Output refers to any PHYSICAL output from the Raspberry Pi. There are four main outputs: GPIO, HDMI, RCA and Audio.

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5V relay with Raspberry pi 3 Model B

I am working on home Automation Project (Voice Recognition to light On/Off) and yes i'm new to raspberry pi I have: [ http://www.amazon.in/Raspberry-Pi-64-bit-quad-core-Cortex/dp/B01CCOXV34?ie=...
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1answer
22 views

Use Raspberry Pi to evaluate sensors and control valves [closed]

I have a reaction system where input of different fluids should be controlled by certain parameters (pH, temperature...) that will be measured by sensors. I would like to evaluate the output of these ...
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2answers
25 views

Lost console log after running any app that takes over the screen (but not on SSH)

I am experiencing a very annoying issue and I don't know where to look for the reason. I would really appreciate some advice. I am using Raspbian Wheezy without GUI. I work mainly through SSH and it ...
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1answer
54 views

Why do I get an error message: 'Inappropriate ioctl for device' with I2C connection?

I am trying to connect a particle sensor to RPi via I2C. I have added dtparam=i2c_arm=on to the config.txt file and I have also un-blacklisted I2C. Using the Serial Python module, I have a script ...
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1answer
31 views

No output of commands on SSH console since Jessie was installed [closed]

when I for example execute the command poweroff, there is no output of the command visible. This happens with systemctl restart apache2 as well. I assume that system ouput is forwarded to somewhere. ...
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1answer
36 views

Use PHP to get callback from GPIO in

Is there a way to use PHP instead of python to detect callback from a GPIO pin? I see you can use shell_exec to execute a pin but not read output in real-time. An example is using a vibration sensor ...
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1answer
177 views

Composite video out not working

I just got a new Raspberry Pi 3 with wifi. It works fine using the HDMI output, but I need to use it for a composite video project on an old PAL tv. Just plugging it in with a composite video cable ...
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1answer
50 views

GPIO output working, but not?

Sorry for the confusing title, but here's my problem: I'm trying to test out a 2N2222 transistor as a switch for a higher current (for a 4WD motor) with the Raspberry Pi B+, and I'm trying to use one ...
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3answers
488 views

GPIO status after python code is closed

I intend to write a python script to change the status of GPIO pins. The code will receive arguments through sys.argv, change the state of some GPIO pins, and close afterward. My question is: Do the ...
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2answers
82 views

No video output on Raspberry Pi Zero, LED flashing

So I just got a Raspberry Pi Zero and an SD card with NOOBS pre-installed. I placed the SD card onto the RPi as well as a keyboard and a power supply. I plugged the RPi onto two different monitors, ...
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2answers
115 views

Using two Raspberry Pi to display an output on the monitor wirelessly

So I have a thesis where I made a podium that has a monitor attached to it with keyboard, router and speakers plus one of my Raspberry Pi. What I want is to project my first Raspberry Pi, that is ...
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1answer
82 views

Video output not centered on TV screen

I've had a few issues with HDMI. The first was no audio which I fixed. I suspect this other issue can be fixed in a similar fashion, but I am a super NOOB to all of this. Basically, the image on ...
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1answer
106 views

How to configure touchscreen for taking input and displaying output

I am making a control system project for factories where the motors and other appliances are supposed to be controlled via touchscreen. Is there a separate software in which the screen buttons has to ...
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1answer
101 views

wiringpi2 digitalWrite() has no effect

Hello fellow rpi lovers :-) I've encountered a very strange problem in my rpi-based project: I'm trying to control just one pin in OUTPUT mode so I use more or less such code: import wiringpi2 ...
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22 views

Input / output errors with Samba

This has been asked before, and on other sites, but I'm not sure there has ever been a definitive answer. I'm running Samba under Raspbian on RPi model B (original version -- not the recent upgrade). ...
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1answer
75 views

WiringPi - GPIO Output Vs PWM

So in the GPIO utility from WiringPi there is a command to change the mode of the GPIO pins. There is input mode, output mode and PWM mode. What is the difference between output mode and PWM mode? Is ...
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3answers
481 views

No video output for raspberry pi 2 model B with Jasper image

I just ordered my raspberry pi 2 model B. I am using a class 10 16Gb Sandisk SD card. I used Win32DiskImager to burn the pre compiled Disk image provided by Jasper. I connected the HDMI cable of my TV ...
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3answers
523 views

Why is Component not working for Raspberry Pi 2?

Note: It may not be working because of which cable I am using. So I have a Raspberry Pi 2 Model B and I want to connect it to a computer monitor that only takes composite video input. This is what I'...
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40 views

how many external expander chips can the 5v output of the raspberry pi power?

I'm currently using PCA9685 gpio PWM and DO chip expander which can be powered by 5V . I'm currently powering it by using the 5V output on the raspberry pi . I would like to know how many of these ...
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1answer
76 views

dc motors not responding to gpio's

I have a question. I've attached dc motors to gpio's and after running python program it won't turn. Attaching LED's would make them light very low. Attaching both of them to pin 1 or pin 2 would make ...
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2answers
725 views

Connect GPIO output to second Raspberry Pi input

Is it safe to connect a GPIO output to a GPIO input?? For example: Set the GPIO input to GPIO.PUD_UP and connect it to GPIO output. Then when the output is HIGH, then the input is logic 1, and when ...
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0answers
18 views

Is it possible to have two distinct video outputs or add a second HDMI port? [duplicate]

Is it possible to have two distinct video outputs or add a second HDMI port to the Raspberry Pi 2? I need to output two different programs on two different screens
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1answer
357 views

Redirect script output to /dev/tty1 and also capture output to file

I want to display text output on the console that is always displayed on a small screen ( Adafruit 2.8 Inch TFT ) on my Raspberry Pi. The following code works for showing that text output: cd /home/...
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1answer
385 views

Piezo wiring for Raspberry Pi

I have a piezo element that I got from a song card, it looks like the one at: https://www.sparkfun.com/products/10293, and I was wondering whether it was safe to connect to my raspberry pi without a ...
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2answers
2k views

How to control pi HDMI output from laptop via VNC

I have my pi plugged into a monitor with HDMI, and I want to use my laptop (running Ubuntu Linux) to control what it displays on the monitor through VNC. Currently, I can connect to the pi with VNC, ...
2
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1answer
159 views

GPIO does not work on reboot

I am using cron to start a program on reboot for my Raspberry Pi (running Raspbian). This program rings a bell hourly based on the current time. When the program is run manually using: sudo start-...
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1answer
247 views

What happens if ~3.3v is connected to a GPIO set as output?

If ~3.3v is connected to a GPIO set as output, would it damage anything?
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6answers
9k views

Raspberry Pi B+ not displaying screen

I recently bought Raspberry Pi B+ model, When I try to connect it with my LED TV(24 inch) using HDMI cable it's not displaying anything, showing as no signal. I try to connect basic connectivity ...
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2answers
226 views

RetroPie no HDMI output and “The disk you inserted was not readable by this computer”

I'm trying to install RetroPie onto my RP, it already worked with the OS it came with before trying this. I formatted the SD card altogether first and then after expanding the disk image using dd to ...
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2answers
14k views

The Composite Video on my Raspberry Pi isn't working

I run the commands /opt/vc/bin/tvservice -o<br> /opt/vc/bin/tvservice -c "PAL 4:3" and the screen changes from the default "no signal" screen to a black screen. This shows me that the ...
2
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1answer
989 views

I2Cs for temperature senors and multiple PWM outs

EDIT: Rewrite, this is why you don't write questions after not sleeping for two days (wait what day is it?) I have a whole bunch of 12V 4 pin (pwr, grnd, tach, pwm) fans I'd like to manually control, ...
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1answer
210 views

Minimal setup to output 30V through GPIO

I have a bell that works with a coil and when I put 30V (or more) on the coil the bell rings once. So now I want to be able to control that bell using my Raspi. I have a USB Charger for powering my ...
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200 views

Raspberry pi as CAMAC controller

Has anyone ever tried using raspberry pi as a digital input/output card for high frequency (more than 100 MHz) digital signal? I am thinking about building a CAMAC controller, the interface to PC (I ...
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1answer
693 views

LED board connected to raspberry pi

I've been searching for a little while for an LED light board for a while now that is easily compatible with the raspberry pi that I could use an arduino to my raspberry pi and then use my raspberry ...
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1answer
186 views

Raspberry PI and TV output

Today I bought my Raspberry Pi and want to build an ambilight for my TV. I know how to do this and will get it to work.. however, what I would like to know is if I can somehow get the output from my ...
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2answers
692 views

7 Segment display too dim with BCD to 7-segment latch/decoder/driver

I'm using 4 GPIO pins of my Raspberry Pi Model B 512MB Rev2.0 Board, to drive a single 7 segment LED display (1", Common Cathode, no part number on item) through a BCD to 7-segment latch/decoder/...
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1answer
2k views

REALLY force Raspberry Pi to send audio via HDMI

I wanted to use my Raspberry Pi with a very old video projector which was not capable of processing audio signals. So I bought an HDMI-audio-extractor (Ligawo 6518725 HDMI Extractor), as the PWM ...
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1answer
733 views

HDMI worked in another display, stopped working now on a LG!

My Raspberry Pi Model B Board works with RCA output, but do not work with HDMI, after it shows the splash screen. (curiously enough, it shows the splash screen, then a white screen with an option to ...
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2answers
605 views

Audio Output on RaspPI

I'm quite new to the DIY world but I wanna try to build a "smart clock". And I'm having trouble with making a choice on the audio output. So far, if I'm right i have 3 choice Use the on-board jack ...
2
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1answer
234 views

Small voltage on GPIO output

I tried using the wiringPi GPIO library just to test some basic IO, but when I tried to output HIGH on a pin (GPIO 25) the voltage only went from 0V to 0.03V, is this normal? If this is normal that'...
2
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1answer
264 views

Can output pin withstand any reverse voltage/current?

In my application I need to drive a stepper motor and depending on the speed of stepper motor the device that generates the drive signal is selectable. Out1 is from rpi for very low speeds and Out2 is ...
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1answer
1k views

No default output device -9996: playing sound through Django

I'm facing a problem with my Raspberry Pi while playing a sound through a web page. The page is built in with Django and is quite simple: you push on a button and a sound is played (a Python script is ...
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3answers
13k views

Creating an HDMI Pass-Through Connection

I would be very interested to know if anyone on here might be able to provide some insights into the feasibility and/or proper approach to add a HDMI input to the Raspberry Pi in an effort to allow ...
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2answers
2k views

Floating values from GPIO pin

I'm controlling a stepper motor through a stepper driver that is connected to the raspberry pi. Before I run a script to move the motor, the pi's pins have a "floating" value causing the motor to ...
8
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4answers
25k views

Use cellphone screen as monitor

This question is different from (Connect Pi to an old laptop screen) because I will use a cellphone and not a laptop. Would the Raspberry Pi support a LCD screen that is taken out of a cellphone?
2
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3answers
120 views

GPIO input and output levels

I have some basic questions, sorry, I have'nt found this. What are output levels of GPIO (Raspberry Pi) I mean the voltage ranges of low and high for input/output What is the maximum current that ...
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1answer
1k views

Text To Speech Select Output Device

I saw many tts engines, like festival, espeak, etc.. I wanted to know if any of these could select the output device, like an USB sound device. If it's possible, what the command line to make it ...
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2answers
9k views

No output on HDMI display, but it works on Video

I use my HDMI slot every time I plug my Raspberry Pi in. But I plugged it in the other day, and my monitor just said No Signal. So I plugged it in via Video, and it works. I just don't want to use ...
4
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2answers
2k views

Python Synth with Raspberry

I'm trying to create a synth using python with raspberry pi. I've written the code for manipulate the gpio input (i've modified the electronic of an old pianola and connected it to raspberry with the ...
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1answer
169 views

5-Bit to 32 Port Microcontrollers

Are there any 5-bit to 32 Port Chips, that would operate: Converting from 5-bit: inputs: 5 bit address 1 bit value 1 bit clock outputs: 32x 1 bit value (outputs toggled) Converting to 5-...