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Questions tagged [output]

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

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58
votes
12answers
301k views

Why is my audio (sound) output not working?

I can't get the audio running. I don't hear anything and can not play anything. Is there a solution to enable audio?
57
votes
7answers
239k views

Can a simple cable convert HDMI output to VGA?

One may buy a simple HDMI-to-VGA cable, or an HDMI-to-DVI cable. Example: on Amazon. However, my vague knowledge is that these cables only work for video cards that have special support for this ...
28
votes
3answers
8k views

How can I use the GPIO pins as digital outputs?

I've read that the Raspberry Pi has a number of input and output pins. How can I switch them? (from Python?) What voltage logic? Do I need pull-up or pull-down resistors? Do I need to switch the pins ...
20
votes
4answers
89k 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?
13
votes
4answers
15k views

How do I attach two monitors in a dual head configuration?

I'm considering buying a Raspberry Pi or compatible solution. My problem is that I could not find how to achieve a dual head configuration. I would like to attach two 1920x1200 displays by digital ...
11
votes
1answer
1k views

HDMI output display shows zits/interference

I received my Raspberry Pi today and tried the vanilla Debian squeeze distro and the OpenElec XBMC distro. What I noticed is the display was showing interference/zits similar to this: I checked my ...
10
votes
2answers
3k views

What are the pros and cons of connecting to a VGA monitor?

I can either get a passive RCA (Composite video) to VGA, an active RCA to VGA or an active HDMI to VGA, but which? What I want to know is: How does the quality compare between them (as in not ...
8
votes
10answers
42k views

No video on HDMI?

I just got my Raspberry Pi in the mail, and went to hook it up to my TV with an HDMI cable. I plugged in the cable (known to work with my cable box), a keyboard, and then power. A light comes on the ...
7
votes
4answers
20k 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 ...
6
votes
3answers
1k 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 ...
6
votes
2answers
28k 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 ...
6
votes
1answer
4k 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 ...
6
votes
2answers
1k views

How can I move the terminal?

For some reason my TV is cutting off about 4 or 5 characters from the screen of my Raspberry Pi. I am using Raspbian, but it occurred with Arch as well. Could it be that I have an HDMI to Component ...
5
votes
1answer
3k 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 ...
4
votes
1answer
917 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 ...
4
votes
2answers
3k 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 ...
3
votes
2answers
3k 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 ...
3
votes
3answers
1k 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 ...
3
votes
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 ...
3
votes
3answers
959 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'...
3
votes
1answer
376 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?
3
votes
2answers
171 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 ...
3
votes
1answer
4k views

Why RCA video doesn't provide colors

When I use the HDMI with my Raspberry Pi, all is ok. But when I use RCA output on my television, the screen is black/white. I have installed OpenELEC. I already changed of PERITEL-RCA adapter, I ...
3
votes
0answers
2k views

Can't set output to 4k 60hz on Pi 4

What I've tried: Setting "4Kp60 HDMI" I did this in the GUI config application and rebooted. Also tried disabling it and then enabling it in the config.txt and rebooted. Installing updates My ...
2
votes
1answer
61 views

No display output if I start raspberry pi and then start the monitor

If I switch on monitor first then switch on raspberry pi, it works fine. But if I switch on raspberry pi and then monitor or switch on both pi and monitor simultaneously no display is shown on monitor....
2
votes
1answer
128 views

see output from c++ program which was started by rc.local

is there a possibility to see output (f.e. std cout << ...) from my program which was started from rc.local script when i am logged into my Rpi via SSH?
2
votes
1answer
680 views

Can I make a GPIO into a 3v output?

I am working on setting up a Pi3 and have a screen attached its currently taking up all the 3.3V outputs. Is it possible for me to change the settings on say GPIO 16 (pin 36) to become a 3.3V output?
2
votes
2answers
2k views

raspbian-output-video-camera-to-3-5-lcd

I have a pi3, pi camera and kookye 3.5"lCD. On power up the OS is displayed on the 3.5 screen and the touchscreen works fine. When I run the camera it doesn't out put to the 3.5lcd. Likewise when I ...
2
votes
3answers
959 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 ...
2
votes
1answer
411 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 ...
2
votes
1answer
246 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-...
2
votes
1answer
23 views

Can I input/output an 8 bit parallel byte on eight pins simultaneously with Java?

Want to output 8 bits of parallel digital info on 8 pins of a 3B+ simultaneously. Input also. Java.
2
votes
3answers
976 views

Which type of GPIO has the raspberry pi?

Which type of output has the Raspberry pi 3 model B: sinking or sourcing? I want to connect SSR (Omron G3MB-202P) to Raspberry GPIO. This SSR has one NO contact (NO means "normally opened", i.e. it ...
2
votes
1answer
194 views

Gpio response is delayed

I'm using 8 of the GPIO to trigger relays for a Christmas light controller I am building. Everything works, and the GPIO output correctly, but 1 of the 7 GPIO pins output is delayed. Specifically it ...
2
votes
1answer
2k 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, ...
2
votes
1answer
429 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 ...
2
votes
0answers
258 views

How can I get my new Raspberry Pi 4B to output 1080i video

I finally got into the Pi world with a model 4B. I've updated it to Raspian/Buster and have the network working (wireless and wired - but just using wireless right now). I'm running it using VNC-...
2
votes
0answers
131 views

Output a fake TV Channel?

I recently went on a Disney cruise with my family and the TV had different channels that had films on a loop different channels were different categories. My wife and I REALLY liked this and wanted ...
2
votes
1answer
5k views

How to set a GPIO pin to default HIGH before setting it to output?

I have a raspberry pi connected to a Sainsmart 4-channel relay, where each relay is activated by a LOW signal. When I set a GPIO pin to output, it defaults to LOW, which of course activates the ...
2
votes
1answer
309 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
votes
1answer
638 views

Updating wheezy breaks Adafruit_CharLCD

So, just to try and keep the wheezy up to date I did an apt-get dist-upgrade and upgraded a couple of things, among which python. Now, when I try runing the example ./Adafruit_CharLCD.py I get no ...
1
vote
2answers
4k 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 ...
1
vote
2answers
875 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 ...
1
vote
2answers
57 views

Use Pi 3 B as external memory

I have a 3D Printer that I monitor with my Raspberry Pi, but I would like to connect the pi via USB to the printer so I can also use it as external storage for the printer as well. Is there a way I ...
1
vote
4answers
8k 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 ...
1
vote
2answers
730 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 ...
1
vote
1answer
127 views

128x64 OLED Display Issue [closed]

I have a cheap display I got from eBay connected to a Raspberry Pi B+. It has 4 pins (vcc, gnd, scl, sda). I followed the adafruit tutorial here but after setup, when I run a python example (any of ...
1
vote
1answer
103 views

Can I connect two Raspberry Pis to one 5" Display via an HDMI switch?

I have two Raspberry Pis running very different systems. I want to build an enclosure so that I can use a single 5" display (Amazon link) for both Pis. The setup I'm envisioning would rely on an ...
1
vote
1answer
2k 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/...
1
vote
2answers
4k 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, ...