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Arduino boards such as the Uno, MEGA2560 and Due all have a serial port that connects to the USB device port on the board. This port allows sketches to be loaded to the board using a USB cable. Code in a sketch can use the same USB / serial port to communicate with the PC by using the Arduino IDE Serial Monitor window, or a Processing application for example.
The USB port appears as a virtual COM port on the PC. This article shows how to use Arduino serial ports when additional serial ports are needed for a project.
Arduino Serial Ports Available The serial port for programming the Arduino mentioned above is a hardware serial port. The microcontroller on the Arduino board has a hardware serial port built-in, so that after the port has been initialized by software, a byte sent to the port will be sent out serially by the hardware. The Arduino Uno has only one hardware serial port because the microcontroller used on the Uno has only one built-in serial port. The Arduino MEGA 2560 and Arduino Due both have 3 extra hardware serial ports. Serial Port Technical Details The hardware serial ports referred to here are UART (Universal Asynchronous Receiver Transmitter) ports.
They may be referred to as USART (Universal Synchronous Asynchronous Receiver Transmitter) ports in the microcontroller documentation if they are configurable in both synchronous and asynchronous modes. Arduino Uno Serial Port This image shows the only serial port available on the Arduino Uno highlighted in red.
The port connects through a USB chip to the USB device port.
Post Views: 144,550 Foreward Hello everyone. Today I want to write a short tutorial in response to a request that we received yesterday on the Meccanismo Complesso site by pensodisi. I hope that will be useful both to him and to all others who have similar needs. Any request or suggestion will always be an incentive for us to improve. Introduction For those who delight in carrying out projects with Arduino, sooner or later they will have to deal with the exchange of values between the Arduino and the PC to which it is connected. If you use Arduino connected to a sensor (see Fig.1), Arduino produce a series of data that may be sent to a computer to be stored in a file, displayed or processed in some way. If you use the Arduino connected to an actuator (see Fig.2), such as a stepper motor, most likely, the computer will send a series of data to the Arduino.
The latter will process the received data by converting suitably into commands to send to the motor to make it move in the amount of necessary steps. Fig.3: A servo motor Instead, in an upcoming article, I will collect data from a sensor connected to the Arduino and sending these values to a PC.
Regarding the various commands to drive the servo motor or other motor types (DC or stepper motors) I suggest you refer to the article. Drive a servo motor with a sequence of angles in a file I chose a servo motor due to its simplicity, especially with regard to the controls. In this tutorial, the servo motor will assume the angles in a list within a TXT or CSV, moving sequentially in time, reading line by line. Fig.5: This is the tutorial scenario As you can see, you will activate a serial connection between the Arduino board and the PC.
On the Arduino board you will implement a sketch that will take care of “to listen” for any value (angle) sent from the PC. From the PC side, instead, you will activate a serial session in a Python shell (but it can be replaced by any program in Python) that will read the contents of the file (CSV or TXT) by sending appropriate signals via serial to the Arduino. I chose the servo motor as an actuator also because it can be connected directly to the Arduino without the use of appropriate control boards. Refer to Figure 6 for the connections.
Each value sent from the PC is read character by character and inserted into the strValue array. If the character read will be a number (0 to 9) then it is stored in the array, if it will be a non-numeric character (in this case the comma ‘,’) the reading will be stopped and the value inside the array is converted to a numeric value through the atoi function.
The numerical value so obtained is stored in the newAngle variable, and represents a new angle at which it must set the servo motor. This value to be acceptable must be between 0 and 180 degrees. This will then be compared with the current angle angle, and depending on whether major or minor, we will increase or decrease gradually (degree by degree) the angle of the servo motor. This is to avoid sudden jumps by the servo motor. The angle at which the engine must be set is defined by the write function of the Servo library.
Write ( '110,' ) you will get a result identical to that obtained previously with the Serial Monitor. The servo motor will rotate until it assumed the position corresponding angle of 110 °. But the purpose of this tutorial is to read a sequence of values listed in a CSV file. C reate a CSV file with a sequence of angles and save it as samples.csv. Copy the file you just created in the working directory of the Python Shell. If you do not remember or do not know what it is, enter the following commands.
Thank you for this great tutorial, I am willing to send from python to arduino “only” one no. For now representing no. To turn the dc motor on and count the rotation encoder steps,the arduino code is working fine when I write in serial window also form python IDE but when reading from csv file not! My code is from your suggestion with no error and printing on python shell the no. I want import serial import time import os os.getcwd ser = serial.Serial(‘com3’,9600) file = open(‘C: Python27 robosampl.csv’,’rb’) while 1: line = file.readline if not line: break print(line) ser.write(line) time.sleep(3) knowing that the csv file was text file and I changed its extension to csv.