The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3.0 License. Find anything that can be improved? Suggest corrections and new documentation via GitHub. Arduino MEGA 2560 and Due. Both the MEGA 2560 and Due have 4 serial ports in total. One that connects through a USB port chip to the USB device port on the board and three extra serial ports that connect to pins on one of the pin headers of the board. Serial.print output will appere in the monitor window, click the rightmost icon on the window bar of the arduino window. You can't get the arduino to write in that other place. This part of the Arduino programming course shows how to get data into an Arduino sketch from the serial port. Data can be sent to the Arduino from the Serial Monitor window in the Arduino IDE. A user can enter data in the input field in the serial monitor window to send values and data to the Arduino.
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Description
Used for communication between the Arduino board and a computer or other devices. All Arduino boards have at least one serial port (also known as a UART or USART), and some have several.
On Uno, Nano, Mini, and Mega, pins 0 and 1 are used for communication with the computer. Connecting anything to these pins can interfere with that communication, including causing failed uploads to the board.
You can use the Arduino environment’s built-in serial monitor to communicate with an Arduino board. Click the serial monitor button in the toolbar and select the same baud rate used in the call to
begin() .
Serial communication on pins TX/RX uses TTL logic levels (5V or 3.3V depending on the board). Don’t connect these pins directly to an RS232 serial port; they operate at +/- 12V and can damage your Arduino board.
To use these extra serial ports to communicate with your personal computer, you will need an additional USB-to-serial adaptor, as they are not connected to the Mega’s USB-to-serial adaptor. To use them to communicate with an external TTL serial device, connect the TX pin to your device’s RX pin, the RX to your device’s TX pin, and the ground of your Mega to your device’s ground.
Active2 years, 4 months ago
I've hooked up a ADH8066 (Sparkfun) GSM Module to my Arduino Uno, and am trying to get some correct serial going between the Arduino and the GSM module. It works fine when I connect to it directly (via USB or just the TTL lines) but not when being controlled via the Arduino. Some text will output correctly, the rest will be garbled, almost as if the baud rate is wrong, but I'm just using the same baud (115200) I do as when I connect from a PC.
Here is the Arduino code I'm using:
Below is what I'm seeing in the serial monitor:
CRUSADER
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mabnzmabnz
7 Answers
SoftwareSerial is notoriously picky about timing and will cause problems like you describe when 'too much' is going on at the same time. It probably gets out of sync because of you are doing other stuff on the side.
I warmly recommend AltSoftSerial (http://www.pjrc.com/teensy/td_libs_AltSoftSerial.html), which performs much better, but I still suggest you use slightly lower baud rates to increase reliability. Too high baud rates will require very exact timing to not miss a single bit and the hardware is not powerful enough to do serial traffic in software without problems.
kriskukrisku
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Make sure the 'baud' setting matches your sketch.
Ex: Serial.begin(115200); >>>> 115200 baud in the console.
I got this solution out of a comment above from kunalbhat. But I wanted to post it as a stand-alone answer because it solved my problem, and it would have never occurred to me. So I think it will help a lot of other people.
Brett CBrett C
As was said before, the issue is with the 'baud' setting (which has to do with serial communication- another answer). This can be found (typically) at the top of your sketch, and might look like this:
Or this:
In the case of an Arduino Uno, a 'baud' setting other than 9600 will result in garbled text. As such, make sure that at the beginning of your sketch, you have the line:
Feel free to ask if you need any further help.
Nicholas UlizioNicholas Ulizio
The reason is that, you need to set the command AT+UART_DEF=9600,8,1,0,0 to reset the baud of ESP to 9600, or you can also use AT+CIOBAUD=9600!
Try it, it's working for me! I have tried AT+IPR on some ESP-01 and ESP-12 modules, some times it's working and sometimes no(and in really bad case, the baud change completely)!
Sanix darkerSanix darker
I was using the Arduino to program a ATtiny84 but was getting garbled output or serial was stopping after the 1st line until I reset the Arduino.
The issue was the Arduino had the 'Arduino as ISP' sketch loaded which was interfering with the serial data coming in from the ATtiny84.
Uploading a blank sketch to Arduino fixed it.
Chris GunawardenaChris Gunawardena
villy393villy393
i had to go back to hardware serial on my mega to get it to work. never had good luck with sw serial
hardware serial sim900 to mega: //middle rx/tx pins on sim900 to pin tx1/rx1 on mega
Arduino Serial Output Clear
lagunacomputerlagunacomputer
Arduino Serial Output Buffer SizeNot the answer you're looking for? Browse other questions tagged serial-portarduino or ask your own question.Comments are closed.
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