Questions tagged [softwareserial]

A library for emulating UART functionality in software on any available digital IO pins. Use this tag for questions regarding SoftwareSerial.

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No Information obtained when using 2 x SoftwareSerial ports on Arduino Nano

I have a LoRa Click Module and Adafruit Ultimate GPS which both use Serial Communication. I wish to just check the initial tests with all the components in on the Serial Console. Hence I have ...
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1answer
45 views

Referencing Serial output

I'm confused with what I'm reading. I have Serial communicating with my PC (USB) and SoftwareSerial over RS485 to a remote PC. I don't want to duplicate all of my print statements to be able to send ...
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2answers
3k views

myserial.available() returns zero byte

I wrote an Arduino program that requires two ports for serial communication. I intended to use both hardware serial and software serial, but the problem is receiving data from receiving buffer of the ...
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1answer
479 views

Serial monitor showing extra data

I am trying to communicate NODEMCU and Arduino Uno using Serial Communication (RX,TX) using SoftwareSerial library. Here is my code int count; char reqst[] = " "; void setup() { Serial.begin(...
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1answer
3k views

Reading from software serial with an interrupt

I want to perform a serial read using software serial with Arduino. I am looping for my normal tasks, but whenever something is received on the software serial pins I want to perform a read operation ...
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1answer
119 views

Read only selected Packet SoftwareSerial

I am reading data from RS485 which is in the following format: void sendkwh() { RS485Serial.write((byte)0x01); // Meter Address RS485Serial.write((byte)0x03); // Read Function Code RS485Serial....
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1answer
504 views

Serial 3 vs Software Serial

So I have a program that works great on the Mega, it uses serial 3 to read and streams out to the USB (I posted a previous question which someone answered) I tried to use Serial (D0) to read and then ...
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1answer
913 views

Interfacing to scale over RS-232

Objective: interface and Arduino MEGA to a Mettler Toledo SB32001 using the RS-232 communication protocol described in the manual. Equipment Used: SB32001 Mettler Toledo 32 kg scale Arduino MEGA ...
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2answers
815 views

How do I get the Itead 3G shield to work?

I've tried a pretty standard code but the Serial Monitor yields zero response. Using a standard Arduino Uno (tried a second one as well, just to be sure) and am now trying the second shield with this ...
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1answer
835 views

How to transmit more than 1 byte continually?

In software serial, the write function only sends 1 byte at a time. Is there someway, some library, that i can send multiple bits/bytes, without stopping (and not using digitalWrite)? i want to be ...
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2answers
556 views

Arduino Uno + Adafruit Ultimate GPS Shield Serial issue

I've had an Arduino Uno for a couple of months-making basic sketches-and recently purchased an Adafruit ultimate GPS shield and attached with soldered headers. This shield has 2 options for reading ...
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1answer
237 views

Unable to tell if error is from receiving or transmitting end

so I am having trouble sending data using software serial's write function. TX Code: #include <SoftwareSerial.h> SoftwareSerial TX(2,3); void setup() { // put your setup code here, to ...
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1answer
415 views

cannot read from softwareserial

I am able to use AT command from the Serial monitor however when I run the following code nothing is sent or received from the ESP8266. Can someone advise what could be the problem. #include <...
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2answers
206 views

What is the relationship between the gain on the receiver and the delay time

I was conducting some research on wireless communication between a simple transmitter and receiver module using an Arduino. Now, I tested the channel accuracy and i received 14% error for a delay of ...
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2answers
8k views

Communicating Via Serial1 on Arduino Mega

Apologies if this a relatively simple question, but I am rather new to Arduino's and cannot seem to find any concise information on the topic. This is my XBee, mounted on a shield and placed onto a ...
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1answer
30 views

Adafruit thermal printer prints weak

I am currently hooking up my arduino to an adafruit mini thermal printer. When a button is pressed, some code is executed which then sends some information to the thermal printer. Everything works ...
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1answer
63 views

How to create a USB CDC device. (I'm using stm32f103c8 black pill board) and I want to read the data through USB in my raspberry pi as a serial port

How to create a USB CDC device. (I'm using stm32f103c8 black pill board) and I want to read the data through USB in my raspberry pi as a serial port. I am using a black pill to read RFID-rf522 to ...
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2answers
67 views

Reading from 2 serial ports

I have 2 Arduino Nano, they are connected via ports 2 and A2 While I use only one port to receive, it works properly. But if I activate the second port, system crash (and even first port don't work ...
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1answer
59 views

Fixing serial communication , condition for serial data available checks out even after reading all the data sent

I have been working on monitoring an aquaculture , where I log the environment variables (temp. , humidity, gas sensor data) to firebase and control feeding mechanism via an app(where data can also be ...
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1answer
93 views

HC-12 modules stopped receiving, cannot understand why

I've created a simple transmitter with an HC-12 and an Arduino Nano (clone), where I send the values of DHT11 and LM35 sensors to a receiver unit made only of a Wemos D1 and another HC-12. Setup is ...
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1answer
47 views

Accessing softwareserial.available in the arduino loop function always return 0 but in the setup function returns the available byte [duplicate]

I am working on an accident detection system using arduino, what i want to do is to store the recipient phonenumber received as an SMS in the arduino EEPROM, using Serial1.available() to check for ...
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1answer
92 views

Serial doesn't initialise on Arduino Mega 2560 when not powered via the USB port

I am working on a project with a Mega 2560 and a Sim800L module. Everything works fine, however if i don't connect the USB port (at least once) and power only externally (either by Vin unregulated 7-...
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2answers
65 views

SoftwareSerial interfers with TVout

I'm using an Arduino uno and a Nodemcu for making a game with the phone as a WiFi controller. The Nodemcu is the server that receives inputs from the phone connected via WiFi and sends to the Arduino ...
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2answers
116 views

UART communication - Serial is always empty

I have a payment terminal which uses UART (or simply speaking Rx, Tx, Gnd pins) and I have an Android tablet app which is connected to the terminal using USB to DB9 adapter based on PL2303 chip. The ...
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1answer
449 views

Problem with powering ublox NEO-6M GPS module

Firstly, I'd like to mention that I'm a beginner. This is the first time I've worked with a GPS module. The serial monitor is completely empty when I upload the following code to my circuit: #...
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1answer
67 views

Buffer overflow error in ESP8266_SoftwareSerial library

I am running into buffer issues when running the Firmware.ino example here. The output from my Arduino serial log on baudrate 115200 (I put the ESP on baudrate 9600): Begin 01:17:15.538 -> ...
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1answer
345 views

From Strings to int problem

I create applications for a computer that is to be used to control the robot arm. I wanted to make the first attempt to run the application not on the motor, but on the diode and check if it will ...
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1answer
209 views

Why map Arduino pins 2 and 3 to Rx and Tx instead of using the build in Rx and Tx pins?

In many examples I see the following: #include <SoftwareSerial.h> const byte rxPin = 2; const byte txPin = 3; // set up a new serial object SoftwareSerial mySerial (rxPin, txPin); what is ...
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1answer
102 views

SIM800l doesn't respond on arduino micro

I want my Arduino Micro to interact with my SIM 800 L module. But unfortunately nothing happens, may you can help me figure out where I made a mistake. Here's my wiring: Summary of my wiring: ...
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1answer
112 views

How to use 2 serial port when WifiEsp library uses one of both

I try without success to receive datas from DataPort and transmit them to my computer via WifiPort, using ESP8266 wifi module. Each second, serial datas income on DataPort from another device. ...
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1answer
58 views

ESP-8266 stopped working due to possibly faulty perfboard layout

I have been following this tutorial to set up my ESP8266. I have also recreated on a perfboard the circuit provided in the tutorial, and I intend to use this perfboard circuit in my project. The ...
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1answer
225 views

Can't replace SoftwareSerial by Serial1 on Mega board

This sketch runs well with SoftwareSerial define and the monitor displays device modbus values. But now, i want to replace SoftwareSerial by Serial1 and i have no data. This is the sketch with ...
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1answer
311 views

mySerial.available() is returning 0

I am using bluetooth hc-05, arduino uno and ap app created by mit app inventor.The problem is myserial.available is returning 0 and hence its loop is not getting executed. I had connected four pins of ...
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3answers
1k views

I can send on software serial, but not read?

I've been cracking my head over this for a long while. Like many before me, I'm trying to send and receive data from a HM-10 bluetooth module, arduino mega adk and the app called BLE Scanner. I've ...
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1answer
190 views

Accessing one code using another code on RobotDyn Uno+WiFi board [closed]

Ok so I've been trying to do this for quite some time now. Still couldn't get it to work. I am trying to read a ESP8266 WiFi program from a normal Arduino Uno program. I've seen some people do this: #...
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1answer
625 views

Unexpected result with the GSM module A6

I have a GSM A6 module, like this one. I'm going to use an Arduino Nano as a bridge to communicate with it, I have an external power source (since I read that this module can consume up to 2A at its ...
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1answer
547 views

array to serial

i want to send an array of int to another arduino by serial. To garantie a better robust during the transmission, i added < and > with endMarker and startMarker. The receiver wait until the ...
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2answers
1k views

how to make GPRS/GSM SIM900 shield work with gps neo-6M module using Arduino UNO board

I'm a beginer to arduino program.i will like to make a program that will send latitude and longitude on my mysql database.so since 3 days i try to learn how to use all this material(GPRS/GSM SIM900 ...
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1answer
146 views

Is two modules using Serial Interface on one Arduino Uno possible?

I was wondering if I have both a Bluetooth HC-05 module and a GPS module (uBlox 7N) is it possible both for both to be using the serial interface? I'm aware they cant be operating simultaneously ...
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1answer
409 views

Serial communication between 2 arduino's doesn't works when Sending string in a program with a lot of functions

Note : This question is completely different from the questions that I have asked before although the code snippets might be the same, So please do not waive it as a duplicate right when you see ...
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1answer
1k views

when i compile this code it always 'sendCommand' was not declare in this scope..plzz help

#include <SoftwareSerial.h> #define DEBUG true SoftwareSerial esp8266(10, 11); // RX, TX void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); //for ...
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1answer
3k views

Connect Arduino to Socket IO Webserver via Esp8266

As part of a project I want to receive data on my arduino uno via a sensor, which is working fine. This data should be sent to a webserver where a node js with socket io is running. Therefore i bought ...
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1answer
10k views

Reading SMS using Arduino Uno and SIM800L and print on LCD (16x2 alphanumeric) using serial connection NEED HELP

Well, I am making a device, which has to receive SMS and print the text using am LCD display. Now I have code that can receive SMS and store it into a string variable using serial connection. Here is ...
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3answers
642 views

Make Arduino send and receive at the same time

I am working on a project where I connect a GPS module and GPRS SIM900 shield. The location will be sent when it recives a certain character. Now my question is, can the Arduino receive from GPRS and ...
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1answer
1k views

Arduino Servo with Serial

I have an interesting problem. I want to control ESC and servo with Arduino. I'm using HC-12 to communicate with 2 Arduino and I'm using SoftwareSerial on the nano. #include <SoftwareSerial.h> ...
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1answer
2k views

serial data transfer on gps shield duinopeak

I'm using an arduino uno r3 with a gps shield duinopeak. The shield is configured using RX pin 3 and Tx pin 2, as image below: I'm using the TinyGPSPlus library to read NMEA data. This is my code: /...
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2answers
2k views

NRF24L01 receiving even if no data sent

I am using nRF24L01 to communicate between two micro controllers. Both are Arduino Uno. The question i have here is , even if i do not send any data from sender to receiver , the receiver device is ...
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1answer
6k views

Hex String -> Byte Array -> Serial Write

I'm writing code that I discussed in a previous post. I now have a setup where I send my Arduino an ASCII-encoded Hex String that represents the bytes I want to write to my serial device. I think I've ...
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1answer
587 views

What difference between readString and while loop read

From Arduino code, I have a question for SoftwareSerial Class First: when I use more example for Esp8266 those functions use while loop to read response string from Esp when we send AT_Command to ...
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1answer
803 views

Unable to read and write serial data between two arduino's (hc-05 paired) when using a sensor

What I did was that I wrote a piece of code that will-in-fact move a servo motor when a clap is detected using a sound impact sensor (fc-04). The code for this is seen here and in fact does work: #...

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