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.

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How to filter out “jumpy” readings sent using Bluetooth

I'm using App Inventor to continuously send orientation values (as strings) to my Arduino, which are read using Serial.parseInt(). Using simple IF statements (if value > threshold), I'm trying to turn ...
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327 views

Program nodeMCU Over the Air (OTA)

I have a Lolin NodeMCU V3 with a broken USB port: no power, no data. It does show up on WIFI as AI-thinker_xxx, I can connect, but what can I do next? Is there a way to program the NodeMCU Over the ...
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1k views

Interfacing SD card with arduino without shield

I am trying to connect SD card with arduino without using a shield. To convert to 3.3v, I have used voltage divider circuit as described in these two sites: http://garagelab.com/profiles/blogs/...
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837 views

Hiduino as a Serial-USB midi coverter

I have an Arduino Mega2560 configured to Hiduino, which makes the Arduino a driverless class-compliant MIDI interface. I am currently converting RS232 serial I/O data to midi data using the 'hairless ...
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1answer
2k views

Reading three signals sent serially on Simulink from Arduino

I am sending three signals from one Arduino mega to another using xbees. On the receiving end I am using these signals in a Simulink code to control servo motors. Currently it is set up to read from ...
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2answers
3k views

Atmega328P-PU: Programmer is not responding

Few days ago, I built my own custom Arduino on the breadboard. It is built according to tutorial on http://www.crash-bang.com/resource/breadboard-arduino/. The Atmega328P-PU is already burned with the ...
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69 views

Arduino freezes if I do NOT do Serial.println() at least TWICE

Hii I have a big project, and found this when I tried to remove all the test code. To summarize: I have a variable that I use as a buffer for string operations called char internalbuffer[32] declared ...
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21 views

Initial setup print getting cut off from printing

I am writing a program in Python (using PySerial) that needs to read data from the Arduino quickly. For this reason I have set the serial timeout to 0.01 seconds. (Baud rate is 115k) If I don't set ...
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24 views

Problem displaying data sent from Arduino Mega to Arduino Mrk1000 using serial communications

I've been doing a personal project. The idea of the bigger project is to feed my fish using a robot. My specific problem is that I would like to see some data from the various sensors that I will be ...
2
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1answer
144 views

When it comes to UART to RS485 communication, what is the difference between the 'MAX485' and the 'HW-0519' module?

I recently found this model with the ID 'HW-0519' on it. It can be found online (HW-0519 in Aliexpress) and is sold for the purpose of converting UART to RS485 communication using Arduino devices. The ...
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60 views

SPI Arduino slave not recieving data correctly

Using an STM32L476RG Nucleo microcontroller board as the SPI master and an Arduino mega as a slave with pin 52 for SCLK, pin 53 for SS and pin 51 for MOSI on the Arduino. There is no issue with the ...
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1answer
154 views

Trouble obtaining values from Nextion screen to Arduino

Currently I have a setup running an Arduino BME 280 sensor and a 4.3" Nextion screen. What my program does is sent all the calculated values from the BME to numbers and progress bars in my ...
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29 views

What would be the best way to sniff an established serial connection?

I am studying a system running a serial connection and looking not to intercept its packets, but merely to inspect the traffic as it passes. Option 1 Hook the RX and TX wires to the RX of two serial ...
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489 views

Reading JSON from Arduino over serial in python and writing to a JSON file on computer

I'm fairly new to Arduino so I used a sample code before integrating this into my main code. I'm printing my value in a JSON format over serial. My Arduino outputs this and the python receives this ...
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100 views

Arduino SerialUSB.print/println is being interrupted by other prints

I have an Arduino M0 connected to a peripheral device. A PC is connected to the arduino via USB. The mode of operation is that the Arduino receives commands via USB that instruct it to do something ...
2
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1answer
103 views

RS-485 Serial communication problem with arduino

I use 485 modules to transmit data serially from one arduino uno to another uno. If I connect the 2 arduino boards directly without using the rs485 module, the data is sent and received without a ...
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0answers
70 views

Arduino EPROM dumper with utility program in C

I am writing EPROM dumper with Arduino UNO and utility program in C and I am using Ubuntu 20.04. The Arduino sketch works fine, but I am having few problems with the utility program. The first problem ...
2
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1answer
424 views

CIPSEND to ESP8266 returning bytes but no content

I am trying to send a GET request from an Arduino Uno connected to an ESP8266 through SoftwareSerial. I can't get it working directly in the code so I've stripped it down to a script that passes ...
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205 views

Serial Communication between arduino and nodeMCU

I am trying to connect a nodeMCU to arduino mega using serial communication so that i can read data from firebase. I have put the following code on the NODEMCU. #include<SoftwareSerial.h> //...
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172 views

Reading byte per byte from a txt file on SD Card without using the 512Bytes buffer

I am trying to read every sequenced-byte that is located on a txt file in the SD card. I have been reading quite a lot about the SPI and SD libraries, But I have found a lot of different information ...
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425 views

Connecting Audio Jack to Arduino

So I started working on a project of mine that is mostly software based which I have no problems with, but it includes electronics too. Where I am still learning a lot. Anyways, I have been trying to ...
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2k views

Reading +IPD response from serial.read() using Arduino UNO and ESP8266

I have a python server running on my PC and I am using an Arduino Uno (wifi enabled by a ESP8266 chip) as the client. I can make the the server and client communicate using AT commands as shown below: ...
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312 views

Adafruit Huzzah Feather not resetting and serial monitor garbage

Hi there, I have an Adafruit Huzzah Feather project laid out as you can see in the diagram above. Currently I am having trouble getting it to reliably reset and start the sketch. More often than ...
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2k views

No ttyACM0 nor ttyUSB0

I checked several related posts but couldn't solve my problem. I have Antergos Linux : # uname -a Linux biutitude 4.14.11-1-ARCH #1 SMP PREEMPT Wed Jan 3 07:02:42 UTC 2018 x86_64 GNU/Linux The ...
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664 views

ATtiny85 and MPU-6050 Gyroscope

I'm doing a project that involves sending MPU-6050 gyroscope data via serial communication to the laptop. Is ATtiny85 micro-controller suitable for this job? Is it powerful enough to do it? I was ...
2
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1answer
462 views

Arduino Pro Mini ATmega 328P: garbage output on serial console

Arduino Pro Mini ATmega 328P 3.3V 8MHz, connected to USB port via USB to Serial breakout board built around the FT232RL FTDI chip. JTAGenum project code uploaded to the Arduino. I opened terminal and ...
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109 views

Can't activate Seeeduino port

I want to use Seeeduino, but I can't activate port connection for it. To use Seeduino I installed Seeeduino from Board Manager in Arduino Studio. And then installed USB Serial Driver from this ...
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118 views

Serial.println cuts off first digit

I'm trying to perform a simple analogRead() and print out the result, as below: void getVoltMeter() { readValue = analogRead(A2); readByte = readValue/4; Serial.println(readValue); Serial....
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210 views

Garbage when listening to serial

This is the atmega328p code that is supposed to send a predefined message repeatedly. #include <avr/io.h> #include <util/delay.h> #define BAUD 9600 #define BAUD_PRESCALLER (((F_CPU / (...
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515 views

PS2 Keyboard and sending keystrokes between a Leonardo and several pro micros

I am working on a project where I am taking the the key presses from a PS/2 keyboard and passing them to several pro micro boards so I can type the same commands on multiple computers at the same time....
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958 views

Cant open serial monitor on linux

I have a pro micro and I'm running the IDE on linux. The IDE easily recognises that my board is on /dev/ttyACM0 so i can flash programs on to it. I am testing the following code void setup() { ...
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825 views

Make RFID Tag as a variable

I want to make RFID Tag as a variable, and push it to the web server. But I struggle to do the Serial.read function. Any solutions? Here is my code #include <ESP8266WiFi.h> #include <SPI....
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494 views

Send .wav file from SD card to NodeMCU via serial port

I was able to send a text file in the SD card to NodeMCU using the serial port of an Arduino Mega using this code: if (readSerial1 == "Okay I'm ready") { myFile = sdf.open("uid.txt", FILE_READ); ...
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235 views

MATLAB and Arduino communication

I have to send from MATLAB to Arduino a char line 'S' to start the Arduino program and send back values from a sensor. This is my MATLAB code clear; delete(instrfind); s = serial('/dev/cu....
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4k views

Run Servo when detect object on OpenCV Python

I want to connect OpenCV (Python) with arduino Uno when it detects a tennis ball. OpenCV code: import numpy as np import cv2 import serial face_cascade = cv2.CascadeClassifier('tennisballdetect.xml')...
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150 views

How can I use delimiter/split serial input in a loop function?

How can I use delimiter/split serial input in a loop function? I want to use each word from the input and check a database, to check availability. #include SoftwareSerial.h> #define ...
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562 views

Arduino Serial Communication Issue

I state that I have already written a similar question on StackOverflow thinking that the problem is with my computer software. Anyway, after some shell debugs, I notice that the real issue is on the ...
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58 views

Serial Write fails to send when Motors moving

I have an unusual bug with the code I have written for my rover V2 robot. I have a raspberry pi running some computer vision code written in opencv tracking an object doing the heavy processing. ...
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0answers
589 views

Xbee S2 API Data Packets dropping out

I made a setup which consists of 3 Zigbee's, 2 routers(Zigbee S2C's) and 1 coordinator(Zigbee S2). The routers are each connected to arduino nano which collects data from 2 FSR's and an IMU(frame type:...
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436 views

I can't receive data from Arduino through Bluetooth

I am developing an app that controls an Arduino robot. For that I need to communicate through Bluetooth. That means sending and receiving data. Why receiving? Because I also have sensors on the robot. ...
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0answers
437 views

Working on Binary code with arduino

i have a BGM113 bluetooth module that sends messages as binary form. I have to work on each bit separately. i am not sure about Serial.read() gets it as binary but when i am trying to see at on the ...
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625 views

Yet another “Mac cannot find USB serial port” post

I have read about every post about people having issues with their Arduinos on Macs. I have a 100% authentic Arduino UNO, that I cannot by any circumstance manage to connect to my late 2009 iMac with ...
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0answers
56 views

Erratic behavior from 'randomly' generated values in array

Currently working on a data collection algorithm on the Arduino MEGA (ATMega1280) and I've run into a problem with some of the code I've written. I feel my problems may be stemming from the way in ...
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0answers
57 views

I want to modify setup, to also keep the serial USB port opens so I can send strings via a Raspberry Pi

I am trying to modify the original code from these guys GRA & AFCH, who have made an Arduino Sketch Program that runs a Arduino powered Nixie Clock. Here is the link to their Firmware file:...
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43 views

Why is my radio circuit working with other arduinos but not the Pro Minis?

I have some Arduino Pro Minis. I have both the 3.3V/8MHz and 5V/16MHz versions. I'm trying to get them to work with the nRF24L01 RF modules. I've lightly modified some example code from the RF24 ...
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0answers
2k views

save bytes from Serial into ROM (EEPROM)

I am trying to save an incoming text from serial into the ROM of the Arduino using EEPROM. I found out that you can only save a byte at once. So I thought I could do it like that: #include <EEPROM....
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3k views

Reading Serial Data Using readBytes() and Use of Serial.read()

I'm trying to mix Serial.read() and Serial.readBytes() when reading over one of the Serial ports on my Arduino Due. I thought that using Serial.read() would clear what is on the serial, and then ...
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576 views

ArduinoDue - Matlab: SerialUSB.write() sends ASCII?

I'm trying to get some binary data from an Arduino Due to Matlab. Basically this is the setup: Due: byte usbMsg[33]= {0}; // filled with dummy as example usbMsg[1] = '00000001';// in[3]; usbMsg[2] ...
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0answers
626 views

Transforming from analog output to speed and acceleration with gy-61

Maybe it's a simple question but I'm unable to get what I need. My task is this: Get the acceleration and speed of each axis of the accelerometer. I thought of something like: const int VCCPin = ...
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299 views

SIM900 module not responding on hardware COM port

I've got my sim900 module working with arduino by using their software serial library, however, I want to eliminate arduino from the equation and have serial communication directly to sim900 module. ...

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