Unit VMeter
Description
Voltmeter Unit is a voltage meter that can monitor the voltage in real time. The 16-bit ADC (analog-to-digital) converter ADS1115 is used internally to communicate through I2C (0X49).
In order to ensure the measurement accuracy, there is a built-in DC-DC isolated power supply, and the I2C interface is also electrically isolated through the low-power isolator 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 individually calibrated when leaving the factory, initial accuracy of 0.1%FS, ±1 count, and a maximum measurement voltage of ±36V.
EEPROM (0x53) 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
- ±36V range
- LED power indicator
- 16-bit ADC conversion
- Resolution: Auto range, Count ≤ 16V, 1mV; Count > 16V, 7.9mV
- Initial accuracy 0.1%FS, ±1 count
- Built-in CA-IS3020S isolation chip, anti-interference
- Isolated DC-DC
- Up to 1000 VRMS isolation withstand voltage
- Development platform: Arduino, UIFlow (under development)
- 2x LEGO compatible holes
Includes
- 1x Voltmeter Unit
- 1x Grove Cable(20cm)
Applications
- voltmeter
Specifications
| Resources | Parameter |
|---|---|
| Resolution | Auto range, Count ≤ 16V, 1mV; Count > 16V, 7.9mV |
| Measuring range | ±36V |
| Initial Accuracy | 0.1%FS, ±1 count |
| Communication protocol | I2C:0x49 |
| Net Weight | 9g |
| Gross Weight | 24g |
| Product Size | 65*24*8mm |
| Package Size | 136*92*12mm |
EasyLoader
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.
Measuring voltage, gear 0.512, maximum measuring voltage 16V, analog pointer indicating range 5V ( https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/unit/ADS1115.PDF )
PinMap
| M5Core(GROVE A) | SDA(GPIO21) | SCL(GPIO22) | 5V | GND |
|---|---|---|---|---|
| V Meter Unit | SDA | SCL | 5V | GND |
Schematic
Related Link
- Datasheet
- CA-IS3020S
- ADS1115
Model Size
Example
Arduino
- M5Unit-Vmeter with M5Core
- M5Unit-Vmeter with M5Core2
- M5Unit-Vmeter with M5Atom
- M5Unit-Vmeter with M5StickC
