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There are many ways to communicate with remote Arduinos. I have found that many of them hit a slightly higher price point than what I would like. Also, ethernet shields (and wifi dito?) consume many valuable hardware pins. I will describe how to communicate host to Arduino using commercially available wireless serial ports. They are cheap(ish) and only use the rx/tx pins. The drawback is that the air-protocol isn't encrypted so I wouldn't use it for sensitive applications. I use it to control lighting. I would be more impressed than offended if a neighbour hacked my indoor lighting. Serial ports (even wireless) are designed for point to point communication. It is possible to use in one-to many or other constellations but certaing design consideration have to be taken. My Arduino library referenced in step 5 supports one-to many. The described project is for one-way or two-way communication using (i. e. transciever). If you know you will only send commands 'blindly' you can attach a transmitter to the PC end and a receiver to the Arduino. Those modules are really cheap.
Arduino Serial Port Communication In C++
Arduino Serial Port Communication Configuration
Serial communications can be used in many ways, but in this situation we will use it to turn off and on an LED. Just add an LED to pin 13 and ground. Then connect your USB cable. Create an integer to store the incoming serial byte. I decided to name it 'inByte' In the void setup, set pin 13 as an output and use 'Serial.begin(< baud rate >);' to initiate the serial communication. We used 9600bits per second, so we added - Serial.begin(9600); in the void loop we first need to know when a byte is available to be read. So, we use 'Serial.available()' This function returns the number of bytes that are available to be read. So, if we use 'if(Serial.available() > 0)', we know there is at least one byte that we can read. inside that if statement, we need to read the byte and store it for later use. we will use 'Serial.read()', which will read the byte. then we will save it to inByte. In total, this line read: inByte = Serial.read(); While still being inside the main if statement (<'if(Serial.available() > 0)>) we add if statements. To read or write a letter to a variable, we will put the letter in single quotation marks. We wanted our LED to turn on if we sent an 'a' to the Arduino. Thus, our if statement read: 'if(inByte 'a')' inside the if statement we added set the pin to HIGH. Also, we used 'Serial.println()' so that the arduino will notify us, right within the Serial monitor, that it has read an 'a' and has turned on the LED. This if statement looked like this: if(inByte 'a') { // byte is 'a' digitalWrite(13, HIGH); Serial.println('LED - On'); } We also wanted the LED to turn off if any other letter was read. so we added an else statement which turned the LED off. This all may seem confusing, but it is easier to understand if you look at the final code on the next page.