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Questions tagged [serial]

is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus. Traditionally "serial" relates to a three (or more with hardware handshaking) wire system (TIA-232-F), now using ∓25V Voltages. Technically speaking the specialized SPI (Serial Peripheral Interface) and I2C (Inter-Integrated Circuit) buses are serial communication systems as well - use one of those tags if they would be more appropriate!

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93 views

C# “/dev/ttyGS0” throws error “Invalid Argument”

I'm working on an application for my pi in C# code. The overall idea is to create a usb "pc status" monitor that I can put inside my PC case. My code that runs on the pi uses a ini file for settings. ...
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1answer
120 views

How can I make a VT420 terminal on a CH341-based USB-to-serial dongle work?

Situation: I'd like to use my age-old VT420 console on my Pi 3B. As the UART is already occupied, I plugged a USB-to-serial dongle with CH341 chip (lsusb told me that) into one of the USB ports on the ...
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1answer
2k 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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0answers
156 views

RPI serial input from RS232 via MAX232 to Node-Red [closed]

I use Node-Red to monitor serial RS232 data from a home automation box. All works fine for a couple of weeks and then the data is no longer seen. I have to reset the RPI to recover from this. I have ...
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1answer
275 views

send data from a virtual serial port to a tcp server

I want to send data from my PI (that doesn't have a serial port) to a serial device. now for this I understadn I need to create a virtual port on the pi and send the data from it in windows I use ...
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1answer
445 views

pymodbus on Raspberry Pi 3B and Energy Meter

Followed this thread on enabling the serial console on the Raspberry Pi 3B. Checked the functionality using this code: dmesg | grep tty Which produced these results: ... console [tty1] enabled ......
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1answer
280 views

pigpio library serial_wave confusion

I am trying to use joan's pigpio for python to try to write a command from a rpi3 GPIO pin to a peripheral device. the peripheral device uses UART and when it receives a data packet it will then ...
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3answers
5k views

Serial to USB, no ttyUSB0

I'm trying to open a Serial communication between a Raspberry Pi 3 (model B, running on Raspbian) and a device (a traffic counter to be precise). I've a USB to Serial cable, using the rs232 standard. ...
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0answers
276 views

pigpio python serial wave output not correct

I am trying to use joan's pigpio to write a serial command on my Rpi 3 gpio 14(UART0TX).My goal is to write a command from the pi to another device. When i send the command i do not see the ...
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1answer
108 views

Weird output on python IDE terminal

I am trying to get my Pi 3 communicated with arduino but am getting output which i can't understand. My arduino code: char dataString[50] = {0}; int a =0; void setup() { Serial.begin(9600); ...
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2answers
614 views

Raspberry Pi - Connect and power RS485 device

I am trying to connect a Raspberry Pi to a OSDP card reader. The reader communicates via RS485, and is powered by 9-27V DC. Unfortunately, I have not been able to succeed with a serial connection in ...
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1answer
545 views

How to connect GSM module to Raspberry PI3 and also using Bluetooth of Raspberry PI3

I want to use Bluetooth of Raspberry Pi3 and also I want to Connect GSM module sim800l to Raspberry Pi3 ,in this instruction Bluetooth will be disable , what is the the best way to use both of them? ...
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1answer
2k views

UART RX stops reading data after working correctly

I'm trying to read an continuous stream of data from my device (laser altimeter). The device is connected to the UART Rx pin of raspberry Pi 3B+. Everything works fine with this python code: import ...
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1answer
91 views

Why Raspbian jessie version 8 won't allow communication through GPIO serial pins?

I am running Raspbian Jessie 8 on Raspberry 3 and I followed the answer to the question Why my program won't communicate through ttyAMA0 on Raspbian(jessie)? But I still can't get my program to ...
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1answer
158 views

Multiple TTL sensors on serial RX GPIO 10

Is it possible to read more than one TTL sensor on serial RX GPIO 10? I know you can add multiple serial sensors on /dev/ttyUSBx Does the same apply to /dev/ttyAMAx ?
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1answer
322 views

Mono can't see serial port

I followed the instructions here to disable Bluetooth so that /dev/ttyAMA0 is available, which it is. I wrote a small Python script to open /dev/ttyAMA0 and send some random data, and I could receive ...
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1answer
72 views

Multiple raspberry pi GPS interfacing

I have a raspberry pi stack (containing 4 raspberry pis). I have a single GPS with serial and I2C output. I want the supply the GPS information to all the 4 raspberry pis simultaneously. Is it ...
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0answers
225 views

rfcomm service not working for Bluetooth over serial

I'm trying to connect with a terminal to my Raspberry Pi over Bluetooth, however with my current configuration (which is what I have found in numerous places online) when any device pairs and connects ...
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2answers
109 views

Writing to GPS HAT on Raspberry Pi Zero W Never Returns Anything

I have attached a GPS HAT to a Raspberry Pi Zero W running RASPBIAN STRETCH WITH DESKTOP. When I SSH in to run a simple Python script that writes to the HAT serial port, nothing happens and I am not ...
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2answers
192 views

Interfacing Arduino with Raspberry Pi [closed]

Can we interface Arduino with Raspberry Pi? I need to interface 16 pressure sensors with Arduino. And get the reading through to Raspberry Pi using serial port communication. Is that possible?
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0answers
236 views

Setting up a serial connection via bluetooth

I have a GSM HAT module which I am trying to use as a remote sms receiver, which my RPI will connect to using bluetooth. The problem I am facing is setting up a serial connection via bluetooth. Out ...
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1answer
540 views

Connect multiple SPI e-paper devices to a single Pi

So I'm thinking of getting these 2.9" displays: https://www.waveshare.com/wiki/2.9inch_e-Paper_Module#Working_with_Raspberry_Pi they come with an SPI interface that can be connected to the Pi. Is it ...
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0answers
38 views

USB Dongle not working if it's connected by default to my Raspberry Pi

I have a USB Dongle That I communicate with it using UART commands. So if I connect my dongle after starting the system I can send commands and I'm able to receive info, But if I leave the dongle ...
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1answer
499 views

Using Serial to Read Ultrasonic Sensor?

I have an HRLV-EZ4 ultrasonic sensor hooked up to my RPi 3 B+ like so: Serial output --> pi RX (pin 10) V+ --> pi 5V GND --> pi GND I've already gotten it to work with an analog voltage output and ...
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0answers
72 views

Raspberry Pi and Arduino echo over USB

I am trying to create an "echo server" with Arduino UNO, so that user could send some message to it through Raspberry Pi and receive the same response. On Pi I am using Python and PySerial library to ...
0
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1answer
204 views

HC-08 - RPI 3 - Can read but can't write

I use a Raspberry Pi 3 Model B and I have a Bluetooth HC-08 module. I would like to be able to send and receive data. I use the port /dev/ttyS0 and I changed the file /boot/config.txt for "...
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0answers
2k views

change baud rate of serial port raspberry pi 3 android

I installed lineage os 14 on raspberry pi 3 I connected a gps module with UART port, however, the baud rate of GPS is 9600 but baud rate of /dev/ttyS0 is 115200 I want to change the baud rate of ttyS0 ...
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1answer
73 views

Passing data from output of a function to be used in a function python

I have a few parts of a weather station together and am running into an issue with functions. the humair fuction returns two values hum and airtemp. The problem is when the sendpost function runs it ...
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1answer
34 views

Is serial output via USB an option to make a rs232 connection to a pi?

There is a lot to find online to make a serial port with the gio 14 and 15 pins on the pi, isnt a usb to serial converter on a usb port of the pi a good option ? I ask this because i want to use the ...
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3answers
492 views

Error on changing permissions in serial port

I have been trying to find a solution for 2 days but I wasn't able to find one. I want to change the permission of the /dev/ttyAMA0 but seems to be impossible. I tried with sudo chmod 777 /deb/ttyAMA0 ...
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1answer
285 views

No parity bit in Serial communication using PL011 uart

I have little experience on UART communication. I am using the PL011 UART instead of mini mart in a Raspberry Pi 3, therefore I should have parity bit. The thing is when I enable the parity bit in my ...
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2answers
193 views

Memory leak using node-serialport library on pi zero w

Ok, I'm scratching my head here. I am playing with the node-serialport library and when I run this script, the memory is eaten up at a rate of 2MB per second: var SerialPort = require('serialport'); ...
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0answers
25 views

How to stop yellow and grey boxes on serial console during boot?

I have a Raspberry Pi Zero W running Raspian Stretch. When it boots, it prints grey and yellow square characters to the serial console before displaying "Last login ..." and the login prompt. I ...
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2answers
256 views

Debricking WNR2000v3 with Raspberry PI and a serial connection?

I don't actually need to debrick this WNR2000v3, I'm just trying to learn how to connect to an embedded device using a serial connection to see if I can do it. I believe I have setup the wires so ...
0
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1answer
368 views

Rubbish Values (b'\x00\x00\x00 … ') - UART of Arduino to RPi 3B

I am getting b'\x00\x00\x00 ... ' together with the data I want. For example, my Arduino is writing 'hello raspberry' to RPi. At the RPi, it receives 'b'\x00\x00\x00 ... hello raspberry\r\n '. Why? ...
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1answer
34 views

Can you get / store readings from a RadioShack 22-812 Digital Multimeter with a raspberry pi serial interaface?

I was looking at an article on debricking an OpenWRT router using it's serial interface by hooking it up to a Raspberry PI when I realized that my old RadioShack 22-812 Digital Multimeter also has a ...
0
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1answer
246 views

mqtt on rpi zero w

I have rpi zero w system with below spec. system specifications: micro SD card slot, a mini HDMI port, two micro USB ports (one for power, one for USB), and 512MB of RAM. It has a single-core 700 MHz ...
0
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1answer
231 views

Serial connection with raspberry pi to arduino, works only once and needs a hard reset every time

so I am working on a project where I have to connect an arduino to the raspberry pi through serial and then transfer the input from the raspi to another I2C device. So, just to test things out and ...
3
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2answers
573 views

How to send bytes to dmx using python

I have a headlight connected to my rpi with dmx cable and a RS422 / RS485 Serial HAT shield (https://www.hwhardsoft.de/english/projects/rs485-shield/). According to the instructions it should be using ...
1
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1answer
453 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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3answers
3k views

Arduino-Raspberry Pi fast data communication through serial

I am trying to sample from two analog sensors at highest frequency possible (using and Arduino Uno, MPC3002 ADC), then send the data to raspberry pi to save them as binary file. Arduino and MCP3002 ...
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1answer
703 views

Raspberry Pi Zero W - connect Micro USB to FTDI to arduino board

I'm using this FTDI on a Raspberry Pi 3 Model B to connect an arduino board via USB. can I do the same thing on a Raspberry Pi Zero W using this USB OTG Micro USB to Mini USB to connect the FTDI to ...
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0answers
158 views

python 2.7 vs pyserial - no _port

I really have tried searching through all the forums. confusing. The makers of Roboclaw wrote their test pythons scripts (and Roboclaw class) with Python 2.7. As of now, will NOT work with python v3. ...
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2answers
1k views

Raspberry pi 3 reading serial port

I have a python code that reads the serial port of the raspberry pi 3to obtain GPS positions from a fona808. The code works for some time and then throws this error. Traceback (most recent call last):...
1
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1answer
89 views

Can I use the USB connector to transfer plaintext data (via serial console / socket) to a linux PC?

I have a script on my pi that currently simply outputs some numbers from a sensor to the console, several times a second. I am using this for a demonstration, and need a way to reliably (not over the ...
0
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2answers
140 views

Can't get serial port working (header pins, Raspberry Pi 1 Model B)

I have read quite a lot of tutorials and tips about the issue, but serial port just doesn't work. There has to be some configuration that I have missed. The setup Raspberry Pi 1 Model B (oldest ...
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0answers
416 views

Connect multiple sensors on a single USB to RS485 adapter

On tindie I bought a RS485 soil moisture sensor with a USB to RS485 dongle. I want to add more sensors for monotorring multiple plants. Since RS485 is a bus system, it seems basically possible to ...
2
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1answer
711 views

Blank terminal in Pi0 UART connection

Following this tutorial exactly: https://learn.adafruit.com/adafruits-raspberry-pi-lesson-5-using-a-console-cable/overview i.e.: Drivers are installed UART line is added and enabled I get a blank ...
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0answers
1k views

Can't Login to Pi0 console from Pi3 B+ via UART Serial USB-TTY Adapter

I am new to RPi's so bear with me please: I am trying to log in to the Pi0 console via sudo screen /dev/ttyUSB0 115200 but I just get a blank screen. Ouput of dmesg | grep tty: [ 0.000000] ...
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2answers
332 views

Connecting sim-card module to Serial Pins

I am trying to connect a sim-card (GSM) module to my RPi. I've connected its serial pins, to the serial pins on the Pi. I then edited the /boot/config.txt file by adding enable_uart=1 to the end. ...