Voltmeter Unit{docsify-ignore-all}

SKU:U087

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.

Product Features

±36V range
LED power indicator
16-bit ADC conversion
Resolution: Auto range, Count ≤ 16V, 1mV; Count > 16V, 7.9mV
Inital 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)

Application

voltmeter

Specification

Resources	Parameter
Resolution	Auto range, Count ≤ 16V, 1mV; Count > 16V, 7.9mV
Measuring range	±36V
Inital Accurancy	0.1%FS, ±1 count
Communication protocol	I2C：0x49
Net Weight	9g
Gross Weight	24g
Product Size	65248mm
Package Size	675312mm

Measurement Range Gain Setting

Different range resolution is different, the error value of the result is different, please set the appropriate range according to the needs.Do not write EEPROM.If you really want to save the custom calibration values to EEPROM，Using the following statement, the factory data will be lost once written


bool Voltmeter::saveCalibration2EEPROM(voltmeterGain_t gain, int16_t hope, int16_t actual)

//@Parameter: voltmeterGarin_t gain //Set Gain
###########################################
# // | PAG      | Max Input Voltage(V) |  #
# // | PAG_4096 |        128            |  #
# // | PAG_2048 |        64            |  #
# // | PAG_1024 |        32            |  #
# // | PAG_512  |        16            |  #
# // | PAG_256  |        8             |  #
###########################################
//@Parameter: int16_t hope  // Set target value
//@Parameter: int16_t actual //ADC raw value

Voltage measurement range	Maximum input DC voltage(V)	Minimum resolution(mV)	Gain factor
PAG_4096(Calibrated)	±128	7.85	0.125
PAG_256(Calibrated)	±8	0.49	0.007813

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. Please install the corresponding driver according to the device type. M5Core host Please click here to view the CP210X driver installation tutorial, M5StickC/V/T/ATOM series can be used without driver)