Analog Input 0-30V

Description

This feature is present on all several modules:

OI-Core/OI-CoreLite (x2)
OI-Discrete (x2)

It enables the reading of conditioned voltage within the range of 0 to 30V, making it especially handy for monitoring supply voltage or sensor outputs.

Note

When using these analog input, you have to take into account the low input impedance (4.8kΩ). If the application need an a analog reading with high impedance and better precision, please check spec of OI-AnalogLS or OI-Mixed.

Characteristics

Analog input specifications
Requirements	Value	Remark
Resolution	12 bits
Sampling frequency	500Hz	Only ‘oneshot’ reading is supported
Minimum input voltage	0V
Maximum input voltage	30V
Input impedance (Voltage mode)	4.8kΩ
Precision	100mV

Code examples

The example code above demonstrates how to read the voltage of an input on an OI-Discrete module.

#include "OpenIndus.h"
#include "Arduino.h"

OICore core;

int value = 0;

void setup(void)
{
    Serial.begin(115200);
}

void loop(void)
{
    value = core.analogRead(AIN_1);
    Serial.print("AIN_1 :");
    Serial.println(value);

    value = core.analogRead(AIN_2);
    Serial.print("AIN_1 :");
    Serial.println(value);

    value = core.analogReadMilliVolt(AIN_1);
    Serial.print("AIN_1 :");
    Serial.print(value);
    Serial.println("mV");

    value = core.analogReadMilliVolt(AIN_2);
    Serial.print("AIN_2 :");
    Serial.print(value);
    Serial.println("mV");

    delay(1000);
}

Software API

class AnalogInputsHV

Public Static Functions

static int analogRead(AnalogInput_Num_t num)

Read the value of AIN. The function return an integer that correspond to the internal voltage of the Analog Input in mV. This value is not calibrated and not converted to the real Analog Input voltage. It is strongly recommended to use analogReadVolts or analogReadMillivolts instead.

Parameters:: num – ANA input number.
Returns:: Value of the AIN input.

static float analogReadVolt(AnalogInput_Num_t num)

Read the value of AIN. The function return a float that correspond to the voltage of the ANA (from 0 to 30V).

Parameters:: num – ANA input number.
Returns:: Value of the AIN input.

static float analogReadMilliVolt(AnalogInput_Num_t num)

Read the value of AIN. The function return a float that correspond to the voltage of the ANA (from 0 to 30000mV).

Parameters:: num – ANA input number.
Returns:: Value of the AIN input.

static int setAnalogCoeffs(float *a, float *b)

Set the Analog Coeffs object.

Parameters:

a – slope coefficient
b – y-intercept

Returns:

0 if success, -1 if error

static void getAnalogCoeffs(float *as, float *bs)

Get the Analog Coeffs object.

Parameters:

as – slope coefficient of each Analog Inputs
bs – y-intercept of each Analog Inputs