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How to Read Text Files from a PC or SD Card Using Arduino Serial
Arduino is a popular platform for creating interactive projects with sensors, motors, LEDs, and other components. One of the features of Arduino is its ability to communicate with other devices using serial communication. Serial communication is a way of sending and receiving data over a single wire or wireless connection.
In this article, we will learn how to read text files from a PC or SD card using Arduino serial. Text files are files that contain plain text without any formatting or special characters. They can be used to store data, settings, commands, or messages for Arduino projects.
Reading Text Files from a PC
To read text files from a PC, we need two things: a program on the PC that can read the file and send it over serial to the Arduino, and a program on the Arduino that can receive and process the data.
One way to create a program on the PC is to use Python, a versatile and easy-to-learn programming language. Python has a built-in module called serial that can handle serial communication with Arduino. We can use the open() function to open a text file and the readline() function to read each line of the file. We can then use the write() method of the serial object to send each line to the Arduino. Here is an example of a Python program that reads a text file called data.txt and sends it over serial to the Arduino:
```python
import serial # import the serial module
ser = serial.Serial('COM3', 9600) # create a serial object with port name and baud rate
file = open('data.txt', 'r') # open the text file in read mode
while True: # loop forever
line = file.readline() # read a line from the file
if not line: # if there is no more line
break # exit the loop
ser.write(line.encode()) # send the line to the Arduino as bytes
file.close() # close the file
ser.close() # close the serial connection
```
To receive and process the data on the Arduino, we need to use the Serial library that comes with the Arduino IDE. The Serial library provides functions and methods for serial communication with other devices. We can use the Serial.available() function to check if there is any data in the serial buffer, and the Serial.read(), Serial.readString(), or Serial.parseInt() functions to read different types of data from the buffer. We can then use conditional statements or switch cases to perform different actions based on the data received. Here is an example of an Arduino sketch that reads text data from serial and turns on or off an LED depending on the message:
```c++
int ledPin = 13; // pin number of LED
void setup() {
pinMode(ledPin, OUTPUT); // set LED pin as output
Serial.begin(9600); // start serial communication at 9600 baud rate
}
void loop() {
if (Serial.available() > 0) { // if there is data in the serial buffer
String message = Serial.readString(); // read a string from serial
message.trim(); // remove any whitespace at the end of string
if (message == \"ON\") { // if message is ON
digitalWrite(ledPin, HIGH); // turn on LED
Serial.println(\"LED ON\"); // send feedback to PC
}
else if (message == \"OFF\") { // if message is OFF
digitalWrite(ledPin, LOW); // turn off LED
Serial.println(\"LED OFF\"); // send feedback to PC
}
else { // if message is something else
Serial.println(\"Invalid message\"); // send error message to PC
}
}
}
```
Reading Text Files from an SD Card
To read text files from an SD card, we need two things: an SD card module that can interface with Arduino, and an SD card that contains the text file.
An SD card module 061ffe29dd