The 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 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 an 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. The 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. 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 Package Contents * 1x Ameter Unit * 1x Grove Cable (20cm) Specifications Resources Parameter Measuring range ±4A Communication protocol I2C：0x48 Net Weight 9g Gross Weight 24g Product Size 65 x 24 x 8mm Package Size 67 x 53 x 12mm Resources * Documents https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2023-03-07 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2023-11-02 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2023-12-27 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2024-09-19 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2024-11-29 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2024-11-30 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2025-04-29 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2025-08-05 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2025-11-28 https://elecena.pl/product/22723871/m5stack-ammeter-unit-ads1115 2025-11-29