Error handling in embedded projects in Arduino

Introduction

Error handling helps your device keep working even when something goes wrong. It makes your project more reliable and safe.

When reading data from sensors that might fail or give wrong values.

When communicating with other devices and the connection might drop.

When saving data to memory that might be full or corrupted.

When controlling motors or actuators that might get stuck or overload.

Syntax

Arduino

// Example of simple error check
if (sensorValue == ERROR_CODE) {
  // handle error
} else {
  // normal operation
}

Arduino C++ does not support try-catch like some languages.

Use if-else checks and return codes to detect errors.

Examples

Check if sensor returns -1 as error, then print message.

Arduino

int sensorValue = readSensor();
if (sensorValue == -1) {
  Serial.println("Sensor error detected");
} else {
  Serial.println(sensorValue);
}

Check if writing to memory failed and print error.

Arduino

bool success = writeMemory(data);
if (!success) {
  Serial.println("Memory write failed");
}

Simple check for input pin state, can detect if button is pressed or not.

Arduino

if (digitalRead(buttonPin) == LOW) {
  // Button pressed
} else {
  // Button not pressed
}

Sample Program

This program reads a sensor value. If the value is too high (above threshold), it treats it as an error and prints an error message. Otherwise, it prints the sensor value.

Arduino

#include <Arduino.h>

const int sensorPin = A0;
const int errorThreshold = 1000; // example error threshold

void setup() {
  Serial.begin(9600);
}

int readSensor() {
  int value = analogRead(sensorPin);
  if (value > errorThreshold) {
    return -1; // error code
  }
  return value;
}

void loop() {
  int sensorValue = readSensor();
  if (sensorValue == -1) {
    Serial.println("Error: Sensor reading out of range!");
  } else {
    Serial.print("Sensor value: ");
    Serial.println(sensorValue);
  }
  delay(1000);
}

Important Notes

Always define clear error codes or conditions for your sensors or devices.

Use Serial prints or LEDs to show errors for easier debugging.

Keep error handling simple to avoid slowing down your embedded system.

Summary

Error handling keeps your embedded project safe and reliable.

Use if-else checks and return codes to detect problems.

Show errors clearly using Serial or LEDs for easy fixing.