M5Stack Voltmeter Unit (ADS1115)

🔌 M5Stack Voltmeter Unit (ADS1115) The Voltmeter Unit is a high-precision voltage monitoring module designed for real-time measurement. At its core is the 16-bit ADS1115 analog-to-digital converter, communicating via the I2C protocol (address: 0x49).

⚡ Isolated Power & Communication To ensure measurement stability and protect sensitive components, the unit features:

• A built-in DC-DC isolated power supply

• Electrical isolation of the I2C interface using the low-power CA-IS3020S isolator

This dual isolation design effectively shields the system from electrical noise and surges that may propagate through the data bus or external circuits, preventing interference or damage to the local ground and sensitive electronics.

🎯 Factory Calibration & Accuracy Each Voltmeter Unit undergoes individual calibration before shipment, achieving:

• Initial accuracy of 0.1%FS ±1 count

• Maximum measurable voltage range of ±36V

🧠 EEPROM Calibration Data Factory calibration parameters are stored in the onboard EEPROM (address: 0x53). ⚠️ Important: Do not overwrite the EEPROM. Modifying its contents will invalidate the calibration data and compromise measurement accuracy.

Features

🔧 M5Stack Voltmeter Unit – Key Specs

• ⚡ Voltage Range: ±36V

• 💡 Power Indicator: LED status light

• 🎯 Precision Conversion: 16-bit ADC (ADS1115)

• 📐 Resolution:

  • ≤16V ➜ 1mV/count

• ✅ Accuracy: 0.1%FS ±1 count (factory calibrated)

• 🛡️ Signal Isolation: CA-IS3020S chip for anti-interference

• 🔌 Power Isolation: Built-in DC-DC converter

• 🔥 Isolation Rating: Up to 1000 VRMS withstand voltage

• 💻 Development Support: Arduino ✅ | UIFlow 🚧 (in progress)

• 🧱 Mounting: 2x LEGO-compatible holes for easy integration

Includes

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

Application

• voltmeter

Specification

Model Size

Software

Unit VMeter with M5Core

Unit VMeter with M5Core2

Unit VMeter with M5Atom

Unit VMeter with M5StickC