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, inital Accurancy 0.1%FS, ÷1 count, and a maximum measurement voltage of ÷36V.
Features
÷36V range
LED power indicator
16-bit ADC conversion
Resolution:Auto range, Count 16V, 1mV; Count > 16V, 7.9mV
Inital Accurancy 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:Arduin, UIFlow (under development)
2x LEiGO compatible holes
Package Included
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
Protocol:I2C
Net Weight:9g
Gross Weight:24g
Product Size:65*24*8mm
Package Size:67*53*12mm
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 | 64 |
// | PAG_2048 | 32 |
// | PAG_512 | 16 |
// | PAG_256 | 8 |
//@Parameter:int16_t hope // Set target value
//@Parameter:int16_t actual //ADC raw value
ADC1115_Reference calibration:Calibration voltage(V):Expected reading(int16)
PGA4096(4.096):60:7641
PGA512(0.512):5:5094
Voltage measurement range:Maximum input voltage(V):Minimum resolution(mV):Gain factor
4.096:128.6516364:7.852272727:0.125
2.048:64.32581818:3.926136364:0.0625
1.024:32.16290909:1.963068182:0.03125
0.512:16.08145455:0.981534091:0.015625
0.256:8.040727273:0.490798455:0.007813
Datasheet
CA-IS3020S
ADS1115
PinMap
M5Core(GROVE A):SDA(GPIO21):SCL(GPIO22):5V:GND
V Meter Unit:SDA:SCL:5V:GND
Example
1. Arduin IDE
Click here to download the Arduin example
Additional information
| Weight | 0.023 kg |
|---|
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