Questions tagged [communication]

for questions about communication between multiple devices.

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I2C Devices Interference

I am currently trying to connect 3 I2C Devices to an Arduino Mega, as detailed in the fritzing sketch. The Sensors are: Max86150 PPG Sensor on a breakout board (5v), MLX90614 IR Temperature Sensor (3....
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1answer
23 views

Arduino with bmp280 sensor not entering void loop

I've been working on a project in which I need to know my altitude. For this purpose I've been using the BMP280 sensor. But I have an issue. I've been trying to test if the sensor works with the ...
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0answers
39 views

Windows Driver for Arduino error code 22

I'm trying to use avrdude to load an Arduino program with the console, but I have a Windows 7 x86 Professional with Service Pack 1 (old PC). When I install the Arduino driver that comes with the IDE ...
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2answers
5k views

DFRobot GPS init error [Arduino Uno, SIM808]

i have problem with initialization DFRobot SIM808 actually when i try to recieve gps data by SoftwareSerial only it does works (i mean examples based on sending and reading command to and from serial'...
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1answer
1k views

How do I use I2C from an Arduino Uno when I have a GSM shield mounted?

This may be an extremely obvious question but I don't seem able to find a definitive answer. I have an Arduino Uno and a Sim900 GPRS/GSM shield fitted on top of it. I had I2C working on the Arduino ...
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0answers
38 views

How to use an Arduino to upload a program to another Arduino without an intermediate computer, SD card or custom programmer board?

I have seen several other questions here which appear similar to this but the solutions offered don't quite match the issue I am dealing with. Problem: I am developing a portable battery-powered ...
0
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1answer
111 views

HID communication between Arduino Uno and computer

I used some firmware I found online to turn the UNO into an emulated HID device. The Arduino is no longer connected to a Serial COM port so I can't send serial data from my computer to the device. Is ...
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1answer
40 views

Transmitting multiple values to the arduino, and Interpreting them with minimum delay

I am building an underwater robot, which can move Up/Down, Forward/Reverse, controlled by a Joystick. The situation is like this : USB Joystick is connected to a PC, PC is connected to an Arduino via ...
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2answers
41 views

Can RX pin(s) be used as TX instead?

Title question. I do not need any receive communication pins, only transmission. Actually, I need as many transmission pins as possible on any Arduino besides a Mega2560 (to re/write the EEPROM of ...
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1answer
156 views

half duplex for Atmel SAMD21

I'm using Arduino MKR GSM 1400. I know this board uses Atmel SAMD21 and SAMD21 support half duplex (USART with full-duplex and single-wire half-duplex configuration). My question is, How Can I ...
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0answers
34 views

WiFiNINA communication via SPI on the Nano 33 IoT

I am trying to understand how the WiFiNINA Lib is working on the Nano 33 IoT device. On the mentioned board the SAMD21G is connected to the ublox wifi module via SPI and I am studying how they ...
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1answer
31 views

SIM7000E Waveshare can't do anything

Can someone help me? I'm using a sim7000e from Waveshare. One week ago it was working normally, but now it doesn't work at all; it even can't read the RX-TX communication. #include <SoftwareSerial....
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2answers
252 views

Using HC-08 bluetooth module with arduino

I have an arduino mega 2560 and a recently purchased HC-08 module and the connection is as the following: Arduino | HC-08 VCC - VCC GND - GND 14TX3 - TXD 15TX3 - RXD When I power up the arduino it ...
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1answer
38 views

How to fix “expected primary-expression before '%' token” error code? [closed]

I'm trying to use this code to get temperature and humidity values from DHT11 sensor and send it to Python and I need to write the temperature and humidity values in the same line. But I keep getting ...
2
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1answer
148 views

Is there possible implement websocket using AT Command?

For example I have a sim800l module to communicate to a server using websocket (socket.io) but that module allows AT Command to operate. I have successfully made an HTTP request, but I don't know how ...
2
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0answers
36 views

Real range of long range transceptor LORA RA-02 SX1278 with Arduino UNO

I'm working in a project where I have to send data from long distances (about 1 km) between 2 Arduinos UNO which are powered by computer's USB ports. The place is a small city with no large buildings. ...
1
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1answer
25 views

Serial communication between nodemcu and Arduino Uno

For the last days, I am trying to establish serial communication between nodemcu and Arduino Uno but I failed to do this. Currently, I am working on a Home Automation project. I receive data from ...
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2answers
2k views

nRF24L01+ packet loss caused by Arduino reading and communicating with sensors

I have 2 Arduinos communicating with each other. My problem is that one sends packets every 1.5-2 seconds but the other Arduino does sensor reading and data uploading with a Wifi module, which may ...
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1answer
42 views

SD seems too slow for SMTP

I have asked this question on the arduino forum as well. I have used SMTP before using client.print (and client.println) but I am now trying to move as much text as I can from RAM to SD (and so I need ...
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1answer
123 views

Sending 4 analog values from one arduino to another with I2C

I have modded a cheap drone controller to output its joystick values to an Arduino Nano. I made it to output its 4 pot values using I2C to another Arduino don't ask why. So my problem is that I need ...
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0answers
35 views

Extremely bad analog read on ESP32 while using 433MHz module

I'm currently trying to transmit data from one ESP32 to another with 433MHz modules. I also need to read some sensor readings from an Hall sensor. When the ESP32 that sends is not connected the values ...
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0answers
20 views

Communicate/Configure with Pro Micro (using Joystick.h) from within Windows

I'm creating some Joystick-like controllers to augment simulator games. I usually use the Joystick library from MHieronimus which has worked great so far. Now, I'm using some non-momentary rocking ...
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1answer
922 views

How to communicate with GPS SIM900a without Serial Monitor

I am fairly new to Arduino. I was working on a project where I use a GSM SIM900a modem interfaced with an Arduino. The AT commands are sent via the Arduino to the GSM Modem. The problem, however, is ...
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2answers
3k views

Multichannel communication with Arduino and HC-12 transmitter

The HC-12 module has 100 possible channels starting at 433 MHz. Can someone tell me how to program the Arduino to use multiple channels at the same time? My goal is to build an RC transmitter with ...
2
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2answers
73 views

Arduino Yun receives UDP packets but prints them with gibberish

Arduino Yun is set to receive UDP packets. It receives those data with some gibberish. How is all set up: Arduino Yun (acts as a server) is connected through Ethernet to a PC which is (through WiFi) ...
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2answers
376 views

Share I2C pins with other device when lacking GPIOs

We're Using ESP12E as our MCU and we have three functionality : SIM800 connected to TX(GPIO1), RX(GPIO3) Matrix Keypad connected to GPIOs: 14,13,2,10,0,4,5,16 GLCD connected to GPIOs: 15,12 And we ...
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1answer
192 views

How to display CAN BUS information on EPS32 web server?

I try to display the transmitted information from CAN bus on ESP32 web server. I saved the CAN.read() in a buffer receivedChars[i] and try to display the data by client.println(receivedChars[i]);}. ...
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2answers
292 views

nRF24L01 - leaves out end characters during transmission

This is my Master's code. #include <nRF24L01.h> #include <RF24.h> #include <RF24_config.h> #include <SPI.h> RF24 radio(7, 8); const byte address[6] = "00001"; char text[20] =...
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0answers
29 views

Arduino serial issue

My arduino mega should be communicating with another card (ANET8) and also with a DC resistance meter (with python code) using 2 serial ports, one using the USB(resistance meter) and the other one ...
2
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2answers
202 views

Sending minimal data between two Arduinos far away from each other

Problem: I need to send small integer numbers (single-digit numbers suffices) between two arduinos located approximately 50-60m away from each other. The connection must be made through cables. I have ...
1
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1answer
46 views

Arduino Comms disrupted, prevents program loading (catch 22)

I have written some software which, when loaded onto an Arduino Micro, blocks communications for some reason. Lets stipulate that there is something wrong with it. Using the Ardiono IDE on Windows 10,...
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0answers
71 views

What’s the most stable digital communication protocol for sewable electronics?

I’ve spent the past few days trying researching communication protocols and I have a few issues. With sewable electronics, you need to work with cables with a fairly high resistance that are ...
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1answer
46 views

Communicate from Arudino to computer over 3.5mm port

I'm wondering if it would be somehow possibly to have easy communication with a computer for Arduinos that don't have USB like the pro mini. That would make an easy way of having two-way communication ...
2
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1answer
46 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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2answers
142 views

Communication between 2 arduino boards

I am not really 100% too sure how to do this but I am trying to make my arduino UNO communicate with my arduino MEGA. The reason why I needed to do this was because I was using the RFID module along ...
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0answers
22 views

Make Arduino Nano 33 IOT talk to another Arduino via Bluetooth

I have an Arduino Nano 33 IOT and I want it to talk to another Arduino that has an HC-05 Bluetooth module. Is this possible? I cannot find anything on the internet that talks about doing this.
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1answer
199 views

Flow control between ESP32 and RS323 device

I'm trying to communicate an RS232 device with an ESP32 (Heltec Wifi/LoRa 32 v2) my problem is that I don't receive any response from the device, doing some research, I'm thinking that the trouble can ...
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0answers
25 views

Communication b/w Arduinos, master(M) and slave(S) via Tx Rx pins. M sends query to S which shows the data in serialmonitor. S fails to send data to M

Slave code int arr[10] = {0,1,2,11,4,5,6,7,8,9}; char id = '1'; char re[2]; void setup() { // Begin the Serial at 9600 Baud Serial.begin(9600); } int ia; void loop() { Serial.readBytes(re,2);// slave ...
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2answers
13k views

Arduino master/slave communication using RS485

I am using Arduino Uno as a Master Device and 3 Arduino Unos as slave devices. I am sending data from each slave to master after every 3 seconds continuously, and is going to execute further logic ...
0
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1answer
32 views

I want to make two arduino to communicate over different wifi. Is that possible?

I want to make any 2 Arduino module from different places to communicate over wifi. I really need to know if it possible? If yes, advice me more about it. I want send data from sensor module from one ...
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2answers
102 views

Read Internal Registers of RS485

I am trying to interface sele EM2M, I am using Arduino Mega with RS 485 module. I want to read the internal registers I am using ModbusMaster library. The data which I want to receive is in the ...
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3answers
125 views

Using several Arduinos simultaneously

I'm working on a project where I need to control the light of 5 buttons as well as listen when each button is switched on/off by the user. I would furthermore like to provide feedback on an OLED ...
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0answers
29 views

Arduino communication

I want to message and call arduino board. I want some type of automation. But where should I get started I don't know I've tried sim900a module which was disappointing experience for me. Then I found ...
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2answers
31 views

Can I use The mpu6050 with this?

I am making a project with 3 arduinos (2 slave, 1 master) and I want to know can I use the mpu6050 since it uses the I2c communication.
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0answers
31 views

Send message to multiple number

sim.println("AT+CMGS=\"+91xxxxxxxxxx\"\r"); I don't want to write this. I want to write mobile number on serial monitor in Arduino and on that number, i want to send message. how ...
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0answers
25 views

Arduino Due SerialUSB Resetting

Having this basic example for using the SerialUSB function on the Arduino Due under Windows: // ARDUINO DUE BLINK LED void setup(){ pinMode(13,OUTPUT); SerialUSB.begin(2000000); while(!SerialUSB)...
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1answer
103 views

How can I display text on OLED?

I'm trying to print the information, which is received from the other ESP32 by CAN transceiver, on an OLED. The CAN bus is working perfectly, as the 'HELLO WORLD' is already be received. But I can't ...
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1answer
55 views

Simple ModBus Master function 15

I have a simple setup with arduino Nano as slave and a arduino Mega as master Can anyone explain how the function 15 FORCE_MULTIPLE_COILS Works i have been running some test on this and cant figure ...
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2answers
2k views

Arduino reads hc-05 device connecting status

Hello I want to get an arduino get status of bluetooth hc 05 if connect with device or not . I'm trying by myself and search on internet website but I can't find useful things.
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1answer
45 views

My two slave SPI setup on arduino not working correctly

I am trying to connect a DPS310 and an ADXL345 to my Arduino using 4 wire SPI. When the individually tested (i.e. each has its own script), the output is correct, however when the scripts are combined ...

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