analogRead()

analogRead()

analogRead() reads the raw analog value of the specified channel.

int analogRead(uint8_t pin)

Commands

Command	Arguments	Return Value	Operation
`analogRead(pin)`	`uint8_t pin` — On MPAINO, `0` ~ `19` are overall analog input module channel numbers	`int`	Reads the raw analog value of the specified channel.

Example

This example uses MPAINO-8A8R(T) with two X input modules. Select Analog Input Module → X2 in Arduino IDE. CH0 on X1 is 0; CH0 on X2 is 4.

void setup() {
  Serial.begin(115200);
}
 
void loop() {
  const int first = analogRead(0);  // Read the raw analog value from X1 CH0.
  const int second = analogRead(4);  // Read the raw analog value from X2 CH0.
  Serial.print(F("X1 CH0: "));
  Serial.println(first);
  Serial.print(F("X2 CH0: "));
  Serial.println(second);
  delay(500);
}

Precautions

On MPAINO, analogRead(0~19) returns a raw ADS1118 ADC value, not a value converted to voltage, current or temperature units.
For 4~20mA software cutoff and open-circuit detection, use analogRead2(A pin) on MPINO or analogRead2(module channel) on MPAINO.
Set the sampling rate with analogReadInit(sps). If not configured, it follows the analogRead() default.
The maximum averaging sample count is 20. If samples = 0 or memory allocation fails, return the current raw value.
Using both averaging functions allocates separate dynamic buffers and increases SRAM usage.
The MPAINO analog input module's DIP switches and actual wiring must match the input type.

Built-in Commands in the Same Category

← Built-in Command List

Table of Contents

analogRead()

Commands

Example

Precautions

Built-in Commands in the Same Category