Product description: ADS1115 Voltmeter - Unit expansion module - M5Stack U087
The M5Stack voltmeter is a compact and reliable voltage measurement module with a built-in 16-bit ADS1115 converter communicating via I2C (address 0x49). Thanks to its isolated DC-DC power supply and CA-IS3020S isolator, the module protects against interference and surges that could damage sensitive circuits. Each unit is factory calibrated to an initial accuracy of 0.1% FS ±1 count, ensuring reliable and repeatable results. The module supports auto-ranging and a resolution of 1 mV (for voltages ≤ 16 V) or 7.9 mV (for voltages > 16 V). Thanks to its compact size, compatibility with Arduino and UIFlow platforms, and compatibility with LEGO systems , the module is ideal for prototyping, electronics testing, and voltage monitoring in educational and professional projects.
ADS1115 voltmeter - Unit expansion module - M5Stack U087k. 
The voltmeter from M5Stack is a compact and reliable voltage measurement module.Special features
- Voltage measurement in the range of ±36 V
- LED indicating power supply presence
- High-precision 16-bit ADS1115 converter with automatic ranging
- Factory Accuracy: 0.1% FS ±1 count
- Electrical isolation using DC-DC power supply and CA-IS3020S isolator
- Surge resistance up to 1000 VRMS
- Compatible with Arduino and UIFlow platforms
- Two mounting holes adapted to the LEGO system
Practical applications
- Voltage measurement in electronic systems and prototypes
- Voltage monitoring for DIY and educational projects
- Integration with Arduino and control systems for automation and robotics
- Safe measurement in systems with potential overvoltages or interference
Technical specifications of the module
- Resolution: automatic mode for voltages ≤ 16 V: 1 mV; for voltages > 16 V: 7.9 mV
- Measurement range: ±36 V
- Initial accuracy: 0.1% FS ±1 count
- Interface: I2C (0x49)
- Dimensions: 65 x 24 x 8 mm
- Weight: 9g
Contents of the set
- 1x Voltmeter
- 1x Grove Cable
Each unit is factory calibrated to an initial accuracy of 0.1% FS ±1 count, ensuring reliable and repeatable results. 
