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Software Serial Example. In the example below, digital pins 10 and 11 on your Arduino or Genuino boards are used as virtual RX and TX serial lines. The virtual RX pin is set up to listen for anything coming in on via the main serial line, and to then echo that data out the virtual TX line. Conversely, anything received on the virtual RX is sent out over the hardware TX. So, now we are gonna write some data on the Serial Port. It’s like we are sending data from Arduino to some other device via Serial Port. For example, you are using GSM module with Arduino then you have to send AT commands to your GSM baord from Arduino and that’s where you use Arduino Serial write. The example reports volume type, free space and other information using the SD library, sending it over the serial port. Also Proteus simulation of the Arduino and SD card is available with a small video. Arduino has a very nice SD card library, with this library the interfacing is very simple. Arduino Serial Example #1 Remote Control Blink: Slave The slave Arduino receives the commands. If it receives a 1 it turns on the lED and if it receives a 0 it turns off the LED.
While today we will have a look at how to send the data through serial port in arduino and for that I am gonna use the Arduino Serial Write command. Its also gonnabe a very simple and basic Arduino tutorial but if you are new to Arduino then you must read it completely as it will gonna help you out. I have also designed a Proteus Simulation and explained it at the end of this tutorial. I hope you guys are gonna learn from it:
How to use Arduino Serial Write ???
- For the basics on Serial Port, you should read What is Serial Port ?
- And as I have explained in my previous tutorial How to use Arduino Serial Read that Arduino has a Serial Port at its Pin # 0 and Pin # 1, as shown in below figure:
- In the Arduino Serial Read, we have seen that How to read data coming from serial port and we have used Pin # 0 for that purpose.
- So, now we are gonna write some data on the Serial Port.
- It’s like we are sending data from Arduino to some other device via Serial Port.
- For example, you are using GSM module with Arduino then you have to send AT commands to your GSM baord from Arduino and that’s where you use Arduino Serial write.
- You can download the Proteus Simulation and code for Arduino Serial Write Command by clicking the below button:
- Here’s the first syntax for Arduino Serial write:
- Arduino Serial Write is used to write some data on the Serial Port adn it send data in binary form.
- Here’s Arduino Serial Write Syntax:
- Now, let’s write some data on Arduino Serial Port using the above syntax and see what we got.
- So, design a Proteus Simulation as shown in below figure:
- Upload the below code in your Arduino software and get the Hex File from Arduino.
- In the above code, I have simply written a byte which you can see is 1.
- So, now upload it and run your simulation and if everything goes fine then you will get 1 on your virtual serial terminal of Proteus, as shown in below figure:
- You can see in the above figure that we got 1 in Serial Port so now you can send whatever you want via this Arduino Serial Write Command.
- Now let’s have a look at the second syntax of Arduino Serial Write command:
- We can also send a String of byte via Arduino Serial Write Command. Here’s the syntax:
- Now let’s sent a string of byte through this Arduino Serial Write Command, so I have used the below code and have sent our website address via Serial Write.
- So, use the below code and get your Hex File:
Python Serial Port Arduino Example
- Run your Proteus Simulation and you will get the below results:
- You can see in the above figure that we got the whole address via Serial Port.
That’s all for today, I hope you guys have enjoyed today’s post. In the coming post, I am gonna discuss the Arduino Print Command. Thanks for reading. Take care.
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https://www.theengineeringprojects.com/analogRead() and Serial Port Communications
Knowing if something is on or off can be extremely useful, but often you will want to know more. How bright is the light?
How fast is the satellite moving? These types of answers are often analog – they cover a large range of values, not just on or off.
The Arduino handles analog inputs with 6 dedicated pins, labeled A0 through A5. These pins have access to an analog-to-digital converter, which takes the range of input values and creates a digital version by cutting up the range into tiny pieces. All this is handled behind the scenes – all you have to do is use some very simple functions and you will get what you need.
You Will Need
- Potentiometer (any resistance range will work)
- Jumper Wires – at least 3
- Bicycle tire
Step-by-Step Instructions
- Place the potentiometer into your breadboard.
- Run a jumper wire from the 5-Volt pin of the Arduino to either one of the outside pins of your potentiometer.
- Run another jumper wire from one of the ground pins on your Arduino (labeled GND) to the other outside pin of the potentiometer.
- Run the final jumper wire from pin A0 on your Arduino to the middle pin of the potentiometer.
- Plug the Arduino into your computer.
- Open up the Arduino IDE.
- Open the sketch for this section.
- Click the Verify button on the top left side of the screen. It will turn orange and then back to blue once it has finished.
- Click the Upload button (next to the Verify button). It will turn orange and then back to blue once it has finished.
- On the menu bar, go to Tools > Serial Monitor – this will open the Serial Monitor window – you should see numbers rolling down this screen.
- Now adjust the knob of the potentiometer and watch the serial monitor window. The numbers should adjust between 0 and 1023.
This image composed with Fritzing.
The Arduino Code
Discuss the Sketch
This sketch starts with a multi-line comment describing the sketch and the circuit. You will probably notice that the first block of code is the setup() function – we do not declare or initialize any variables at the beginning of this sketch – instead we will do this inside the loop() function, as in the last example. Inside the curly braces of setup() we revisit the Serial library and use the function Serial.begin().
If you recall from the last lesson, Serial.begin() takes the baud rate as an argument (this will almost always be 9600). This function allows you to setup a communication channel between the computer and the Arduino. As you may know by now, setup() only runs once, and then we move on to the next block of code.
But wait! Don’t we have to set the mode of the pin we will be using? Great point!
What the Arduino does, by default, is set all the pins on the board as INPUTs unless you tell it otherwise. So in many cases, you do not have to explicitly set a pin as an input using the pinMode() function. That being said – I make it a habit to do this anyway – because it makes things clear to me – and that is worth it in space and effort.
So I dare you, set the mode of the pin using the pinMode(A0, INPUT) function inside the curly braces of setup()– you won’t regret it.
Moving on to the loop() function, we start with a variable declaration and initialization.
We declare a variable called sensorValue and we initialize it to the output of a new function. This new function is the glamorous analogRead(). So take a wild guess what this new function analogRead() does. It reads the value at the analog pin that you have chosen – in this case, it is the analog pin A0, where we have the center pin of the potentiometer connected. The voltage at pin A0 will be mapped to a number between 0 and 1023, and this value will be assigned to the variable sensorValue.
If you recall from above, the actual voltage at pin A0 will be between 0 and 5 volts, depending on where your potentiometer is adjusted – this value gets mapped to the range 0 – 1023 with the help of the analog-to-digital converter. So we have a variable that has recorded the value at our potentiometer – what next? Well, let’s look at the value. To do that, we need to print it from the Arduino to our computer – and you guessed it, we will use the Serial library function println() to do just that…
No big surprises here – we send as an argument the sensorValue variable to the function Serial.println() and our serial monitor window will display the resulting values.
To finish the sketch, we invoke the delay() function for one millisecond to make sure our next reading is a stable one and we start at the top of the loop() again. We record a new value using analogRead(), save it to the variable sensorValue and then print it to the computer.
Arduino Serial Port Example Free
All this is good and well, you might be thinking, but what does a potentiometer have to do with sensors? A potentiometer doesn’t sense anything! You are right – but interestingly, many sensors work by applying the same principle that a potentiometer does – adjusting resistance. Take a photo-resister for example – it can be used to sense light – because the resistance changes based on the brightness of light that it is exposed to – this change in resistance will adjust the amount of voltage that a pin on the receiving end will receive. So now the ball is in your court – what can you use analogRead() for?
Try On Your Own
- Change the analog pin to A2. Make adjustments in the code and the circuit.
- Try a different potentiometer in the circuit, does it affect the range of values displayed?