Questions tagged [serial]
Serial communication is the standard USB connection between the Arduino and a computer with a standard USB A to B cable or through the TX/RX pins using a USB to serial converter. It can also refer to the serial library.
2,132
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Program blue pill with with Arduino IDE? [closed]
I ordered some bare chips STM32F103C8T6 from AliExpress, which I soldered to a custom PCB with a reflow oven. But the problem is, my program uploaded, but it did not run.
To confirm that it is not the ...
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2
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Clear serial data for new incoming values
I'm trying to extract numbers from a string sent via serial and then convert the numbers to integer values which I can use for arithmetic operations or toggle an Led. But the problem is I have to send ...
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1
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Reading serial data from Arduino in Python continually
Using a stepper motor and a range finder (TFLuna), I am trying to build a "Lidar" (like a Radar, but with light). Here is the algorithm:
Turn motor one step, calculate angle, measure ...
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1
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Compilation error: 'Serial' does not name a type [closed]
#include <IRremote.h>
IRrecv IR (11);
Serial.begin(9600);
void setup() {
// put your setup code here, to run once:
IR.enableIRIn();
}
void loop() {
// put your main code here, to run ...
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Arduino not reacting sometimes when reading serial commands
When I am sending hex numbers via computer to the arduino leonardo, it sometimes won't react, but the serial monitor says that it was sent. My code;
void setup()
{
Serial.begin(9600);
pinMode(...
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0
answers
37
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Python program can read but not write on serial monitor
I'm trying to write a small python program to communicate with my Arduino board but, somehow, I'm having a little trouble.
My goal is to switch on and off a LED by interacting with the desktop program ...
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1
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69
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ESP32 cannot serial monitor [closed]
I use esp32 devkit v1 .
I code follwing this picture.
const int vavle = 1;
int d = 1;
void setup()
{
Serial.begin(115200);
delay(2000);
while (!Serial);
Serial.println();
pinMode(vavle,...
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0
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118
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ESP32 S3 Same code works on Serial1 but NOT on Serial0 for RS485 module
I have designed a test board to understand ESP32-S3 working pins. I am using USB interface D+, D- for programing so Serial0 is free to use.
This is my test circuit for testing an RS485 converter. For ...
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0
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482
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esptool.py error Cannot configure port, something went wrong. PermissionError(13, 'A device attached to the system is not functioning.', None, 31)
When trying to upload my firmware to an ESP8266 board using Arduino IDE 2.2.1 I get
A fatal esptool.py error occurred: Cannot configure port, something went wrong. Original message: PermissionError(13,...
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1
answer
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RF24 if statements are not reading properly, even if an "if" value is wrong, it still follows the associated code [closed]
My code is taking values from a remote and transmitting the state of it. Right now the states are just 1 and 0, on or off, and is writing over the serial monitor on the transmitting Arduino. On the ...
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2
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39
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Serial Buffer stays empty as soon as it becomes empty once
I have a question regarding serial buffer readout.
At program start, I send a serial command to a sensor that 1. activates him and 2. let him send data - that works.
When I unplug the sensor, the ...
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1
answer
74
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Python script cannot connect to serial port
I want to control the LEDs with my hand, for this I used the repository https://github.com/paveldat/finger_counter/tree/main. I want to control the LEDs with my hand, for this I used the repository. ...
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Arduino to Arduino communication
When I send data to an Arduino Uno via the serial monitor, the serial data goes down the same USB cable used to program the Arduino. So there must be a device on the Arduino board like a FTDI or USB-...
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1
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Wolfram Mathematica reads but closes stream feeds from Arduino Serial port after a few data sets
This is a Wolfram Mathematica / Arduino serial feed problem , but I am posting here just in for any suggestions on enhancing the Arduino code or the Mathematica notebook. The original post is here ...
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1
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115
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convert string representing a binary number to binary
I have a serial input "1111111" and I would like to convert this to a binary B1111111 that I can send to a led matrix.
I tried to search, but, all the results were misleading, led to full ...
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116
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Arduino Uno RFID-RC522 won't scan any card or tag
So I bought a RFID-RC522 module with a blue tag and a white card, and I searched for tutorials and found this library that I used it.
and here is my code :
#include <MFRC522.h>
#include <SPI....
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1
answer
59
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Read byte and time into EEPROM, then display with a comma between the time and the value?
I have bytes of natural numbers 1-60 coming in at random times:
Example of send data
// Uno send
void setup() {
Serial.begin(9600);
int integersToSend[] = {1, 22, 30, 4, 50};
for (int i = 0; ...
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1
answer
43
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Reading a string from the serial port and comparing to another string
I'm using an Arduino Mega 2560 and writing a really simple piece of code that doesn't work.
String a, letra;
#define led 13
void setup() {
Serial.begin(9600); // opens serial port, sets data rate ...
1
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1
answer
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ArduinoJson reading `null` from Serial
I have a setup that reads from serial when I sense that there is something to be read (and always assume that what is sent to the arduino is valid json):
void setup(){
Serial.begin(9600);
...
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1
answer
52
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Serial does not read buffer with integer characters greater than 43
I'm trying to write a script to move an object coupled to a linear axis through a stepper motor. The user must send information such as the length to be moved, the speed of movement, the direction of ...
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1
answer
75
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Lilypad sends corrupted data on Serial
I have an Arduino Lilypad with this simple code where I try to write a simple message to the serial console. The baud rate is set to 9600 both in the code as well as in the serial console and I'm ...
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1
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59
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Make my Arduino (Mega or whatever is better for the task) to be able to read and write `Serial` data to a **rj45** port
I have a Chinese hybrid solar inverter that exposes an rj45 input which talks the serial protocol (Baud rate 2400, no parity, 8 bits, 1 stop bit). I need my Arduino (say, Mega or whatever, does not ...
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0
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Why are the UART ports not working on my Portenta breakout Board?
I am using a Portenta Arduino Breakout Board (https://store.arduino.cc/products/arduino-portenta-breakout) that is connected to the Portenta H7 (https://store.arduino.cc/products/portenta-h7) for a ...
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63
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I have a cash counter with RS232 in the back of it, I want to read the data that supposed displayed on the projector
I have cash counter with RS232 in the back of it. I want to read the data that supposed displayed on the projector with RS232 to TTL convertor and arduino.
Here is all my setup
Now I
Connect the ...
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0
answers
56
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Arduino MKRZero "This device cannot start" (Code 10), and Keyboard.h
I have bought my brand new Arduino MKRZero to emulate a keyboard. When I plug it in, I get the following on COM6, which is listed as "Arduino MKRZero".
"This device cannot start" (...
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1
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How to fix UnicodeDecodeError when using Serial.println
I am using an Arduino Uno R3 to send instructions to a serial monitor in a Python program with Serial.println. But when I send a specific line, I get a a UnicodeDecodeError.
The line in the Arduino ...
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Slow I2C communication
To collect temperature and BPM, I connected a max30101 in my Heltec WiFi kit V3 with ESP32. The data collected are stored in arrays to extract statistical features from signals which an algorithm will ...
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1
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Why this simple serial monitor code not working?
The follwoing code echoes whatever arduino recieves through reciever pin. The idea is that arduino will echo whole data in the buffer on the same line and starting from the new line while echoing the ...
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1
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ESP8266 serial monitor spitting out garbage
I am trying to set up a weather station, and I should just have the anemometer left. This code works fine (as far as I know).
// Pin definitions
const int reedSwitchPin = 2;
// Variables
volatile ...
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sim800l gsm module response isn't completed
I am using the sim800l gsm module with nodemcu esp8266 and comunicating with it using AT+ commands. The module is working correctly but I am trying to use the command AT+CLCC to get all the current ...
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1
answer
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HardwareSerial and SoftwareSerial not compatible
The HardwareSerial requires to run an interrupt to store received bytes in the buffer. Look at this file from the Arduino Core.
If I am now constantly receiving and writing on the Software Serial, the ...
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1
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SoftwareSerial and HardwareSerial lost data
I need two Serial ports. One port is some sort of modified Software Serial, where I have to be listening constantly and send responses immediately if the port requires it. There is no XY problem ...
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1
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Arduino Uno WiFi Rev2 is sending serial data to IDE, but not to C# program
I have an Arduino Uno WiFi Rev2 which I am trying to read data over the serial port from (using C#). The Arduino program periodically emits data to the serial port (for testing purposes). Whenever the ...
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1
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147
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Why is the serial monitor not printing a variable?
I connected an Adafruit color sensor to my Arduino and am having it make calculations. However, when the calculations are done and sent to the serial monitor, it says "NDVI: " without ...
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3
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1
answer
135
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How to ignore garbage values in serial communication between arduino and python
I have arduino uno. I am trying to send and receive serial data from arduino to python. I have usb to uart converter. I have connected its tx to rx of Arduino and rx to tx of Arduino and gnd is ...
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3
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680
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Best way to send a boolean (1/0) to a windows application in real time?
I have an arduino mega connected to a light sensor that reads the status of a machine's indicator light. I have a C++ application that controls the machine, and I would like the arduino to send the ...
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votes
1
answer
250
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Unable to upload sketch to Lolin S3 Pro (ESP32-S3)
I'm trying to upload a simple sketch to the new Wemos Lolin S3 Pro but unfortunately I can't seem to get it to work. I get the following error message:
Connecting......................................
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0
answers
44
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Can I use regular pins (Example: D2, A3, etc...) as serial (RX, TX)?
Python/Arduino Beginner here...
I have a DFplayer I am trying to hook to my Arduino and I want to hook it up through the regular pins instead of the RX and TX pins, but I've not been able to find ...
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2
answers
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Arduino unable to read 0x41 and 0x42 (reads others just fine (ICT bill acceptor)
Here is my issue:
My code successfully recognizes and accepts $1 (0x40) and $20 bills (0x43), but it fails to recognize, display, process, anything for the $5 bill (0x41), and $10 bills (0x42). Also, ...
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0
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51
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nano 33 BLE problems with reading RC signal
I'm using an Arduino Nano 33 BLE and a L293D motor driver to control a three-wheeled RC robot. The sketch I'm using worked fine with my Uno Rev3, but I've moved to the Nano for size/weight reasons, ...
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1
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Serial plotting a pwm
I'm trying to plot the value of the pwm that increases (every 2 sec) then decreases to compare it to the value of an encoder. I was expecting a continued value (like a step ) during 2 seconds but ...
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2
answers
64
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converting comma delimited Serial message to 7 Unsigned Long variables
Working on a project where I get an input where its a comma delimited string like:
"255,10000000,42949672950254,12,22".
and then the numbers (no commas), would be split into 6 Long ...
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1
answer
193
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How to produce a USB CDC serial port for Arduino nano 33 BLE?
I'm trying to program an Arduino Nano 33 BLE bare-metal to get some precise timing and size measurements. I've managed to upload the code to my card, but I cannot communicate with it. More ...
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vote
0
answers
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slave arduino receiving commands from two serials
I have a slave arduino connected to a master arduino mega (through UART) and to a RPi (through USB). The slave arduino is set to monitor various SHT85 (through I2C) and NTC sensors. What I would like ...
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1
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Maduino (Arduino Zero) at91samd21g18 - Unable to connect to the serial port
I have been using this device very little but it was use to work, and it also gave me the same issue in the past, the somewhat I was able to upload again.
I tried to use the reset button, and short ...
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0
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Serial does not receive all chars
I'm trying to follow Serial Input Basics to build a program which receives commands over serial like "<led:12,34,21>" but i'm stuck on receiving the characters from serial...
I have ...
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0
answers
140
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OEM Arduino UNO not seen by COM port
Arduino UNO R3
My error code:
avrdude: ser_open(): can't set com-state for "\.\COM3"
An error occurred while uploading the sketch
This has been mentioned several times before here in the ...
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2
answers
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Program to Multiply Numbers Won't Actually Multiply Them
I am trying to write a program which takes in a number of pairs to be multiplied, then prints out the result of each multiplication. Instead of doing this, the program just prints out the number of ...
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1
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51
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I need some help in transmitting voice via VLC
The project I'm working on: Short-Range Coded Visible Light communication System.
Visible Light Communication (VLC) systems utilize light to transfer data between transmitter and receiver over short-...
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1
vote
1
answer
145
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Arduino Mega Loopback Test with Several TX/RX Ports
I am trying to do a loopback test using an Arduino Mega. What I am looking to do is send a byte over TX and receive said byte back at RX and verify that the byte is unchanged. More or less I just have ...
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