EEPROM (0x51) has built-in calibration parameters when leaving the factory. Please do not write to the EEPROM, otherwise the calibration data will be overwritten and the measurement results will be inaccurate.

Product Features

  • ±4A range
  • 16-bit ADC conversion
  • Inital Accurancy 0.1%FS, ±1 count
  • Resolution 0.3mA
  • LED power indicator
  • 4A Slow-blow Fuse
  • Factory calibration (Cal data saved in on-board EEPROM)
  • Built-in I2C isolator CA-IS3020S
  • Isolated DC-DC
  • Development platform: Arduino, UIFlow (under development)
  • 2x LEGO compatible holes


  • 1x Ameter Unit
  • 1x Grove Cable (20cm)


  • galvano-meter
  • electricity monitoring
  • power management monitoring


Resources Parameter
Measuring range ±4A
Communication protocol I2C:0x48
Net Weight 9g
Gross Weight 24g
Product Size 65*24*8mm
Package Size 67*53*12mm

Measurement Range Gain Setting

There are different range of resolutions, the % of error values for each result might be different as well. please set the appropriate range according to the application needs in order to maximize the accuracy. Do not write the values into the EEPROM, If you'd like to save the custom calibration values to EEPROM,Using the following example, the factory data will be lost (overwritten)

Absolute maxium 6A Do not exceed it, otherwise the equipment will be burnt down.

Current measurement rangeMaximum input current(A)Power dispensation(W)Minimum resolution(mA)Gain factor


EasyLoader is a concise and fast program writer, which has a built-in case program related to the product. It can be burned to the main control by simple steps to perform a series of function verification.

Download Windows Version Easyloader Download MacOS Version Easyloader

Measuring current, gear 0.512, maximum input current 5A, analog pointer shows range 2A







Last updated: 2020-12-10