Raspberry Pi

Questions tagged [communication]

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Regarding communication between a Raspberry Pi and another device. Communication that is not specific to any particular medium.

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RS485 Interface on Raspberry Pi is not initialized

I have a working RS485 shield mounted on my Raspberry Pi device. And I use it successfully for modbus rtu communication. So I am pretty sure that my raspberry device and RS485 interface is ok. I tried ...
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1answer
31 views

How to get an app to talk to a Raspberry Pi without the Pi being initially connected a network

I've been working on a project where I need an app I made to be able to get scripts to run on my Raspberry Pi. The problem is I need it to work so that if anyone had the app and my pre-configured Pi ...
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1answer
75 views

Connecting Pi to an old analog phone

I want to connect an analog telephone set with Raspi which will house a telephone directory. Using telephone set's digits (alphabets) any user shall interact with GUI on Raspi to search for a number. ...
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1answer
103 views

What's the best solution to detect the coming of a person [closed]

I have a robot which should detect an approaching person and identify them in a range of about 1-3 meters. For that, the person should have something on their key ring, ideally without battery life ...
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41 views

Multiple RPIs to 1 PC communication with CAN BUS

I have to establish multiple RPI(Let's say 2-3) to 1 PC communication. I have to set up a CAN bus in either the PC or RPI. I am considering using an Ethernet cable and setting up a python server on ...
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1answer
65 views

How to get two raspberry pi's to talk over internet

I have an idea for a special project, but in order for it to work I need two raspberry pi's to talk to each other over the internet, not wifi. I use python3 as my programming language, and I want one ...
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1answer
253 views

Sending data to blynk with python to control widget LED

Greetings fellow programmers! Yesterday I asked a question on how to install blynk for python3, and thanks to some generous help I got it to install itself. However, now I need to know how to control ...
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2answers
182 views

Communication between 2 raspberry pi's

I am trying to communicate between 2 raspberry pi's (3B and 3B+), through Gpio's (not uart, just as input output). So I am making a gpio on one Pi as Input and on the other Pi as output. So can I ...
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80 views

Tektronix Oscilloscope under PyVISA on a RaspberryPi 3B +

I am working in a project that requires to control and automatize to devices, a Function generator HAMEG HMF2550 and a Tektronix TDS2024C, which are connected via USB to the RaspberryPi (I will ...
2
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1answer
156 views

How to turn off RX and TX pins

I have a Raspberry Pi 4 with Buster and on top of it a 4G HAT. This HAT allows communicating via RX and TX pins. I want to communicate with this HAT via RX and TX pins but with an Arduino Nano. It ...
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1answer
88 views

How can Rpi communicate with Arduino in RF (Radio Frequency), Say Using nRFL2401+?

I need to transmit and receive data between Rpi and Arduino, in RF (Radio Frequency). I must say I have next to zero experience in this field. So any help, papers, documentation, book or manual would ...
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1answer
296 views

SMS Gateway project using ZTE MF920V 4G MiFi modem

For a personal project, I'd like to use an MF920V modem. It's a mobile 4G modem made by ZTE. (Not to be confused with USB dongles). The idea is to code an api with Python or Nodejs to remote control ...
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35 views

Wireless Protocol to use in a Forest

I am planning to make a robotic tank for monitoring a large wilderness area like a forest. I need some form of radio communication with which I can control the tank from anywhere in the world. What ...
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48 views

Bridge between Twilio API/phone line and closed circuit 20v intercom

Question about how to achieve the below using a Raspberry PI. What hardware would i need to buy and is the below possible? I have a closed circuit intercom system in my house. This is a video ...
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31 views

(Wired or wireless:) Synchronise two RaspberryPi units over 300m to within 1/48000 s

I need to synchronise two RaspberryPi units over 300m to within 1/48000 s. I would like to investigate both wired and wireless solutions. Suppose I run 2 wire between them: - pinX_on_unitA <--> ...
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0answers
65 views

Communication between computer with Labview and Raspberry Pi

I would like to use a computer with Labview to send commands to a Raspberry Pi, for the moment I am just trying to get a LED to blink. What would be the best way to proceed ? I have thought of two ...
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0answers
165 views

Pulse Position Modulation on Raspberry Pi Zero

I want to WRITE a Pulse Position Modulation (PPM) to an arduino from a raspberrypi. Is the board capable to do this and if so, from which port/pin? A pulse position modulation is a signal that ...
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27 views

New to Pi I need to connect a device via serial communication, how do I teach myself?

I've been asked to connect and control a finger-sensing device to a Raspberry PI. There is a protocol to respect called OSDP. It supposes a serial connection on top of RS485. I'm a seasoned C/C++ ...
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2answers
136 views

Local network between 2 RPIs over GPIO

I’m planning a project where a RPI zero will be controlling a flying vehicle. It’s going to have 2 (maybe 3) cameras as an input. These will be connected over USB. I’m aware that processing the ...
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1answer
310 views

When socket programming on raspberry pi, getting ConnectionRefusedError

I am working on a simple project where I need two raspberry pi's communicating each other with an ethernet cable. I connect one end of ethernet cable to let's say first pi and the other end to second ...
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1answer
1k views

Rpi3B+ buster USB to Serial (/dev/ttyUSB0) Communication Problem

I'm trying to establish a serial communication between my Raspberry PI 3 B+ - running on Raspbian 10 Buster - and a testing machine I have. The normal behavior of the machine is to send test related ...
2
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1answer
155 views

USB serial communication between Raspberry Pi 3 and Roboteq motor controller [closed]

I am new to Raspberry Pi and it's communication. I need to make a project where I want to use a Raspberry pi 3 as a monitoring device for motors and battery system. The Raspberry pi itself ...
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1answer
290 views

Control Raspberry Pi from long distances not using WiFi

I want to control my Raspberry Pi from a long distance not using WiFi and be able to send my data to it and receive data from it distance could be like 12 kilometres for more than it and and if ...
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166 views

RPI GSM Add-on SIM800 AT commands are not working

I am trying to send sms using RPI Add on v22 module and Raspberry-pi 3+. I have mounted this module on top of Raspberry-pi. When I use minicome using minicom -D /dev/ttyS0 -b 115200 -o I get the ...
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2answers
328 views

Communication between rpi and microcontroller [closed]

I need to program communication between raspberry pi 3 and microcontroller. I'm wondering what type of communication is the Best. I2C, UART or SPI?
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94 views

Communicate between two Raspberry Pis using USB-Ethernet cable

I have two raspberry pis I want to communicate between. For convenience, let's say one is always the talker and the other is always the listener. The listener's ethernet port is occupied by another ...
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92 views

PiCAN2 network is down

I am using RPi 3 model B+. I am trying to set up can communication using Pi CAN2 (From SKpang) with baud rate 500000. But I am getting "write: Network is down" whenever I am sending "./cansend can0 ...
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216 views

reading EMG on Rpi3 using Teensy 3.2 on usb serial

We are using MyoWare EMG sensor and reading the RAW EMG pin as well as filtered SIG pin on the board. What it basically does is sends an analog value as a fraction of the input Voltage, which in this ...
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1answer
102 views

Peculiar features of I2C communication between RPi and Arduino

I am currently trying to establish two-way communications between an Arduino Leonardo and a Pi model B using the I2C bus, as slave and master respectively. Spookily, the Pi can successfully send ...
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71 views

Should I buy a pi zero with my Pi 4 4GB

I am buying a raspberry pi 4B with 4GB of ram and I was wondering what the connectivity between raspberry pi 4 and Pi Zero is like? Do they communicate well? and what software do you suggest? Is ...
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2answers
4k views

How to send and read a string from Raspberry pi to Arduino via serial interface?

I was trying to send and receive data between Raspberry pi and Arduino UNO. I'm able to send and receive a string from Arduino to Pi using Serial.println. I spent hours searching a better tutorial or ...
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2answers
36 views

Communicate with computers on external networks

I'm trying to build an application with my RPi 3B that get some data from connected sensors. Once I got the data, I'd like to send them to a computer that is on an external network via a script in ...
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1answer
55 views

LoRaWAN connection between three Raspberry Pi 3s

Are LoRaWAN devices able to transmit compressed/zipped JSON files which are 5-10 Kb big? Furthermore I've been reading up the LoRaWAN technology to get a better understanding. I would like to have 3 ...
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1answer
324 views

Serial communication error

Could someone help me to fix this error while trying to connect RPi 3 B+ to an inverter in order to read data via CH340G usb module, Below the used code : from pymodbus.client.sync import ...
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1answer
329 views

Modbus communication

I try to read data from a device by raspberry 3 B+. those two devices are connected via CH340G usb module (USB to Serial (TTL) adapter). Concerning the python code; here's: from pymodbus.client....
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54 views

CAN bus read on RPI3

I have 10 CAN IDs on the bus and would like to read all the 10 IDs every 0.1 seconds. I was able to write the code below but it shows me one message only. import can bus = can.interface.Bus ("can0", ...
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42 views

How do I make my RPi talk to my PC over an Ethernet Cable?

My PC is running Windows 10. I'm working on establishing communications from my RPi to my PC via an ethernet cable. I've set up static IP addresses for both the PC and RPi on their respective ethernet ...
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2answers
277 views

capture Image with picam then send to another pi via UART

I would like to send an image(JPEG) captured by a pi-zero (in a in-closed container) to an pi3 for storage and analysis. Currently I have UART via gpio set up, but so far I have only been able to send ...
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257 views

Read data from a balance via RS232 port using rs232 to usb converter cable in rapsberry pi

I am a beginner to this, I have a balance (scale) that I need to read the data (weights of material) from. Data will be read every 10 seconds and I have looked up RS232 codes in here and utilised ...
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0answers
32 views

raspberry in the middle

I have a pc that can communicate to broader intranet, but it now must also connect to LINUX server that is its own network via RJ45 ( wired LAN ). The Raspberry could communicate to the special ...
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1answer
56 views

p2p - Send data from Windows Computer to RPI [closed]

I want to be able to send a small amount of data quickly directly from a windows machine to a Raspberry Pi 3 B+. My restrictions include: Preferably not having any sort of wired connection between ...
0
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1answer
4k views

Could not open port /dev/ttyS0: Errno 13: Permission denied: '/dev/ttyS0'

I am getting this error whenever I am trying to run this code: import serial from time import sleep ser = serial.Serial ("/dev/ttyS0", 9600) #Open port with baud rate while True: ...
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1answer
83 views

Long distance wired communication between 2 raspberry pi [closed]

I need to send video feed from one raspberry Pi to another raspberry Pi for 10 meter . Can I use Ethernet cable ? what do i need to do?
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19 views

How to communicate with my raspberry pi without using ssh or http? [duplicate]

I have a raspberry pi at home that I want to control from the "outside" world (e.g. my office). The thing is that my home router is not visible to the outside world; it's within some kind of a "subnet"...
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1answer
60 views

Using Raspberry in Nanosatellite [closed]

I want to use raspberry pi in space projects like cubesats. I worry about effects of space radiation on raspberry.Is this possible to do?or i need to choose another board or something like that?
2
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1answer
76 views

fork() Process Issue on Channel Switching via Rotary Encoder

I have KY040 rotary switcher(encoder) as shown below picture. It is the scenario that there are 5 radio stations(simple html url) in urls.txt which are read into stations list in radyoCS.py, at every ...
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1answer
172 views

I am trying to create a HID that controls the up and down arrow keys with the raspberry pi

I am trying to create a HID that controls the up and down arrow keys with the raspberry pi. I don't know the simplest/best way to connect the pi to pc for live data exchange. My idea is that the pi ...
1
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1answer
667 views

Serial communication using GPIO Pins for more than 2 raspberries

I'm doing a project at work which involves multiple (more than 2!) raspberry pies (Model 3 B+) being able to talk to each other (talk to each other means being able to send data of the size of a ...
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0answers
204 views

Raspberry Pi Lifi Proof of Concept Help

I'm currently an Electronic Engineering student. I'm coming to my third year and I can build a project of my choosing to write my dissertation about. I have decided to do it on Lifi. I would really ...
2
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0answers
3k views

Raspberry Pi and LIN Bus

I want to implement a LIN Bus using a Raspberry Pi 3. The RPi will be the master controlling slaves on the LIN Bus. My idea is to use the Raspberry Pi UART, but I am not sure to what extent this ...

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