Tagged Questions

is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus.

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0answers
97 views

Connecting to an RC522 RFID reader

I'm trying to connect an RC522 RFID reader to the a Raspi via its serial ports. Up till now, I have tried several different pieces of code that are supposedly working, however, I have had no success ...
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0answers
38 views

RPI ERROR: Unable to open NFC device

I am currently following this guide: https://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi/testing-it-out After completing all the steps - inputting into the console: $ cd examples/ $ sudo ...
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1answer
37 views

TTL serial connection weirdness

I've been trying to connect my Pi to my Mac using a USB-TTL cable. I followed this tutorial. On the terminal I get nothing when the Pi connects (not even sure if it connects at all). I've tried ...
1
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1answer
74 views

How can a USB Bluetooth Dongle be used as login TTY

I would like to be able to use a Bluetooth Dongle - not the HC06 module, but a simple USB dongle (the pretty generic kind, or even poundshop type) as a serial login console/tty. I have already tried ...
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1answer
98 views

Python serial permission issue

I'm trying to connect my Arduino to my RPi through python and PySerial, and I'm using the following code: import serial ser = serial.Serial('/dev/serial/ttyACM0', 9600) and I was getting an issue ...
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3answers
238 views

Connecting B+ to Serial Port

I have a recording device with a 9 pin dsub connector for control. Pin 1 == Ground Pin 2 == TxD Pin 3 == RxD Pin 5 == S. Ground 4&6-9 == NC I'd like to use the 40pin header on a raspberry pi B+ ...
0
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1answer
122 views

SIM900 to Raspberry

I've recently bought SIM900 with this module. Connected it to Raspberry Pi - GND, 5V, RX-TX, TX-RX. I'm using following code to test it (found on web): #! /usr/bin/env python import argparse from ...
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1answer
51 views

Permanent serial connection to Raspi

I can connect an arduino by serial to my laptop no problem using Processing. Is a Raspberry Pi likely to be able to maintain a permanent USB serial connection to the arduino, or am I likely to ...
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1answer
39 views

Serial string not being read consistantly

If I send the following string to the rpi echo "#q10" > /dev/ttyUSB0 Why does the whole string not get read each time its sent? This is the app output The code is as follows. I am using ...
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0answers
84 views

getting the rasberry pi to controll a tm1802 led strip

Hi i recently purchased a tricolor led strip from radio shack and while they are made for the arduino I am very sure they will work with the raspberry pi. They take in serial data (24 bytes) and use ...
0
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1answer
22 views

How to detect specific string over serial using c

I am connecting my raspberry pi to a device using the serial port to record data coming from the device at 19.2k. Currently I am using a usb to serial adapter, but this could change in future. The ...
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0answers
28 views

Slice of Radio and Ithobox

I've got a Raspberry Pi with Ciseco Slice of Radio and I'd like to control my Ithobox LINK It has an 868 Mhz RF transmitter/receiver and I also have the optional RF remote control unit which I'll be ...
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0answers
37 views

Not sure if serial connection is working

I have been trying to get this working for a couple of days now, and nothing I've read seems to fix it. I am working on trying to communicate with the pi via a serial connection. My current setup is ...
0
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1answer
100 views

Choosing an OLED / LCD Dispaly

I'm building a simple device where my Raspberry Pi talks to Google Calendar, and displays information about where I'm at on my office door. My code is all in Python It was simple until I started ...
2
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1answer
227 views

Arduino Serial Port via Raspberry Pi SSH

I have just bought an Arduino Uno R3 and I would like to view the Serial Monitor using my Raspberry Pi via SSH. I have looked around on forum sites but cannot seem to find the proper software or ...
1
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1answer
185 views

RaspberryPi to Arduino(leonardo) avoiding latency

I'm using a Python script via (TKinter)on the raspberryPi to capture mouse movement and events. My goal is to send this data, in real time, to another connected Arduino device(Leonardo). My first ...
0
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1answer
90 views

Need to initialize serial connection with screen

My Problem: I've got an Arduino connected to my Pi via /dev/ttyUSB0 and I always have to initialize the connection via screen, otherwise I cannot send any values via Bash or Python. What I'm doing: ...
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0answers
116 views

RPI send/receive data with serialoport node.js

I have RS232 and want to send data to Rpi with node.js serialport. I want to show data in command line but it does not display. How can I improve my code to display a data in Rpi command line? This ...
0
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1answer
35 views

No input on FTDI / Serial on raspberry

I have one of these: http://www.amazon.com/gp/product/B00FEAMUOK/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1 Hooked it up as described in in the last post here: Running Headless - checking Boot ...
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0answers
277 views

Receive data from uart! Raspberry Pi mono c#

I'm new and I wanted your help please... From today, after updating libraries Mono C# on my Raspberry Pi Rev 2 Type B (wheezy), the communication via serial no longer works, it seems to me very ...
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0answers
222 views

Set default baud rate on /dev/ttyAMA0 and keep after reboot

I have a ITead Studio GPS attached to my RasPi Model B 2.0's UART serial port and it's specifications require baud rate to be set at 38400. I am using gpsd on Raspbian, which attempts to use baud ...
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3answers
1k views

How do I display an image file (PNG) in a simple window?

I've got a prototype I need to show for an RFID project. I've got the RFID (Parallax USB) working, and the sample Python script (my first) is displaying the ID of the card just like it's supposed ...
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2answers
54 views

More control of serial?

I am trying to control some really old proprietary hardware. I hooked a scope up and could determine that I need to send it essentially 21 bits in a row. It is a clock. so the fist seven are hours, ...
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0answers
106 views

Problems reading data with usb to serial adapter

I made application in Java that receives requests over HTTP and forwards them to the serial port, and back. I am using RXTX Java library and usb to serial port adapter. From my windows machine where ...
2
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1answer
588 views

Raspberry Pi and the USB to TTL Serial Cable on Mac

I've logged all my progress here Raspberry Pi and the USB to TTL Serial Cable on Mac (unfinished). screen /dev/cu.PL2303-000013FA 115200 Here's the errors that I'm getting It just hangs with a ...
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0answers
127 views

Making Raspberry pi talk to MyRio

I have a project where I need to use a NI MyRIO from NationalInstruments and a Raspberry Pi. I need to be able to send some data from some sensors on the RPi to MyRio and from MyRio to the RPi. The ...
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1answer
174 views

How to connect rs232 board to PI

How to connect this rs232 board to the PI?
2
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1answer
59 views

making serial connection to my electronic dictionary?

I've recently found that there's 4 terminals on my old electronic dictionary, each labeled as "/RP TXD RXD GND". The dictionary is more than 5 years old, and runs on 1xAA battery. Is there any chance ...
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0answers
209 views

external port forwarding to serial port

I have connected a device with the raspberry pi on serial port. I can talk to the device from within the raspberry pi (works fine). I am using a dongle to connect raspberry pi to the internet. I can ...
0
votes
1answer
1k views

Reading from serial port [loop]

I would like to read from the USB serial port from time to time in a loop. I can open the port and read data with: import serial ser = serial.Serial('/dev/ttyACM0', 9600) while 1 : ...
2
votes
0answers
459 views

How to control digital potentiometer using the SPI interface

I'm trying to control a digital potentiometer using RPi's SPI interface but for some reason it is failing, and I can't figure out why. I have successfully controled the potentiometer by manually ...
0
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2answers
194 views

Raspberry Pi used as a cheap serial to wlan converter

I want to use my raspberry pi as a serial to tcp converter. The raspberry pi should be a tcp-server that accept one tcp-client (because more connections would end in a complete mess in the serial ...
0
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1answer
115 views

Boot messages available over serial, however no login prompt :/

I've connected to the pi using a serial programmer for my arduino. I've connected using screen and when i boot my pi it spits out all the normal kernel boot messages. However, at the end of the ...
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1answer
120 views

Debugging problem with GPIO serial pins

I've been trying to run a port of a small RTOS called ChibiOS on my Raspberry Pi, and am having trouble with the serial communications. Specifically, when I use a UART connected at 3.3V to the GPIO ...
9
votes
1answer
463 views

What are the usage of extra available holes in model B

Despite some research on the web, I cannot find the options available from these "opportunity" holes on the Rpi. I probably do not use the proper words to identify them. What is the name for this ...
6
votes
3answers
474 views

How to install PiTFT and use to the GPIO for other usage (like serial console)

I am about to install PiTFT on a RPi model B. However, doing so, I will lose the GPIOs for other usage (like a serial cable cable, for instance). Is it possible to install a PiTFT and still have a ...
1
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2answers
351 views

UART/Serial communication w/ mono

I have a diplay w/ touch functionality, that communicates via either I2C, SPI or Serial (datasheet). I want to use it in a mono-application. The display has sufficient power and is connected ...
0
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0answers
80 views

Rasberry pi as wifi to serial ttl bridge

I have a Texecom intruder alarm system which comes with software that uses 5v tll for serial communications.Is there a way I can use the pi to interface the ttl com port to wifi so that the com port ...
0
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0answers
29 views

Problems using usb connection between arduino and raspberry pi [duplicate]

I have an arduino connected over usb with a raspberry. A python program ist sending a value over usb, the arduino receives it and turns the led on. The arduino is sending a analogue value from A0 to ...
1
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2answers
205 views

Serial Input for the Pi

I am trying to log slow serial data (about 40 bytes per minute at 9600 baud) on the Pi. I have a rough program using wiringSerial which only provides unbuffered serialGetchar I could write a ...
1
vote
3answers
396 views

RF transceiver and XBee module, both need UART?

I'm working an a home automation project, using a Raspberry Pi. What I want to do is connect an RF 433 MHz transmitter to control RF-controlled light switches, and a ZigBee/XBee module to connect to ...
0
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0answers
212 views

Real Time Acquiring of ECG waveform and display on a web page for Raspberry Pi

Is it possible to display ECG waveform on a web page in real time for Raspberry Pi?? If so, please tell me how?? The ECG waveform will be acquired by MSP430 and will be sent via the serial port to ...
2
votes
1answer
239 views

Possible to program an attiny2313 from gpio

I'm looking at the possibility of using an attiny2313 as a very simple controller chip, and I've used avrdude before with a parallel port to program one of these. Now I don't have a parallel port, ...
0
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2answers
219 views

Use RPi as a LIN Master to control slave nodes

I am trying to use the RPi as a LIN Master to communicate with a number of slave nodes on the LIN bus. I can send the correct bytes, starting with the sync byte of 0x55, and then the node ID, the ...
1
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2answers
642 views

Data loss (and/or corrupted) over serial USB connection to arduino

I'm trying to connect an Arduino to my RaspberryPi using USB serial cable. The goal is to be able to control a robotic arm using Firmata. I'm using node.js Johnny-Five module which allows me to ...
1
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0answers
138 views

How do I use the serial port on one RPi to talk to the serial port on a second RPi?

I have two RPis, identical model Bs, very recent. I want to communicate between them using their GPIO serial ports, /dev/ttyAMA0. I'm using a PiCobbler to TX to RX and RX to TX. I have: disabled ...
0
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0answers
266 views

raspberry pi serial communication

i think i have a strange problem??? when i try to communicate to PC (i used hyper terminal via uart to USB converter and logic level converter) there is no problem in sending and receiving data but ...
3
votes
3answers
13k views

Safest way to connect Raspberry Pi to Arduino Uno R3

I am working on a robot using an Arduino Uno R3 and I wanted to have the ability of controlling the Arduino wirelessly, like stopping the Arduino without having to pull the power-plug every time. I ...
0
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0answers
182 views

Serial port reading, misses data

I have connected a device which sends data over a serial port, through UART and a usb connector. On my laptop running ubuntu, I have written a C++ program to read this data and store it. It sends 5 ...
1
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0answers
71 views

When connecting with GNU Screen (patched version) RPi reprompts for password in kind of loop

I have a raspberry pi (running raspian) and want to connect to it with the Console Cable. I succeeded - and I tried twice, because it had worked before, but malfunctioned the second time (this is a ...